Audio T Verdict
The centre speaker can be one of the hardest-working loudspeakers in a home cinema system. Dialogue, voices and a great deal of the action anchored to the television screen are commonly routed through the centre channel, so getting this speaker right can make just as much difference as choosing impressive front floorstanders. The Wharfedale Diamond 12.Ci is designed specifically for that job.
Its twin 130mm Klarity drivers give the 12.Ci enough radiating area to sound suitably substantial, while the centrally positioned 25mm textile-dome tweeter handles high-frequency detail. Just as importantly, it uses the same fundamental driver and crossover technology as the rest of the Diamond 12i family, helping it integrate naturally with Diamond 12.0i, 12.1i, 12.2i, 12.3i and 12.4i speakers in a complete surround system.
The closed-box cabinet is a particularly sensible choice for a centre channel because these speakers often need to sit beneath a television, inside furniture or relatively close to a wall. There is no rear reflex port needing space to breathe, although positioning still matters. Place it centrally, keep the front of the speaker clear of obstructions and use the supplied feet to angle it towards ear level when necessary. Set up properly, the 12.Ci gives a Diamond home cinema system a strong, coherent anchor across the front soundstage.
Wharfedale Diamond 12.Ci Centre Speaker
The Wharfedale Diamond 12.Ci is the dedicated centre-channel loudspeaker for the current Diamond 12i range.
Designed primarily for home cinema, it uses two 130mm Klarity composite drivers together with a 25mm woven polyester dome tweeter in a compact closed-box enclosure.
Its role is to provide a focused acoustic anchor around the television screen, reproducing dialogue, vocals and other centrally placed soundtrack information while maintaining a consistent character with the rest of a Wharfedale Diamond 12i surround system.
- Dedicated Diamond 12i centre-channel speaker
- Two-way passive design
- Closed-box acoustic enclosure
- Twin 130mm / 5-inch Klarity drivers
- Polypropylene and mica composite cones
- 25mm / 1-inch woven polyester dome tweeter
- High-loss tweeter damping coating
- Low-damping mid/bass surrounds
- Ribbed Klarity cone profiles
- Precision magnet assemblies
- Aluminium compensation rings
- Glass-fibre and epoxy voice-coil formers
- Linkwitz-Riley crossover design
- Air-core crossover inductors
- Computer-modelled internal bracing
- Multilayer low-resonance cabinet construction
- Revised Diamond 12i internal damping
- Tighter current-generation production tolerances
- 90dB sensitivity
- 20–120W recommended amplifier power
- 96dB peak SPL
- 8O compatible
- 4O minimum impedance
- 90Hz–20kHz frequency response
- 80Hz bass extension at -6dB
- 2.2kHz crossover frequency
- 8.7-litre cabinet volume
- 180mm height
- 480mm width
- 208mm overall depth including terminals
- 8.5kg weight
- Supplied mounting feet allow useful vertical angling
- All Black finish
- Stone Grey finish
- Classic Walnut with Black baffle
Why the Centre Speaker Matters
In a multichannel cinema soundtrack, the centre is not simply an extra speaker filling the space between the left and right channels.
It provides a physical acoustic source directly associated with the picture and commonly carries dialogue, voices and other sounds intended to remain anchored to the screen.
This becomes particularly important for anyone sitting away from the exact centre of the room.
Why Not Just Use the Left and Right Speakers?
A conventional stereo pair can create a convincing phantom centre image for someone sitting exactly between the speakers.
Move several seats to one side, however, and that phantom image naturally begins to pull towards the nearer loudspeaker.
A physical centre speaker helps keep centrally mixed soundtrack information tied more consistently to the television for a wider range of seating positions.
Don't Treat the Centre as an Afterthought
If films, television and drama are important to you, spending the entire speaker budget on the front left and right channels while using a tiny unrelated centre can undermine the complete system. Matching the front three speakers is one of the most useful foundations for a coherent home cinema.
Designed for the Diamond 12i Family
Diamond 12.Ci is designed to complement the current Diamond 12i stereo speakers.
That includes:
Why Matching the Front Three Speakers Helps
Film sound frequently moves across the front of the room.
A vehicle might travel from left to right, a character can move across the screen while speaking or a musical score can span all three front channels.
Using loudspeakers based around related driver materials and design principles helps those transitions sound more consistent than combining completely unrelated speaker families.
Twin 130mm Klarity Drivers
The Diamond 12.Ci uses two 130mm or five-inch Klarity composite drivers.
The twin-driver arrangement provides considerably more radiating area than a single small mid/bass driver while retaining a relatively low 180mm cabinet height suitable for placement beneath a television.
Why Two Mid/Bass Drivers?
A centre speaker needs to balance several competing requirements.
