Audio T Verdict
The Wharfedale Diamond 12.4i is the model for anyone who likes what the Diamond range does but wants it delivered on a considerably bigger scale. Twin 150mm Klarity drivers, a 40.8-litre cabinet and bass extension down to 35Hz give this flagship floorstander genuine low-frequency authority, while its 89dB sensitivity and relatively benign 5O minimum impedance mean you do not need a monster amplifier simply to make it work.
What makes the 12.4i appealing is that Wharfedale has not chased scale at the expense of the qualities that make the smaller Diamond models so easy to enjoy. The same polypropylene and mica Klarity cone technology, carefully damped textile tweeter, sophisticated crossover components and resonance-controlled cabinet construction are all here, but with considerably more cabinet volume and cone area behind them.
For medium-to-large rooms, especially where rock, electronic, orchestral and other large-scale music make up a good part of the listening, the 12.4i is a lot of speaker for the money. The smaller 12.3i remains the more sensible option where space is tighter, but when the room can accommodate it the 12.4i delivers the fullest, deepest and most effortless performance in the Diamond 12i family.
Wharfedale Diamond 12.4i Floorstanding Speakers
Wharfedale Diamond 12.4i is the largest floorstanding loudspeaker in the Diamond 12i Series, combining twin 150mm Klarity drivers with a 25mm woven polyester dome tweeter in a substantial 40.8-litre bass-reflex cabinet.
Its 2.5-way configuration gives the speaker greater bass output and dynamic capability than the smaller models without requiring the complexity of a conventional three-way architecture. Both 150mm drivers contribute to the lower frequencies, while the upper unit continues through the midrange before handing over to the tweeter.
The refreshed Diamond 12i version retains the proven driver architecture of the original Diamond 12 Series while introducing revised bass-port tuning, refined internal damping, tighter production tolerances and a new selection of contemporary finishes.
- Flagship Diamond 12i floorstanding loudspeaker
- 2.5-way passive design
- Twin 150mm / 6.5-inch Klarity drivers
- Polypropylene and mica composite diaphragms
- 25mm woven polyester textile-dome tweeter
- High-loss tweeter damping coating
- Ribbed Klarity cone profiles
- Low-damping driver surrounds
- Aluminium compensation rings
- Glass-fibre and epoxy voice-coil formers
- Linkwitz-Riley crossover network
- Air-core crossover inductors
- Revised Diamond 12i bass-reflex port
- Improved low-frequency airflow control
- Revised internal cabinet damping
- Tighter drive-unit production tolerances
- Multilayer low-resonance cabinet
- Computer-modelled Intelligent Spot Bracing
- 40.8-litre internal cabinet volume
- 89dB sensitivity
- 30–200W recommended amplifier power
- 102dB peak SPL
- 8O compatible
- 5O minimum impedance
- 40Hz–20kHz frequency response
- 35Hz bass extension at -6dB
- 2.1kHz published crossover frequency
- Approximately 1150mm overall height
- 200mm cabinet width
- 22.4kg per speaker
- All Black finish
- Stone Grey finish
- Classic Walnut finish
The Flagship Diamond 12i Floorstander
Diamond 12.4i sits at the top of Wharfedale's current Diamond 12i loudspeaker range.
It takes the same fundamental engineering principles found in the smaller models and gives them a substantially larger acoustic platform, with twin 150mm drivers and more than 40 litres of internal cabinet volume.
The result is designed for customers who want greater low-frequency depth, more dynamic headroom and the ability to fill a larger room without leaving the relatively affordable Diamond family.
A Proper Full-Size Floorstander
At approximately 1.15 metres high once its floorstanding base arrangement is taken into account, Diamond 12.4i is noticeably more substantial than the 12.3i.
It remains only 200mm wide through the main cabinet, helping the front of the speaker retain relatively slim proportions despite the significant internal volume.
2.5-Way Driver Architecture
Diamond 12.4i is a 2.5-way loudspeaker.
This means the two 150mm drivers do not simply duplicate one another across the complete bass and midrange spectrum.
Both contribute to the low frequencies, while the upper driver continues further through the midrange before the 25mm tweeter takes over.
Why Use a 2.5-Way System?
A 2.5-way system allows Wharfedale to gain the benefits of twin bass drivers while keeping the crossover architecture relatively straightforward.
Advantages can include:
- Greater total bass-driver area
- Higher useful output
- Greater sensitivity
- More dynamic headroom
- Reduced low-frequency workload per driver
- Stronger room-filling ability
- A narrow cabinet compared with using one very large woofer
Twin 150mm Klarity Drivers
The Diamond 12.4i uses two 150mm or 6.5-inch Klarity drivers.
These are larger than the twin 130mm units used in the Diamond 12.3i and provide considerably greater effective cone area.
More Cone Area Means More Air Movement
Producing convincing low frequencies requires moving air.
Increasing the total radiating area allows the speaker to generate more acoustic output without requiring each individual cone to make such extreme excursions.
This contributes to the 12.4i's ability to sound bigger and more effortless when the music becomes demanding.
Wharfedale Klarity Cone Technology
Klarity is Wharfedale's proprietary composite diaphragm material used throughout the Diamond 12i range.
It blends polypropylene with mica to combine useful damping characteristics with greater structural rigidity.