It should be low enough to fit beneath a television but substantial enough to reproduce voices and cinematic effects with believable body.
Using two 130mm drivers allows Wharfedale to gain useful cone area without making the cabinet excessively tall.
Klarity Cone Technology
The drivers use Wharfedale's Klarity diaphragm material, a composite blend of polypropylene and mica.
It is the same fundamental cone technology used across the Diamond 12i range.
Why Use Polypropylene?
Polypropylene offers low moving mass and useful natural damping.
It has been widely used in loudspeaker engineering because its controlled material behaviour can help avoid sharp resonant colourations.
Why Add Mica?
Mica increases the stiffness of the polypropylene mixture.
A stiffer cone is better able to resist unwanted flexing as it moves, helping more of the diaphragm behave as one controlled surface.
The aim is to combine useful damping with the rigidity needed for clean transient response and low distortion.
Why This Matters for Dialogue
Human speech contains a complex combination of fundamentals, harmonics, consonants and transient information.
A driver covering the vocal region needs to reproduce those changes cleanly without adding obvious resonances of its own.
The centre channel also has to remain composed when dialogue is accompanied by music, effects and other soundtrack information at the same time.
Ribbed Klarity Cone Profile
The cone shape incorporates structural ribbing to increase rigidity.
Wharfedale developed the profile through simulation so the diaphragm could maintain controlled movement without relying on an excessively restrictive surround.
Low-Damping Surround
The flexible suspension around each Klarity cone uses relatively low mechanical damping.
This allows the diaphragm to react freely to changes in the soundtrack while the motor and cone construction provide the necessary control.
Advanced Magnet Assemblies
Each 130mm driver uses a precision magnetic motor system with an aluminium compensation ring.
This is designed to reduce variations in inductance as the voice coil moves.
Why Inductance Control Matters
A moving loudspeaker driver is not an electrically static component.
Changes in its electrical behaviour can introduce additional distortion, particularly when several frequencies need to be reproduced simultaneously.
Controlling these variations helps the driver follow the amplifier signal more consistently.
Lower Intermodulation Distortion
Wharfedale says its motor-system design helps reduce intermodulation distortion.
That matters in a centre channel because a soundtrack can ask the same speaker to reproduce speech, music and effects at the same time.
Glass-Fibre and Epoxy Voice-Coil Bobbins
The voice coils are wound onto high-power epoxy and glass-fibre formers.
These provide useful thermal stability and structural strength as electrical power is converted into movement and heat.
25mm Textile-Dome Tweeter
High frequencies are handled by a 25mm woven polyester dome.
The diaphragm receives a high-loss damping coating intended to suppress unwanted resonances and maintain smooth treble behaviour.
Why Treble Matters for Dialogue
Voice intelligibility does not depend only on the midrange.
Higher-frequency information contributes to consonants, articulation and the subtle details that help speech remain understandable against a busy soundtrack.
The tweeter also handles high-frequency effects, ambience and music routed through the centre channel.
Minimal Waveguide Design
The tweeter faceplate uses a relatively flat profile with minimal waveguide loading.
Wharfedale's intention is broad dispersion and useful off-axis performance rather than an extremely narrow high-frequency listening window.
Useful for Wider Seating Areas
A home cinema is rarely used by one person sitting permanently in a single central seat.
Good dispersion helps preserve a useful tonal balance for people sitting across a sofa or wider seating area.
2.2kHz Crossover Frequency
The twin Klarity drivers hand over to the 25mm tweeter through a crossover centred at 2.2kHz.
The crossover determines how the separate drive units combine through this important region.
Linkwitz-Riley Crossover
Diamond 12i uses a Linkwitz-Riley crossover topology selected to provide controlled acoustic integration between the drive units.
The network is designed to minimise unwanted phase disturbance through the crossover region.
Air-Core Inductors
Wharfedale uses air-core inductors within the crossover network.
Because they contain no magnetic core, they avoid magnetic saturation as current increases.
This is a relatively sophisticated component choice for a centre speaker at this price point.
Closed-Box Enclosure
Unlike the bass-reflex Diamond stereo speakers, Diamond 12.Ci uses a closed-box or sealed cabinet.
There is no reflex port at the front or rear of the enclosure.
Why Use a Closed-Box Centre Speaker?
A centre speaker often needs to sit closer to a television, wall or equipment cabinet than the left and right speakers.
A sealed enclosure avoids the need to maintain clearance around a bass-reflex opening and can make practical placement considerably easier.
No Rear Port to Block
This can be especially useful when the centre needs to sit on a shelf beneath the television.
There is no rear port that needs an unobstructed airflow path.
Closed-Box Does Not Mean Placement Doesn't Matter
Although there is no reflex port to obstruct, nearby shelves, cabinet edges, walls and the television itself can still affect the sound through reflections and boundary reinforcement. Position the speaker carefully rather than simply pushing it as far back into furniture as possible.