Why Polypropylene?
Polypropylene has been used successfully in loudspeaker design for many years because it is relatively lightweight and naturally well damped.
Its smooth breakup behaviour can make it particularly suitable for drivers covering a wide range from bass into the midrange.
Why Add Mica?
Adding mica increases the stiffness of the material.
A stiffer diaphragm is better able to resist unwanted flexing as the voice coil accelerates and decelerates the cone.
The intention is to preserve the smooth character of polypropylene while gaining greater precision and lower distortion.
Ribbed Cone Profile
The cone profile itself incorporates structural ribs.
Wharfedale developed this geometry using profile simulation to increase rigidity without adding unnecessary moving mass.
Low-Damping Driver Surround
The flexible surround connecting each cone to its chassis uses relatively low mechanical damping.
Rather than relying on the suspension to restrain the driver excessively, Wharfedale uses the cone geometry and motor system to control its behaviour.
This approach is intended to maintain dynamic freedom and fast transient response.
Advanced Magnet Assemblies
Each mid/bass driver uses a carefully developed magnetic motor system with an aluminium compensation ring.
The compensation ring helps reduce the effects of inductance variation as the voice coil moves through the magnetic gap.
What Is Inductance Variation?
A loudspeaker driver is not an electrically static component.
Its electrical behaviour can change as the voice coil moves, potentially creating additional distortion as several musical frequencies are reproduced at once.
Reducing these variations helps the motor behave more consistently throughout its operating range.
Lower Intermodulation Distortion
Intermodulation distortion occurs when different frequencies interact within a non-linear system and create additional unwanted components.
This matters to a driver reproducing complex music where bass notes, vocals and instruments can occur simultaneously.
Wharfedale's motor-system design is intended to reduce these effects and preserve clarity as volume increases.
Glass-Fibre and Epoxy Voice-Coil Bobbins
The voice coils use a high-power composite former made from epoxy and glass fibre.
This offers greater structural strength and thermal stability than simpler former materials, helping the drivers remain controlled as temperatures rise during demanding playback.
25mm Textile-Dome Tweeter
High frequencies are handled by a 25mm woven polyester dome.
The tweeter diaphragm receives a high-loss damping coating intended to suppress undesirable resonances while maintaining smooth treble extension.
Why a Textile Dome?
A well-designed textile dome can combine low moving mass with useful internal damping.
This makes it possible to produce fast high-frequency response without relying on a rigid metal diaphragm.
Minimal Waveguide
Wharfedale uses a relatively flat tweeter faceplate with minimal waveguide shaping.
The design is intended to support broad dispersion and good off-axis performance rather than creating an unnecessarily narrow listening window.
Good for More Than One Listener
Broad treble dispersion is useful in a normal living room where several people may be sitting across a sofa rather than occupying one precisely defined seat.
Careful speaker positioning still matters, but the system does not need to be designed around a single tiny listening point.
2.1kHz Published Crossover Frequency
Wharfedale publishes a 2.1kHz crossover frequency for Diamond 12.4i.
The crossover controls the transition between the Klarity driver system and the textile tweeter so the three physical drive units behave as one coherent loudspeaker.
A Note on the 2.5-Way Crossover
Wharfedale's current technical specification publishes 2.1kHz as the crossover frequency but does not separately state the lower roll-off point of the supplementary bass driver. We would rather quote only the manufacturer's confirmed figure than introduce an unsupported crossover value.
Linkwitz-Riley Crossover Design
The Diamond 12i range uses sophisticated Linkwitz-Riley crossover networks.
The aim is to minimise unwanted phase disruption through the crossover region and maintain a smooth acoustic relationship between the drive units.
Air-Core Inductors
Air-core inductors are used within the crossover network.
Unlike an inductor wrapped around a magnetic core, an air-core component cannot suffer magnetic-core saturation as current increases.
This can help reduce another potential source of distortion during demanding passages.
Motor Structure Tuned to the Crossover
Air-core inductors typically have greater electrical resistance than some cheaper cored alternatives.
Wharfedale compensates for this within the magnet structure of the mid/bass drivers so bass speed and control are retained.
The Diamond 12i Refresh
Diamond 12.4i is not an entirely new loudspeaker replacing everything that was good about the original Diamond 12.4.
Wharfedale has deliberately taken an evolutionary approach.
What's New for Diamond 12.4i?
- Revised bass-reflex port geometry
- Improved airflow management
- Revised internal damping
- Tighter drive-unit production tolerances
- New contemporary cabinet finishes
Revised Bass-Reflex System
The bass-reflex port is one of the principal acoustic areas Wharfedale revisited for Diamond 12i.
The development programme examined both pressure and airflow through the port to identify opportunities for greater low-frequency control.
Computational Fluid Dynamics
Wharfedale used computational fluid dynamics to model the movement of air through the port structure.
This was combined with physical measurements and extensive listening rather than relying on computer simulation alone.
Laser Interferometry
Laser-based measurement was also used during development to study the physical behaviour of the loudspeaker system.
The engineering process was supported by both anechoic and real-room measurements.
Hundreds of Hours of Listening
Wharfedale says the engineering work was ultimately checked through extensive critical listening.
The aim was not simply a technically different port but one that produced worthwhile improvements when customers actually used the speakers in normal domestic rooms.