90Hz–20kHz Frequency Response
Wharfedale specifies the Diamond 12.Ci from 90Hz to 20kHz within +/-3dB.
Usable low-frequency output extends to 80Hz at the manufacturer's -6dB reference point.
Why Doesn't a Centre Speaker Need 35Hz Bass?
A conventional surround system uses bass management to distribute low-frequency information between the loudspeakers and subwoofer according to their capabilities.
The centre speaker therefore does not need to reproduce the deepest bass in the soundtrack in order to perform its primary role effectively.
Use an AV Receiver's Bass Management
A compatible AV receiver or processor can redirect frequencies below the centre speaker's useful operating range towards a suitable subwoofer.
This allows Diamond 12.Ci to concentrate on the range it is designed to reproduce while the subwoofer handles deeper bass.
Should the Centre Be Set to Large or Small?
Follow the setup system and guidance provided by your AV receiver rather than treating the words "large" and "small" as literal descriptions of cabinet size.
In home cinema terminology, these settings normally relate to bass management rather than whether the physical loudspeaker looks large.
What Crossover Setting Should I Use?
The optimum AV crossover depends on the receiver, subwoofer, room and the way the complete speaker system measures at the listening position.
Diamond 12.Ci is specified to 80Hz at -6dB, but that does not mean every room should automatically use one exact electronic crossover setting.
Run the AV receiver's room-calibration system where available, inspect the result and adjust if necessary.
Let the Subwoofer Do What It Is Good At
Routing the deepest bass away from the centre speaker can increase useful headroom for dialogue and effects. A good home cinema setup is about sharing the workload intelligently rather than forcing every speaker to reproduce the entire frequency range.
90dB Sensitivity
Diamond 12.Ci has a sensitivity of 90dB for 2.83V measured at one metre.
That is slightly higher than the Diamond 12i stereo models and is useful in a centre speaker, which may need to reproduce substantial dialogue and effects at realistic cinema levels.
20–120W Recommended Amplifier Power
Wharfedale recommends amplification between 20 and 120 watts.
In practical home cinema use, the AV receiver needs enough clean power for the complete speaker system rather than the centre being considered in isolation.
Can a 20W Amplifier Drive Diamond 12.Ci?
Twenty watts falls within Wharfedale's published recommendation.
However, multichannel cinema places different demands on amplification than simple low-level stereo listening, so available headroom across all channels remains important.
Can I Use 50–100W?
Yes. That sits comfortably within Wharfedale's recommended range and covers many conventional AV receivers.
Can I Use 120W?
Yes. Wharfedale gives 120W as the upper end of its recommended amplifier range.
8O Compatible
Wharfedale describes Diamond 12.Ci as 8O compatible.
The impedance reaches a minimum of 4O, so the chosen AV receiver should be designed to drive conventional modern passive loudspeakers confidently.
4O Minimum Impedance
A 4O minimum is not unusual in modern loudspeakers, but it does mean the amplifier's current capability matters as well as the headline wattage number.
96dB Peak SPL
Wharfedale specifies a peak sound-pressure level of 96dB.
This gives the 12.Ci useful output capability for normal domestic home cinema systems without requiring an unusually large cabinet.
8.7-Litre Cabinet
The sealed enclosure has an internal volume of 8.7 litres.
This gives the two 130mm drivers sufficient working volume while keeping the physical cabinet low enough for practical television installations.
Multilayer Cabinet Construction
Diamond 12i cabinets use a multilayer construction intended to reduce panel resonances.
The properties of the board layers and even the adhesive between them form part of Wharfedale's approach to controlling unwanted vibration.
Why Cabinet Resonance Matters for a Centre
Speech is extremely familiar to the human ear.
Unwanted cabinet resonances can colour voices and make dialogue sound boxy or less natural.
Keeping the enclosure controlled helps the drive units remain the principal source of sound.
Intelligent Spot Bracing
Wharfedale uses computer-modelled bracing between selected internal cabinet surfaces.
The aim is to reduce panel movement without simply transferring unwanted vibration from one side of the cabinet to another.
Diamond 12i Refinements
The Diamond 12i series is an evolution of the original Diamond 12 range rather than a complete reinvention.
For Diamond 12.Ci, the most relevant current-generation changes include:
- Revised internal damping
- Tighter drive-unit production tolerances
- Updated cabinet finishes
- Retention of the established Klarity driver architecture
- Retention of the proven textile-dome tweeter
Diamond 12.Ci Is Not Bass Reflex
Wharfedale discusses revised bass-port tuning across the wider Diamond 12i range, but the Diamond 12.Ci itself is explicitly specified as a closed-box speaker. There is no bass-reflex port on this model.
Diamond 12.Ci Versus the Original Diamond 12.C
The current Diamond 12.Ci is an evolution of the original Diamond 12.C rather than a fundamentally different centre-channel design.
The headline acoustic specification remains very similar, including:
- Twin 130mm drivers
- 25mm textile-dome tweeter
- Closed-box enclosure
- 90dB sensitivity
- 20–120W recommended amplification
- 90Hz–20kHz response
- 80Hz bass extension
- 2.2kHz crossover
- 8.5kg cabinet weight
Do Existing Diamond 12.C Owners Need to Upgrade?
Not automatically.
The 12.Ci refresh concentrates on incremental refinement and current styling rather than making the original centre suddenly obsolete.
If you already own a properly functioning Diamond 12.C within a Diamond 12 home cinema system, replacing it simply because the new model carries an "i" is unlikely to be the first upgrade we would recommend.
When Does Diamond 12.Ci Make Most Sense?
It is the natural current choice if you are:
- Building a new Diamond 12i cinema system
- Adding a centre channel to an existing Diamond-based setup
- Replacing a much smaller or unrelated centre speaker
- Moving from stereo to multichannel home cinema
- Matching new Diamond 12i front speakers
Position the Centre Directly With the Screen
Wharfedale recommends placing the centre speaker centrally between the main left and right speakers and close to the television.
It can be positioned either above or below the screen.
Below the Television
This is the most common arrangement in modern rooms.
The speaker should sit on a stable, flat surface and should ideally be aimed towards the listeners rather than firing into their knees simply because the TV cabinet is low.
Supplied Mounting Feet
Wharfedale supplies a set of mounting feet with its centre-channel speaker.
Different combinations of the larger and smaller feet can be used to change the vertical angle of the cabinet.
Angle the Speaker Towards Ear Level
If Diamond 12.Ci sits substantially below the television, use the supplied feet to angle it upwards towards the main seating position.
This is a much better approach than assuming a horizontal centre should always sit perfectly flat regardless of its height.
Centre Speaker Above the TV
If the 12.Ci is positioned above the television, aim it down towards the listening position where practical.
Wharfedale also recommends moving the speaker forwards so the grille sits slightly in front of the screen and the supporting cabinet.
Why Bring the Front Edge Forward?
Placing the speaker deep inside a shelf or behind a large cabinet edge introduces nearby reflective surfaces directly in front of the drivers.
Keeping the front of the speaker clear gives its output a more direct path into the room.
Don't Hide the Centre Deep Inside Furniture
A sealed cabinet makes placement easier, but it does not make the speaker immune to surrounding furniture. Where possible, keep the grille near the front edge of the shelf or cabinet rather than burying it several inches inside an enclosed space.
Use a Stable Flat Surface
Wharfedale specifically recommends a stable surface so the cabinet cannot move at higher playback levels.
At 8.5kg, Diamond 12.Ci is substantial enough that the furniture beneath it should be properly capable of supporting the speaker.
Do Not Balance It on the Television
Modern flat-panel televisions are generally not intended to support an 8.5kg loudspeaker.
Use suitable furniture, a shelf or a purpose-designed support arrangement rather than resting the centre on the television chassis.
Make Sure It Fits Beneath the Screen
Diamond 12.Ci measures:
- Height: 180mm
- Width: 480mm
- Cabinet depth: 180mm
- Terminal allowance: 28mm
- Overall depth: approximately 208mm
- Weight: 8.5kg
Check TV Stand Clearance
If your television sits on its own tabletop stand rather than being wall mounted, measure the distance between the furniture surface and the bottom of the picture before buying.
The 180mm cabinet height must fit without obscuring the screen or remote-control receiver.
Wall-Mounted TVs Make Centre Placement Easier
A wall-mounted screen can provide greater freedom to position the centre at an appropriate height beneath it.
The TV can often be mounted high enough to leave sufficient clearance for the 12.Ci while keeping the picture at a comfortable viewing position.
Can Diamond 12.Ci Go Inside an AV Cabinet?
Yes, provided the opening is large enough, the shelf is strong and the front of the speaker is not significantly recessed.
The sealed cabinet makes this more practical than a centre speaker relying on a rear-facing reflex port.
Allow Space for Speaker Cable
Although the cabinet itself is 180mm deep, Wharfedale adds approximately 28mm for the rear terminals.
Allow further practical room if you use large plugs or stiff speaker cable.
Speaker Cable Connections
Diamond 12.Ci uses conventional screw terminals and connects to the centre-channel output of an AV amplifier or receiver using speaker cable.
Correct Polarity Matters
Connect the positive terminal on the AV receiver to positive on the centre speaker and negative to negative.