Better Bass Control
The revised system is intended to deliver more articulate and better-controlled bass while improving the transition between low and mid frequencies.
That is particularly worthwhile in the 12.4i because two large 150mm drivers and a 40.8-litre enclosure are capable of producing considerable low-frequency energy.
Real-Room Performance Matters
A speaker with generous bass capability can interact strongly with walls, corners and furniture.
Wharfedale's 12i development specifically considers the way the bass system behaves in realistic rooms rather than only under ideal laboratory conditions.
Bigger Bass Needs Better Control
With twin 150mm drivers and useful output down into the mid-30Hz region, the 12.4i can energise a room much more strongly than a compact Diamond. Positioning and amplifier control therefore become increasingly important as you move up the range.
Revised Internal Damping
Wharfedale has also refined the acoustic damping inside the cabinet.
Damping material absorbs and controls sound energy generated from the rear of the drive units, reducing internal reflections and helping the bass system behave as intended.
40.8-Litre Cabinet
Diamond 12.4i has an internal cabinet volume of 40.8 litres.
That is significantly larger than the 26.6-litre Diamond 12.3i enclosure and gives the twin 150mm drivers considerably more acoustic volume in which to operate.
Why Cabinet Volume Matters
Low-frequency reproduction is influenced by the relationship between the driver, enclosure and reflex tuning.
A larger cabinet does not automatically make a speaker better, but it gives the designer more scope to achieve deeper extension and useful output from appropriately sized bass drivers.
Multilayer Cabinet Construction
The enclosure uses a multilayer wood-fibre construction intended to reduce panel resonance.
Different materials and bonding layers are used to prevent the cabinet from behaving as one large, easily excited resonant surface.
Why Cabinet Resonance Matters
The drive units are supposed to reproduce the recording.
If the cabinet walls themselves flex significantly, they can radiate additional delayed energy that was never present in the electrical signal.
This can make bass less precise and obscure low-level detail.
Intelligent Spot Bracing
Inside the enclosure, Wharfedale uses computer-modelled bracing between opposing cabinet surfaces.
The positions are chosen to reduce panel movement without simply creating a rigid pathway that transfers vibration from one panel directly to another.
Especially Important in a Tall Cabinet
A floorstanding cabinet presents much larger panel areas than a compact bookshelf speaker.
Controlling those surfaces becomes increasingly important as cabinet dimensions and acoustic output increase.
35Hz Bass Extension
Diamond 12.4i is specified with:
- Frequency response: 40Hz–20kHz at +/-3dB
- Bass extension: 35Hz at -6dB
This is the deepest bass response in the Diamond 12i range.
What Does 35Hz Mean?
Thirty-five hertz reaches comfortably into the range occupied by bass guitar, kick drum, low piano notes and a significant amount of electronic bass.
For normal two-channel music listening, it means the 12.4i can reproduce a substantial proportion of the musical spectrum without assistance from a separate subwoofer.
Does Diamond 12.4i Need a Subwoofer?
For music, many systems will not need one.
A subwoofer is more relevant if you want:
- Very deep sub-30Hz electronic bass
- Full pipe-organ fundamentals
- Dedicated home cinema LFE
- Greater physical impact in a particularly large room
- To relieve the main speakers of very deep bass in an AV system
Start With the Speakers Alone
If your main priority is stereo music, set the Diamond 12.4i pair up properly before assuming a subwoofer is required.
Two 150mm drivers per cabinet and 35Hz extension already provide considerably more low-frequency capability than most conventional standmount speakers.
Don't Judge Bass by the Specification Alone
How 35Hz behaves in your room will depend heavily on speaker position and room dimensions. A well-positioned 12.4i can sound more controlled and convincing than a larger bass system placed badly.
89dB Sensitivity
Diamond 12.4i has a manufacturer-specified sensitivity of 89dB for 2.83V at one metre.
That is the same published sensitivity as Diamond 12.3i and makes the larger model relatively straightforward to drive despite its considerable physical size.
30–200W Recommended Amplifier Power
Wharfedale recommends amplifiers rated from 30 to 200 watts per channel.
This is the widest amplifier range in the Diamond 12i family and reflects the 12.4i's ability to work with sensible integrated amplifiers while also making use of substantially greater power where required.
Will a 30W Amplifier Drive Diamond 12.4i?
Thirty watts is within Wharfedale's published recommendation.
A good amplifier of this power can work in a modest room at sensible listening levels, but it would not be our first choice if the point of buying the largest Diamond is to exploit its full dynamic capability.
Is 50–80W Enough?
For many conventional living rooms, a well-designed amplifier in this region can be entirely successful.
Quality and current delivery matter considerably more than simply comparing the largest number printed in the specification.
Would 100W Be a Good Match?
Yes. A good-quality 100W amplifier provides useful headroom while remaining comfortably within Wharfedale's recommendation.
Can I Use 150W?
Yes.
A capable 150W amplifier can make good use of the 12.4i's dynamic range in a larger room, provided the system is used sensibly.
Can I Use 200W?
Wharfedale lists 200W as the top of the recommended amplifier range.
A 200W amplifier is not automatically forcing 200 watts into the speaker at all times; it simply has that additional potential output available when required.