Maintaining correct polarity helps the centre integrate properly with the left and right front speakers.
Switch the AV Receiver Off First
Make all speaker-cable connections with the amplifier or AV receiver switched off. Make sure there are no loose strands of bare wire capable of shorting between adjacent terminals.
Match Centre Level to the Rest of the System
Modern AV receivers normally provide individual channel-level adjustment.
Use the receiver's room-calibration system where available, or manually balance the channels using the receiver's setup procedure.
Don't Simply Turn the Centre Up Excessively
If dialogue is difficult to understand, adding several decibels to the centre channel may help in some circumstances, but it is worth checking the underlying system first.
Look at:
- Centre-speaker angle
- Whether the speaker is recessed into furniture
- AV crossover settings
- Channel distance and delay settings
- Room correction
- Subwoofer integration
- The soundtrack's own dialogue mix
Distance and Delay Settings
The AV receiver needs to know the acoustic relationship between each speaker and the listening position.
Automatic calibration systems usually measure this for you.
If configuring the receiver manually, follow its instructions carefully so sound from the centre, front, surround and subwoofer channels arrives coherently.
Diamond 12.Ci With Diamond 12.3i
Diamond 12.3i makes an especially logical front left/right partner in a medium-sized room.
The 12.3i provides greater low-frequency scale from its floorstanding cabinet while the 12.Ci anchors dialogue and centre-screen information.
Diamond 12.Ci With Diamond 12.4i
Diamond 12.4i is the flagship floorstander and suits larger installations.
The 12.Ci remains the corresponding Diamond 12i centre rather than requiring a completely different speaker simply because the main pair is larger.
Diamond 12.Ci With Diamond 12.1i
Diamond 12.1i can create a compact and relatively affordable front speaker system.
This combination is particularly practical in smaller living rooms where large floorstanders would be unnecessary.
Diamond 12.Ci With Diamond 12.2i
Diamond 12.2i offers much deeper bass than 12.1i while retaining standmount proportions.
Pairing it with the 12.Ci can create a substantial front soundstage without using floorstanding speakers.
Diamond 12.Ci With Diamond 12.0i
Diamond 12.0i can work particularly well as compact surround channels, while 12.Ci remains at the centre of the front stage.
Can I Mix Diamond 12i Speaker Sizes?
Yes.
One of the purposes of a speaker range is to let you choose cabinet sizes appropriate to each position while retaining related acoustic design.
A typical system could use larger floorstanders at the front, the 12.Ci in the centre and smaller Diamond speakers at the rear.
Do All Five Speakers Need to Be Identical?
No.
Using exactly the same speaker at every position can be acoustically attractive, but it is rarely practical in a living room.
A properly matched family of speakers provides a sensible compromise between consistency and practical installation.
5.1 Home Cinema
A conventional 5.1 Diamond system might combine:
- Diamond 12.3i or 12.4i front left and right
- Diamond 12.Ci centre
- Diamond 12.0i, 12.1i or another suitable Diamond model for surrounds
- A powered subwoofer for the LFE channel
7.1 Home Cinema
A compatible AV receiver can expand the system with additional rear-surround channels.
The exact speaker arrangement should follow the receiver's supported configuration and the geometry of the room.
Dolby Atmos Systems
The wider Diamond 12i family can also be used in systems with height channels when partnered with compatible elevation, wall-mounted or ceiling speakers and a suitable AV receiver.
The centre speaker itself remains responsible for its conventional centre-channel role.
Does Diamond 12.Ci Support Dolby Atmos?
The 12.Ci is a passive loudspeaker and does not decode audio formats itself.
Dolby Atmos decoding and channel assignment are handled by the AV receiver or processor.
Does It Support DTS:X?
The same principle applies.
The speaker reproduces the electrical centre-channel signal supplied by the amplifier; surround-format decoding happens upstream.
Does It Need a Special Dolby Atmos Speaker Cable?
No. It uses conventional loudspeaker cable connected to the centre-channel amplifier output.
Good for Films?
Yes. This is its primary purpose.
The twin-driver layout and matching Diamond technology are designed to provide the vocal clarity, body and dynamic capability needed at the centre of a home cinema system.
Good for Television Drama?
Yes.
A dedicated centre speaker can be particularly valuable for programmes dominated by speech because voices remain physically anchored near the screen.
Good for Sport?
Yes. Commentary is commonly centred in broadcast mixes, while crowd ambience and stadium effects spread into the other channels.
Good for Gaming?
Yes. A surround gaming system can use the centre channel for voices and screen-related effects according to the game's audio mix.
Can It Be Used for Music?
Yes, particularly with multichannel music, concert films and surround mixes.
Conventional two-channel stereo music will normally use the left and right speakers unless the amplifier is operating in a multichannel processing mode.
Should I Use Surround Processing for Stereo Music?
That is a matter of preference.
If you want traditional stereo reproduction, use the appropriate two-channel mode on the amplifier. If you enjoy an upmixed surround presentation, the centre speaker may become active depending on the processing mode selected.
Can Diamond 12.Ci Be Used as a Single Mono Speaker?
It is physically capable of reproducing a mono signal, but it is designed specifically as a centre channel within a multichannel system rather than as a general-purpose standalone speaker.
Not Magnetically Shielded
Wharfedale specifies the Diamond 12.Ci as not AV shielded.
This is generally of little practical concern with modern flat-panel televisions, but it is worth knowing if the speaker is being used near older display technology that can be affected by magnetic fields.
Three Current Finishes
Diamond 12.Ci is available in the current Diamond 12i finish family:
- All Black
- Stone Grey
- Classic Walnut with Semi-Matte Black Baffle
All Black
The deep semi-matte Black finish is the most discreet option and integrates naturally beneath most modern televisions.
Stone Grey
Stone Grey provides a lighter and more contemporary alternative, particularly in modern neutral interiors.
Classic Walnut
Classic Walnut combines warmer wood tones with a contrasting semi-matte Black front baffle.
This can work especially well where the matching Diamond front speakers form a visible part of the room rather than being treated purely as cinema equipment.
Recommended Diamond 12.Ci Setup Routine
- Choose a stable shelf or cabinet capable of supporting the 8.5kg speaker.
- Position the centre directly above or below the television where possible.
- Keep it centred between the front left and right speakers.
- Measure the available 180mm height carefully if positioning beneath a tabletop television.
- Keep the front grille clear of cabinet edges and other obstructions.
- If the speaker sits low, use the supplied feet to angle it towards the listening position.
- If positioned high, angle it towards seated ear level where practical.
- Allow sufficient rear space for the speaker terminals and cable.
- Switch the AV receiver off before connecting speaker cable.
- Connect positive to positive and negative to negative.
- Power the system on at a conservative volume.
- Run the AV receiver's speaker calibration system where available.
- Check that the centre distance and level appear sensible.
- Review the receiver's bass-management settings.
- Listen to familiar dialogue from several seating positions.
- Make sure voices sound anchored to the screen rather than obviously below or above it.
- If dialogue sounds dull, check whether the speaker is recessed too deeply into furniture.
- If dialogue is difficult to hear, check angle, calibration and soundtrack settings before simply raising the centre level.
- Integrate a suitable subwoofer for the deepest bass and LFE content.
- Re-run calibration after major speaker-position changes.
Who Is Diamond 12.Ci For?
It is particularly well suited to:
- Wharfedale Diamond 12i home cinema systems
- Customers adding a centre channel to Diamond front speakers
- 5.1 surround systems
- 7.1 surround systems
- Dolby Atmos systems using a compatible AV receiver
- DTS:X systems using a compatible AV receiver
- Film and television viewing
- Sports and gaming systems
- Customers wanting clearer screen-anchored dialogue
- Systems where the centre must sit relatively close to a wall
- TV cabinets where a rear-ported centre would be less convenient
Key Features
- Wharfedale Diamond 12.Ci
- Diamond 12i centre speaker
- Current Diamond centre channel
- Two-way passive design
- Closed-box enclosure
- No bass-reflex port
- Twin 130mm drivers
- Twin 5-inch Klarity cones
- Polypropylene and mica composite
- Ribbed cone profiles
- Low-damping surrounds
- Precision magnetic motor systems
- Aluminium compensation rings
- Reduced inductance variation
- Glass-fibre epoxy voice-coil formers
- 25mm textile-dome tweeter
- Woven polyester treble diaphragm
- High-loss tweeter damping
- Minimal tweeter waveguide
- Broad high-frequency dispersion
- Linkwitz-Riley crossover
- Air-core inductors
- 2.2kHz crossover
- Multilayer cabinet construction
- Computer-modelled spot bracing
- Revised Diamond 12i internal damping
- Tighter production tolerances
- 8.7L cabinet volume
- 90dB sensitivity
- 20–120W recommended amplification
- 96dB peak SPL
- 8O compatible
- 4O minimum impedance
- 90Hz–20kHz frequency response
- 80Hz bass extension at -6dB
- 180mm height
- 480mm width
- 180mm cabinet depth
- 208mm overall depth including terminals
- 8.5kg weight
- Supplied centre-speaker mounting feet
- Vertical angle adjustment using feet
- Suitable above or below television
- Designed for stable shelf placement
- Suitable for matching Diamond 12i systems
- All Black finish
- Stone Grey finish
- Classic Walnut finish
Frequently Asked Questions
Is the Wharfedale Diamond 12.Ci current?