A Better Amplifier Is About Control Too
Amplifier upgrades are not solely about reaching higher volume levels.
A stronger power supply and good current delivery can improve control of the twin 150mm drivers during normal listening, particularly when music contains complex bass information.
Give the 12.4i an Amplifier Worthy of It
You do not need enormous power, but this is the biggest and most capable Diamond 12i speaker. It is worth partnering it with an amplifier that has good control and enough headroom for the room and listening levels you actually use.
8O Compatible
Wharfedale describes Diamond 12.4i as 8O compatible.
The impedance drops to a minimum of 5O, which is relatively benign for a large twin-driver floorstander.
5O Minimum Impedance
The 5O minimum means the speaker should be compatible with a broad range of properly engineered modern amplifiers.
It is not a particularly low-impedance specialist design that automatically requires huge high-current power amplification.
102dB Peak SPL
The 12.4i is specified for a peak output of 102dB.
This matches the published peak figure for the 12.3i, but the larger model reaches deeper in the bass and has greater cabinet and driver capacity available to support large-scale reproduction.
What Size Room Suits Diamond 12.4i?
The 12.4i makes most sense in medium-to-large domestic listening rooms.
Its deep bass response, twin 150mm drivers and substantial enclosure need enough space to develop properly without excessive reinforcement from nearby room boundaries.
Can Diamond 12.4i Work in a Small Room?
Technically, yes, but that does not necessarily make it the right choice.
A very small room may strongly reinforce the speaker's considerable low-frequency output and leave too little physical space to optimise positioning.
In those circumstances, Diamond 12.3i or one of the standmount models may produce a more balanced result.
Bigger Is Not Automatically Better
Buying the largest model in a range only makes sense when the room and system can take advantage of it.
A smaller speaker positioned properly can easily outperform a larger model squeezed into an unsuitable location.
Can It Work in a Large Room?
Yes. This is one of the 12.4i's strongest applications.
The larger enclosure and twin 150mm drivers provide the extra scale required as listening distance and room volume increase.
Rear Bass-Reflex Port
Diamond 12.4i uses a rear-firing bass-reflex system.
The distance between the speaker and rear wall therefore has a significant influence on the final bass balance.
Give the Speaker Breathing Room
Do not automatically push the speaker tightly against a wall simply because it physically fits there.
Begin with useful space behind the enclosure and adjust the position according to the way the bass behaves in your room.
Closer to the Wall
Moving the speaker towards a solid rear wall normally increases bass reinforcement.
This can add useful weight in some rooms, but too much reinforcement can make bass heavy, slow or one-note.
Further Into the Room
If bass sounds overblown, moving the speakers further into the room is one of the first adjustments to make.
Even relatively small changes in distance can alter the response significantly.
Avoid Corners Where Practical
A room corner reinforces bass from multiple boundaries at the same time.
With a speaker capable of reaching to 35Hz, that reinforcement can easily become excessive.
Toe-In
Begin with both speakers angled slightly towards the normal listening position.
Then experiment with small adjustments.
- More toe-in can strengthen central-image focus
- Less toe-in can widen the apparent soundstage
- Excessive toe-in may narrow the useful listening area
- Keep left and right angles symmetrical where possible
Speaker Spacing
Try to position the speakers far enough apart to create a convincing stereo image without leaving a hole in the centre.
A useful starting point is to make the listening distance broadly similar to the distance between the left and right speakers.
Listen for the Centre Image
A well-positioned pair should allow a centrally recorded vocal to appear firmly between the speakers rather than sounding as though it comes independently from both cabinets.
Integrated Floorstanding Plinth
The tall cabinet is supported by a wider floorstanding plinth arrangement.
This provides greater stability than asking the narrow 200mm cabinet alone to provide the full contact area with the floor.
Adjustable Floor Spikes
The floor interface allows the speaker to be levelled and stabilised on suitable surfaces.
Each contact point should be adjusted so the speaker sits firmly without rocking.
Why Stability Matters
The drive units should move relative to a stable cabinet.
If the complete loudspeaker rocks backwards and forwards because one floor contact is uneven, some of that mechanical energy is being wasted moving the cabinet rather than the diaphragms.
Protect Hard Flooring
Metal floor spikes can mark wood, laminate, tile and other hard surfaces. Use suitable spike shoes or protective discs where required.
22.4kg Per Speaker
Each Diamond 12.4i weighs approximately 22.4kg.
That substantial weight comes from the large multilayer cabinet, two 150mm drivers, internal bracing and floorstanding base structure.
Use Two People When Unpacking
Each speaker weighs more than 22kg and needs to be manoeuvred while the floor hardware is fitted. Getting another person to help reduces the risk of damaging either the speaker or yourself.
Diamond 12.4i or Diamond 12.3i?
Wharfedale Diamond 12.3i is the smaller floorstander and the most important comparison for many customers.
Diamond 12.3i
- 2.5-way floorstander
- Twin 130mm Klarity drivers
- 26.6L cabinet
- 89dB sensitivity
- 30–150W recommended amplification
- 45Hz–20kHz frequency response
- 40Hz bass extension at -6dB
- 102dB peak SPL
- 180mm wide
- 19.5kg per speaker
Diamond 12.4i
- 2.5-way flagship floorstander
- Twin 150mm Klarity drivers
- 40.8L cabinet
- 89dB sensitivity
- 30–200W recommended amplification
- 40Hz–20kHz frequency response
- 35Hz bass extension at -6dB
- 102dB peak SPL
- 200mm wide
- 22.4kg per speaker
Where Does the 12.4i Gain Most?
The bigger model provides:
- Larger twin drivers
- More than 50% additional cabinet volume
- Five hertz deeper published bass extension
- A broader recommended amplifier range
- Greater physical scale
- More suitability for larger rooms
Both Have 89dB Sensitivity
Interestingly, both floorstanders share the same published 89dB sensitivity.
The 12.4i is therefore not simply about being easier to drive. Its advantages lie more in driver area, enclosure volume, bass depth and the scale of system it can support.
Both Are Rated to 102dB Peak SPL
The maximum published SPL is also the same.
This demonstrates why one specification should never be considered in isolation: the larger speaker's deeper bass and greater physical resources may still produce a different sense of authority even where the headline maximum level is identical.
Choose Diamond 12.3i If...
- Your room is medium-sized
- Space around the speaker is limited
- You want a slimmer 180mm cabinet
- You do not need the deepest Diamond bass response
- You have a lower-powered amplifier
- You want a less visually imposing floorstander
Choose Diamond 12.4i If...
- Your room is medium-to-large
- You want greater low-frequency depth
- You listen to bass-rich or large-scale music
- You sit further from the speakers
- You regularly listen at higher levels
- You have a more powerful amplifier
- You want the most capable speaker in the Diamond 12i range
Diamond 12.4i or Diamond 12.2i?
Diamond 12.2i is the largest standmount model in the range.
The two speakers are aimed at significantly different room and system requirements.
Diamond 12.2i
- Two-way standmount
- Single 150mm Klarity driver
- 11.8L cabinet
- 43Hz bass extension
- 20–120W amplification
- 8.2kg per speaker
- Requires suitable speaker stands
- Better suited to smaller spaces
Diamond 12.4i
- 2.5-way floorstander
- Twin 150mm Klarity drivers
- 40.8L cabinet
- 35Hz bass extension
- 30–200W amplification
- 22.4kg per speaker
- Integrated floorstanding support
- Designed for greater scale
A Standmount Doesn't Automatically Take Less Floor Space
A large standmount such as Diamond 12.2i still needs a substantial pair of stands.
Once the complete support is considered, the floor footprint can be surprisingly similar to a slim floorstanding speaker.
The choice should therefore be based on the acoustic presentation and room rather than assuming that standmount automatically means smaller.
Good for Rock?
Yes. This is one of the Diamond 12.4i's obvious strengths.
Twin 150mm drivers provide the cone area needed to give kick drums and bass guitar appropriate physical weight while the larger cabinet allows the system to reach considerably lower than the smaller Diamond models.
Good for Electronic Music?
The 35Hz bass extension makes the 12.4i particularly attractive for electronic music.
It will not reproduce every sub-bass frequency contained in modern production, but it reaches deep enough for a floorstander at this level to provide a convincing sense of weight without immediately requiring a subwoofer.
Good for Classical Music?
Yes.
Large orchestral works can demand both wide dynamic range and convincing low-frequency scale, making the greater acoustic capacity of the 12.4i particularly useful.
Good for Jazz?
Yes. Acoustic bass, drums, piano, brass and percussion all benefit from a loudspeaker that can combine low-frequency body with controlled midrange reproduction.
Good for Vocals?
Yes. The upper 150mm Klarity driver carries the important midrange region before handing over to the textile dome at the published 2.1kHz crossover point.
Good for Vinyl?
Diamond 12.4i can form the heart of a substantial turntable-based system.
As the speaker and amplifier improve, the quality of the turntable, cartridge and phono stage becomes increasingly important, so the complete system should be considered rather than simply choosing the largest loudspeaker.
Good for Streaming?
Yes. Pair the speakers with a capable streaming amplifier or use a separate network player with a conventional integrated amplifier.
The wide 30–200W recommendation leaves plenty of room for system development.
Good for CD?
Absolutely. A good CD player or transport and DAC can form an excellent source for a Diamond 12.4i system.
Can Diamond 12.4i Be Used With a Television?
Yes. Use an appropriate stereo amplifier, streaming amplifier or AV receiver offering HDMI ARC, HDMI eARC or optical connectivity as required.
Two Floorstanders or a Soundbar?
A soundbar remains considerably simpler.
A pair of properly positioned Diamond 12.4i speakers provides genuine physical stereo separation and is designed first and foremost for high-quality music reproduction.
If music matters at least as much as television convenience, the separate speaker system offers much greater scope for future upgrades.
Home Cinema Use
Diamond 12.4i can form the front left and right channels of a substantial matching Wharfedale home cinema system.
The current family also includes the Diamond 12.Ci Centre Speaker and smaller Diamond models suitable for surround duties.
Do You Still Need a Subwoofer for Home Cinema?
Yes if you want the AV system to reproduce a dedicated low-frequency effects channel properly.
Diamond 12.4i goes impressively deep for music, but a dedicated subwoofer is specifically engineered for frequencies below the normal operating range of conventional loudspeakers.