Yes. Diamond 12.Ci is the current centre-channel speaker in Wharfedale's Diamond 12i range.
Is Diamond 12.Ci sold individually?
Yes. It is a single centre-channel loudspeaker, not a stereo pair.
What is Diamond 12.Ci designed for?
It is designed primarily as the centre channel in a Wharfedale Diamond 12i home cinema system.
Is it the replacement for Diamond 12.C?
Yes. Diamond 12.Ci is the refreshed current-generation version.
What changed from Diamond 12.C?
The 12i generation brings current finishes, revised internal refinement and tighter production tolerances while retaining the core driver architecture and headline acoustic specification.
Does Diamond 12.Ci have a bass-reflex port?
No. Wharfedale specifies it as a closed-box speaker.
Why does some Diamond 12i information mention revised port tuning?
That information relates to the wider Diamond 12i range. The 12.Ci itself is sealed and therefore has no bass-reflex port.
Is a sealed centre speaker useful?
Yes. It can make placement close to a television, shelf or wall easier because there is no reflex opening that needs clearance for airflow.
Can I put it inside a TV cabinet?
Yes if the shelf is stable and large enough. Keep the front of the speaker near the front edge rather than burying it deep inside the furniture.
Can I place it below the television?
Yes. This is a normal installation position.
Can it go above the television?
Yes. Wharfedale's manual permits placement above or below the screen.
Should it be angled towards me?
Yes if it is positioned substantially above or below ear level.
Are angled feet included?
Wharfedale supplies mounting feet that can be combined to alter the vertical angle of the centre speaker.
Why angle the centre speaker?
Aiming it towards the listening position gives the drivers a more direct acoustic path to the listeners when the cabinet sits well above or below ear height.
How wide is Diamond 12.Ci?
480mm.
How high is it?
180mm.
How deep is the cabinet?
180mm before allowing for the terminals.
What is the overall depth?
Approximately 208mm including Wharfedale's 28mm terminal allowance.
How much does it weigh?
8.5kg.
Can I place it directly on my television?
No. Use a stable shelf, stand or cabinet designed to support the speaker safely.
What size are the main drivers?
There are two 130mm or five-inch drivers.
What is Klarity?
Klarity is Wharfedale's composite cone material made from polypropylene and mica.
Why add mica?
The mica increases stiffness while retaining the useful low mass and damping characteristics of polypropylene.
What size is the tweeter?
25mm or one inch.
What is the tweeter made from?
Woven polyester with a high-loss damping coating.
What is the crossover frequency?
2.2kHz.
What is the sensitivity?
90dB for 2.83V measured at one metre.
What amplifier power does Wharfedale recommend?
20 to 120 watts.
Will a 50W AV receiver work?
A genuinely capable amplifier around this output falls within Wharfedale's recommendation, although multichannel power delivery should be considered for the complete system.
Can I use 100W?
Yes. That falls within the recommended range.
Can I use 120W?
Yes. 120W is the upper end of Wharfedale's recommendation.
What is the impedance?
Wharfedale describes the speaker as 8O compatible with a 4O minimum impedance.
What is the frequency response?
90Hz to 20kHz within +/-3dB.
How low does Diamond 12.Ci play?
Wharfedale specifies bass extension to 80Hz at -6dB.
Does it need a subwoofer?
For a full home cinema system, a subwoofer is strongly recommended to reproduce the lowest frequencies and dedicated LFE information.
Does the subwoofer replace the centre speaker?
No. They perform completely different jobs. The centre anchors dialogue and screen-related sounds, while the subwoofer handles very low frequencies.
What crossover should I set on my AV receiver?
Use the receiver's calibration and bass-management guidance. The 12.Ci reaches to 80Hz at -6dB, but the optimum electronic crossover depends on the room, subwoofer and complete speaker system.
Should I set the centre speaker to Large?
Do not assume so based on cabinet size. Follow the AV receiver's bass-management setup and room-calibration results.
Is Diamond 12.Ci good for dialogue?
Dialogue reproduction is one of the principal reasons for using a dedicated centre speaker, and the 12.Ci is specifically designed for this role in the Diamond 12i system.
Will it make quiet dialogue louder?
It gives dialogue a dedicated physical speaker, but the final level still depends on the soundtrack, AV receiver calibration and chosen listening mode.
What if speech is still hard to hear?
Check the centre angle, cabinet position, AV level calibration, distance settings and any dialogue-enhancement options provided by the receiver.
Should the centre be exactly in the middle?
Ideally, yes. Wharfedale recommends positioning it centrally between the front left and right speakers and close to the television.
What if the TV stand forces it slightly off-centre?
Try to get it as close to the screen centre line as practical. Large lateral offsets can make centrally mixed sounds appear disconnected from the picture.