Use the AV Receiver's Bass Management
In a home cinema system, the AV receiver can direct the very lowest frequencies and LFE information towards a subwoofer rather than asking the Diamond floorstanders to handle everything themselves.
All Black Finish
All Black gives the speaker the most understated appearance, with a deep semi-matte treatment suited to contemporary hi-fi and home cinema systems.
Stone Grey Finish
Stone Grey provides a lighter, more contemporary alternative and can integrate particularly well into modern neutral interiors.
Classic Walnut Finish
Classic Walnut combines warmer wood tones with a contrasting semi-matte Black front baffle.
This creates a more traditional loudspeaker appearance without returning completely to the styling of older Diamond generations.
Dimensions
Wharfedale specifies:
- Main cabinet height: 1100mm
- Additional floorstanding base allowance: approximately 50mm
- Approximate overall height: 1150mm
- Width: 200mm
- Cabinet depth: 350mm
- Rear terminal allowance: 28mm
- Approximate overall depth: 378mm
- Weight: 22.4kg per speaker
Remember the Speaker Cable
The manufacturer's 378mm overall depth includes its 28mm terminal allowance.
Large banana plugs, spade connectors or stiff cable may still require a little extra practical space behind the speaker.
Speaker Connections
Diamond 12.4i connects to a conventional amplifier using passive speaker cable.
Make sure the left and right channels are wired with consistent polarity.
Correct Polarity
Positive on the amplifier should connect to positive on the corresponding loudspeaker, with negative connected to negative.
If one speaker is accidentally connected in reverse, bass output and central stereo imaging can be significantly weakened.
Switch the Amplifier Off Before Connecting
Always make or alter speaker connections with the amplifier switched off. Check that no loose strands of conductor can short between the positive and negative terminals.
Give the Speakers Time and Space
Do not make a final judgement on a large floorstander five minutes after pushing it against the nearest wall.
Speaker position has a major effect on bass, imaging and tonal balance, especially with a cabinet capable of reaching down to 35Hz.
Recommended Diamond 12.4i Setup Routine
- Unpack each 22.4kg loudspeaker carefully with another person assisting.
- Fit and adjust the supplied floor interface on a protected surface.
- Use suitable spike shoes or protectors on hard flooring where required.
- Place both speakers in broadly symmetrical positions.
- Begin with useful space between each rear port and the wall.
- Avoid pushing either speaker directly into a room corner.
- Keep the left and right speakers similar distances from nearby boundaries where practical.
- Start with a modest amount of toe-in towards the main listening seat.
- Check each speaker sits firmly without rocking.
- Switch the amplifier off before connecting speaker cable.
- Check left/right channel and positive/negative polarity carefully.
- Begin playback at a conservative volume.
- Use familiar vocal recordings to establish a strong centre image.
- Adjust toe-in gradually rather than making large changes.
- Play familiar bass-rich music.
- If the bass sounds thick or boomy, move the speakers further from walls and corners.
- If the system sounds too lightweight, experiment carefully with greater boundary reinforcement.
- Listen from the normal seating position rather than standing immediately in front of the speakers.
- Try a broad variety of recordings before settling on the final position.
- Only after positioning is optimised should you judge whether amplifier or cable changes are required.
- Add a subwoofer only if your music, room or home cinema requirements genuinely need deeper bass.
Who Are Diamond 12.4i Speakers For?
They are particularly well suited to:
- Medium-to-large listening rooms
- Customers wanting the flagship Diamond 12i model
- Rock and electronic music systems
- Classical and orchestral listening
- Jazz and large acoustic recordings
- Vinyl-based hi-fi systems
- Streaming systems with capable amplification
- Customers wanting deep bass without automatically adding a subwoofer
- Customers upgrading from smaller standmount speakers
- Customers choosing between Diamond 12.3i and 12.4i
- Music-focused television systems
- Larger Diamond home cinema installations
Who Should Consider Diamond 12.3i Instead?
The smaller floorstander may be a better fit if:
- Your room is medium-sized rather than large
- There is limited space around the loudspeakers
- You want a slimmer cabinet
- You do not need bass extension down into the mid-30Hz region
- You use a lower-powered amplifier
- You prefer a less visually dominant loudspeaker
- Your normal listening levels are moderate
Key Features
- Wharfedale Diamond 12.4i
- Flagship Diamond 12i speaker
- 2.5-way floorstanding design
- Passive loudspeaker
- Rear-ported bass reflex enclosure
- Twin 150mm Klarity drivers
- Twin 6.5-inch drivers
- Polypropylene and mica composite cones
- Ribbed cone profiles
- Low-damping surrounds
- Precision magnet assemblies
- Aluminium compensation rings
- Reduced inductance variation
- Glass-fibre epoxy voice-coil bobbins
- 25mm textile-dome tweeter
- Woven polyester treble diaphragm
- High-loss tweeter damping
- Minimal tweeter waveguide
- Broad off-axis dispersion
- Linkwitz-Riley crossover
- Air-core crossover inductors
- 2.1kHz published crossover
- Revised Diamond 12i bass port
- Improved airflow management
- Revised internal damping
- Tighter drive-unit tolerances
- Multilayer cabinet construction
- Computer-modelled Intelligent Spot Bracing
- 40.8L cabinet volume
- 89dB sensitivity
- 30–200W recommended amplification
- 102dB peak SPL
- 8O compatible
- 5O minimum impedance
- 40Hz–20kHz frequency response
- 35Hz bass extension at -6dB
- 1100mm main cabinet height
- Approx. 1150mm overall height
- 200mm width
- 350mm cabinet depth
- 378mm depth including terminals
- 22.4kg per speaker
- Floorstanding plinth
- Adjustable floor interface
- All Black finish
- Stone Grey finish
- Classic Walnut finish
- Suitable for medium-to-large rooms
- Suitable for vinyl systems
- Suitable for streaming systems
- Suitable for CD systems
- Suitable for television systems
- Suitable for matching Diamond home cinema systems
Frequently Asked Questions
Is the Wharfedale Diamond 12.4i current?