Can Diamond 12.Ci work with Diamond 12.1i?
Yes. It is designed as part of the same Diamond 12i family.
Can it work with Diamond 12.2i?
Yes.
Can it work with Diamond 12.3i?
Yes. That combination makes a strong basis for a medium-sized home cinema system.
Can it work with Diamond 12.4i?
Yes. Diamond 12.Ci is the matching current centre model for the wider Diamond 12i range.
Can Diamond 12.0i be used as surround speakers with it?
Yes. Compact Diamond speakers can be used for surround duties in an appropriately configured system.
Do my rear speakers need to be the same size as the front speakers?
No. It is common to use smaller matching-family speakers at the rear while using larger front loudspeakers.
Does it work in a 5.1 system?
Yes. This is a natural application.
Does it work in a 7.1 system?
Yes, with a compatible AV receiver or processor.
Can it be used in a Dolby Atmos system?
Yes. The AV receiver performs the Dolby Atmos decoding while the 12.Ci reproduces the assigned centre channel.
Can it be used in a DTS:X system?
Yes, on the same principle.
Does Diamond 12.Ci have Dolby Atmos built in?
No. It is a passive speaker and contains no surround decoder or electronics.
Does it have an amplifier built in?
No. It requires a suitable external AV receiver or power amplifier.
Does it have Bluetooth?
No.
Does it have WiFi?
No.
Does it need mains power?
No. The speaker receives power from the connected amplifier through the speaker cable.
Can I use it with a stereo amplifier?
Only if the amplifier or processor provides a dedicated centre-channel output and appropriate multichannel processing. A conventional two-channel stereo amplifier normally does not.
Can I use Diamond 12.Ci for stereo music?
A conventional stereo recording normally uses the left and right speakers only. The centre may be used if the AV receiver applies a surround or upmixing mode.
Is it good for concert films?
Yes. Multichannel concert recordings can make extensive use of the centre channel for vocals and stage information.
Is it good for sport?
Yes. Commentary and other centrally mixed information can benefit from a dedicated centre channel.
Is it good for gaming?
Yes. Games with multichannel audio can route voices and positional effects through the centre according to the mix.
Is Diamond 12.Ci magnetically shielded?
No. Wharfedale specifies AV shielding as no.
Will that affect my OLED or LCD TV?
Magnetic shielding is generally far less relevant to modern flat-panel displays than it was to old CRT televisions.
What finishes are available?
The current Diamond 12i finishes are All Black, Stone Grey and Classic Walnut with a semi-matte Black baffle.
Can I mix finish colours?
Technically yes, although most customers choose a matching finish across the visible front speakers.
Can the grille be removed?
The speaker is designed with a removable front grille, but take care not to touch the exposed drive units.
Should I leave the grille on?
Either arrangement can be used according to preference. Keeping it fitted provides useful physical protection.
Should I recalibrate the AV receiver after installing it?
Yes. Run the receiver's calibration system again after adding or substantially repositioning any speaker.
Should I recalibrate if I change the centre angle?
For a meaningful placement change, recalibration is sensible because the acoustic relationship with the listening position has changed.
Is Diamond 12.Ci worth adding to a stereo Diamond system?
If you are converting the system to multichannel home cinema with an AV receiver, yes. A conventional stereo-only setup does not require a centre speaker.
Should I audition a centre speaker?
Yes where possible. Dialogue clarity, tonal integration and the way the speaker works with your chosen front speakers are worth hearing for yourself.
Related Wharfedale Products and Audio T Guides
Why Buy Wharfedale Diamond 12.Ci From Audio T?
A centre speaker is not simply a box to fill the space below the television. Its height, angle, cabinet position, matching with the front speakers and AV receiver calibration all affect how convincing dialogue and screen-centred effects ultimately sound.
Audio T can help build a complete Wharfedale Diamond home cinema system around the room you actually have, rather than treating every customer as though they need the same combination of speakers. We can advise on front-speaker size, centre placement, surround speakers, amplification, subwoofers and system setup.
- In-store Wharfedale demonstrations
- Diamond 12.Ci demonstrations
- Complete Diamond 12i system demonstrations
- Centre-speaker placement advice
- Dialogue clarity setup
- AV receiver matching
- AV amplifier power matching
- 5.1 system planning
- 7.1 system planning
- Dolby Atmos system planning
- DTS:X system planning
- Subwoofer matching
- Bass-management advice
- Speaker cable advice
- Room calibration guidance
- Front-speaker matching
- Surround-speaker matching
- System upgrade advice
- Part-exchange options
- Ongoing after-sales support
Contact your local Audio T store to discuss the Wharfedale Diamond 12.Ci or plan a complete Diamond home cinema system.