Yes. Diamond 12.4i remains the flagship floorstanding model in Wharfedale's current Diamond 12i Series.
Is Diamond 12.4i the replacement for Diamond 12.4?
Yes. It is the updated current-generation version of the Diamond 12.4.
What changed for Diamond 12i?
The updated range introduces revised bass-port tuning, refined airflow management, revised internal damping, tighter drive-unit production tolerances and new finishes.
Are the Klarity drivers completely new?
No. Wharfedale retained the established Klarity cone architecture because the original design remained strong, while tightening manufacturing tolerances for the refreshed series.
Is Diamond 12.4i the biggest Diamond 12i?
Yes. It is the largest conventional loudspeaker in the Diamond 12i family.
Is Diamond 12.4i two-way or three-way?
Neither exactly. Wharfedale classifies it as a 2.5-way loudspeaker.
What does 2.5-way mean?
Both 150mm drivers contribute to bass reproduction, while the upper driver continues further into the midrange before handing over to the tweeter.
How many drive units does it have?
Three: two 150mm Klarity drivers and one 25mm textile-dome tweeter.
What size are the main drivers?
150mm or 6.5 inches each.
What is Klarity?
Klarity is Wharfedale's composite cone material made from polypropylene and mica.
Why use polypropylene and mica together?
Polypropylene provides low mass and useful damping, while mica increases structural stiffness.
What size is the tweeter?
25mm or one inch.
What is the tweeter made from?
A woven polyester textile dome with a high-loss damping coating.
What is the crossover frequency?
Wharfedale currently publishes 2.1kHz.
What is the crossover to the lower bass driver?
Wharfedale does not publish a separate lower crossover figure in its current technical specification, so we would not quote one.
What type of crossover does it use?
The Diamond 12i range uses a Linkwitz-Riley crossover design with components including air-core inductors.
Is Diamond 12.4i rear ported?
Yes. It uses a rear-firing bass-reflex system.
What did Wharfedale change about the port?
The 12i development refined port geometry, airflow and internal damping to improve low-frequency control and articulation.
How low does Diamond 12.4i play?
Wharfedale specifies bass extension down to 35Hz at -6dB.
What is the normal frequency response?
40Hz to 20kHz within +/-3dB.
Is 35Hz deep for a floorstanding speaker?
It represents substantial low-frequency extension for a passive floorstander in this class and covers the vast majority of conventional musical bass content.
Does Diamond 12.4i need a subwoofer for music?
Not necessarily. Many music systems will find its 35Hz bass extension more than sufficient.
Would a subwoofer still help with electronic music?
It can if you want strong reproduction of frequencies substantially below the 12.4i's normal operating range.
Do I need a subwoofer for home cinema?
A dedicated subwoofer is recommended for proper reproduction of a film soundtrack's LFE channel and the deepest effects.
What is the sensitivity?
89dB for 2.83V measured at one metre.
What amplifier power does Wharfedale recommend?
30 to 200 watts per channel.
Will a 30W amplifier work?
Yes. It falls within Wharfedale's recommendation, although a larger room or high listening levels may justify considerably more available power.
Can I use a 50W amplifier?
Yes. A well-designed 50W amplifier can be a sensible partner at normal domestic volumes.
Can I use an 80W amplifier?
Yes.
Can I use a 100W amplifier?
Yes. A capable 100W amplifier provides useful headroom and sits comfortably inside the manufacturer's recommendation.
Can I use a 150W amplifier?
Yes.
Can I use a 200W amplifier?
Yes. Wharfedale lists 200W as the upper end of its recommended amplifier range.
Is a powerful amplifier dangerous?
Not when the system is used sensibly. Excessive playback levels can damage a loudspeaker with either excessive clean power or an underpowered amplifier driven heavily into clipping.
What is the impedance?
Wharfedale describes Diamond 12.4i as 8O compatible with a minimum impedance of 5O.
Is Diamond 12.4i difficult to drive?
Its 89dB sensitivity and 5O minimum impedance make it relatively amplifier-friendly for a large floorstander.
What is the maximum SPL?
Wharfedale specifies a peak SPL of 102dB.
How large is the cabinet?
The main enclosure is approximately 1100mm high, 200mm wide and 350mm deep.
How tall is it overall?
Wharfedale's specification adds approximately 50mm for the floorstanding base arrangement, giving around 1150mm overall.
What is the overall depth?
Approximately 378mm including Wharfedale's 28mm terminal allowance.
How much does each speaker weigh?
22.4kg.
Should I get someone to help me unpack them?
Yes. Each cabinet weighs more than 22kg and is substantially over one metre tall.
What is the internal cabinet volume?
40.8 litres.
Is Diamond 12.4i suitable for a small room?
It can work, but it is unlikely to be the most sensible Diamond model where space around the speakers is very limited.
What size room is best?
Medium-to-large domestic rooms are the natural application for a floorstander of this size and low-frequency capability.
Will Diamond 12.4i work in a large room?
Yes. Its cabinet volume and twin 150mm drivers make larger rooms one of its strongest applications within the Diamond range.
How close can it go to a wall?
There is no universal ideal because rooms differ. Start with useful breathing room behind the rear port and move the speaker according to the bass balance you hear.
What should I do if the bass is boomy?
Move the speakers further from rear walls and corners before changing other system components.
What if the bass is too light?
Experiment with slightly greater boundary reinforcement by moving the speakers closer to the rear wall in small increments.
Should Diamond 12.4i be toed in?
A modest inward angle towards the main listening position is a sensible starting point.
What is the difference between Diamond 12.3i and 12.4i?
Diamond 12.4i uses larger twin 150mm drivers, a 40.8-litre cabinet, deeper 35Hz bass extension and accepts up to 200W of recommended amplifier power.
Does Diamond 12.4i have higher sensitivity than 12.3i?
No. Both are currently specified at 89dB.
Does Diamond 12.4i play louder than 12.3i?
Wharfedale publishes the same 102dB peak SPL for both. The larger 12.4i's advantages lie primarily in driver size, cabinet volume, deeper bass extension and system scale.
Is 12.4i automatically better than 12.3i?
No. The 12.3i can be the better choice in a medium or smaller room where the larger speaker cannot be positioned properly.
What is the difference between Diamond 12.2i and 12.4i?
Diamond 12.2i is a two-way standmount using one 150mm driver, while the 12.4i is a much larger 2.5-way floorstander with two 150mm drivers and considerably deeper bass.
Do the 12.2i and 12.4i use the same size main driver?
Yes, both use 150mm Klarity drivers, but Diamond 12.4i uses two of them and a much larger enclosure.
Is Diamond 12.4i good for rock music?
Yes. The twin drivers and deep bass extension make it particularly well suited to rock recordings requiring weight and dynamic scale.
Is it good for electronic music?
Yes. Its 35Hz bass extension makes it the strongest Diamond 12i model for bass-heavy electronic music.
Is it good for jazz?
Yes. Its low-frequency extension works well with acoustic bass and drums while the Klarity midrange and textile tweeter handle the remainder of the ensemble.
Is it good for classical music?
Yes. The large cabinet and twin drivers are particularly helpful with orchestral scale and wider dynamic range.
Is Diamond 12.4i good for vinyl?
Yes. Partner it with a good turntable, phono stage and suitable amplifier.
Is it good for streaming?
Yes. Use a suitably capable streaming amplifier or a separate streamer and conventional amplifier.
Is it good for CD?
Yes.
Can I use Diamond 12.4i for television?
Yes. Use suitable stereo or AV amplification with the required television connection.
Can it be used for home cinema?
Yes. Diamond 12.4i can serve as the main front left and right channels in a matching Diamond surround system.
Is there a matching centre speaker?
Yes. Wharfedale produces the Diamond 12.Ci Centre Speaker.
What finishes are available?
The current Diamond 12i range is available in All Black, Stone Grey and Classic Walnut with a contrasting semi-matte Black baffle.
Are Diamond 12.4i active speakers?
No. They are passive speakers and need an external amplifier.
Do they have Bluetooth?
No. Bluetooth would need to come from the amplifier or source.
Do they have WiFi?
No.
Do the speakers plug into the mains?
No. The speakers themselves receive electrical power from the connected amplifier through the speaker cables.
Should I audition Diamond 12.4i before buying?
Yes. It is particularly worthwhile comparing it directly with Diamond 12.3i because the larger speaker is only an advantage when the room and system can make proper use of it.
Related Wharfedale Products and Audio T Guides
Why Buy Wharfedale Diamond 12.4i From Audio T?
The biggest speaker in a range is not automatically the right speaker for every customer. Diamond 12.4i can produce considerably more low-frequency energy than the smaller Diamond models, so matching it properly to the room and amplifier is especially important.
Audio T can demonstrate the Diamond 12.4i with suitable amplification, compare it directly with the more compact 12.3i and help optimise speaker position, cabling and system matching so you get the benefits of the larger speaker without overpowering the room.
- In-store Wharfedale demonstrations
- Diamond 12.4i demonstrations
- Diamond 12.3i versus 12.4i comparisons
- Standmount versus floorstander comparisons
- Amplifier matching advice
- Streaming amplifier matching
- Turntable system matching
- Speaker positioning guidance
- Room-size matching
- Toe-in and stereo-imaging setup
- Bass optimisation advice
- Floor spike and protection advice
- Speaker cable advice
- Subwoofer matching
- Diamond home cinema system planning
- Part-exchange options
- Home demonstration options where available
- Ongoing after-sales support
Contact your local Audio T store to arrange a demonstration of the Wharfedale Diamond 12.4i or compare it with other speakers in the Diamond range.