Audio T Verdict
The PMC Prophecy7 is where the Prophecy range takes a major step forward, combining a dedicated soft-dome midrange driver with PMC's latest bass, treble and airflow technology.
Its three-way design divides the music between a 125mm LT XL mineral-cone bass driver, a 55mm soft-dome midrange and a 27mm soft-dome tweeter. This allows vocals and instruments to be reproduced by a driver created specifically for the most information-rich part of the audible range.
The 1.91-metre Advanced Transmission Line and LaminairX vent help the slim cabinet produce controlled and articulate low frequencies, while the profiled midrange and tweeter waveguide supports wide dispersion and stable stereo imaging.
With 88dB sensitivity and a 6-ohm impedance, the Prophecy7 is relatively accommodating for a speaker of this capability. It will work with a carefully chosen integrated amplifier, but its transparency, dynamic range and low-frequency control justify considerably more ambitious electronics.
The Prophecy7 is an excellent choice for listeners who want the midrange clarity and scale of a three-way loudspeaker without introducing an excessively wide or visually imposing cabinet.
PMC Prophecy7 Three-Way Floorstanding Speakers
The PMC Prophecy7 is a pair of premium passive floorstanding speakers designed for high-quality stereo music systems, multichannel music and carefully configured home cinema installations.
Each cabinet combines:
- A 125mm PMC LT XL long-throw mineral-cone bass driver
- A rigid cast-alloy bass-driver chassis
- A dedicated 55mm soft-dome precision midrange driver
- A 27mm PMC soft-dome tweeter
- A profiled midrange and tweeter waveguide
- A hand-built high-order passive crossover
- 600Hz and 3.1kHz crossover frequencies
- PMC Advanced Transmission Line bass loading
- A 1.91m effective transmission-line length
- PMC LaminairX aerodynamic airflow technology
- A heavy extruded-aluminium base
- One pair of satin-nickel 4mm binding posts
- Full-face magnetic grilles
- Premium real-wood finishes
PMC specifies:
- 40Hz to 20kHz frequency response at the -3dB points
- 88dB sensitivity for 1W at one metre
- 6-ohm impedance
- 25W to 250W recommended amplifier power
- 23.7kg weight per speaker
A Separate Amplifier Is Required
The Prophecy7 is a passive loudspeaker. It does not contain built-in amplification, a volume control, network streaming, Bluetooth or Wi-Fi.
It must be connected to a suitable integrated amplifier, stereo receiver or power amplifier using speaker cable.
True Three-Way Speaker Design
The Prophecy7 divides the audible frequency range between three purpose-designed drive units.
The passive crossover directs:
- Low frequencies to the 125mm LT XL bass driver
- Midrange frequencies to the 55mm soft-dome driver
- High frequencies to the 27mm soft-dome tweeter
The transition from bass to midrange takes place at approximately 600Hz, with the midrange handing over to the tweeter at approximately 3.1kHz.
This arrangement allows each drive unit to operate across a narrower and more appropriate frequency range than it would in a conventional two-way design.
Why Use a Dedicated Midrange Driver?
Much of the information that allows us to recognise voices and instruments lies within the midrange.
This includes:
- Human vocals
- Guitars
- Piano
- Woodwind instruments
- Strings
- Brass instruments
- Dialogue
- The attack and body of drums
In a two-way speaker, the main cone must reproduce both bass and much of this midrange information.
The Prophecy7's dedicated 55mm soft-dome driver allows the 125mm cone to concentrate on lower frequencies, while the tweeter handles only the upper range.
Potential benefits include:
- Clearer vocal reproduction
- More precise instrumental texture
- Reduced demand on the bass driver
- Reduced demand on the tweeter
- Improved dispersion through the vocal range
- Greater clarity during complex musical passages
55mm Soft-Dome Precision Midrange
The dedicated 55mm soft-dome midrange driver draws on PMC's professional studio-monitoring and installation experience.
Unlike a conventional cone midrange, the soft dome presents a broad radiating surface without a projecting cone profile.
The driver operates between approximately 600Hz and 3.1kHz, covering a particularly important region for:
- Vocal intelligibility
- Instrumental timbre
- Spatial positioning
- Dialogue clarity
- Musical expression
Moving the crossover points away from the centre of the vocal range also helps the midrange driver reproduce much of that region without a crossover transition occurring through it.
Profiled Midrange and Tweeter Waveguide
The midrange and tweeter are mounted within a sculpted waveguide developed specifically for the Prophecy range.
The waveguide is designed to help:
- Control the dispersion of both drivers
- Improve their acoustic integration
- Create a stable stereo image
- Maintain a consistent tonal balance away from the central seat
- Reduce abrupt changes in directivity around the crossover
The midrange and tweeter therefore work as a closely integrated upper-frequency system rather than as two unrelated drive units mounted on a flat baffle.
125mm LT XL Mineral-Cone Bass Driver
Low frequencies are reproduced by PMC's 125mm LT XL long-throw driver in a rigid cast-alloy chassis.
The driver handles:
- Bass guitar
- Double bass
- Kick drums
- Lower piano notes
- Orchestral percussion
- Electronic bass
- Film and television effects
- The lower body of instruments and voices
The lightweight mineral-filled cone is designed to combine rigidity, low moving mass and internal damping.
Its long-throw suspension permits substantial controlled movement, while the cast-alloy chassis gives the motor and moving assembly a stable mechanical foundation.
Because the dedicated midrange driver takes over at 600Hz, the bass driver can be optimised more specifically for low-frequency reproduction than the main driver in a two-way speaker.
27mm Soft-Dome Tweeter
High frequencies are reproduced by a 27mm soft-dome tweeter developed using technology proven in PMC's professional monitors.
The tweeter handles information including:
- Vocal harmonics
- Cymbals and percussion
- String harmonics
- Acoustic ambience
- Reverberation
- Spatial and recording information
A purpose-designed dispersion grille and profiled waveguide help control the tweeter's off-axis output and its integration with the 55mm midrange dome.
Hand-Built High-Order Crossover
The Prophecy7 uses a high-order passive crossover designed to keep each drive unit within its intended operating range.
PMC's Prophecy crossover construction includes:
- A substantial military-grade circuit board
- Thick copper tracks
- Gold through-plating
- Carefully selected components
- Precision component matching
- Optimised component positioning
- Steep filter slopes
The steep crossover slopes help limit unwanted overlap between the drivers and reduce the amount of out-of-band energy each unit must reproduce.
600Hz and 3.1kHz Crossover Points
The bass driver hands over to the soft-dome midrange at approximately 600Hz.
The midrange then hands over to the tweeter at approximately 3.1kHz.
These crossover points allow the 55mm dome to cover a broad section of the vocal and instrumental range.
They also keep the larger 125mm driver away from the frequencies where its dispersion would naturally become more directional.
PMC Advanced Transmission Line
The Prophecy7 uses PMC's Advanced Transmission Line, commonly abbreviated to ATL.
Sound energy generated by the rear of the bass driver enters a long, folded and acoustically damped internal passage.
The damping material is designed to absorb unwanted upper-frequency energy while allowing useful low-frequency output to travel towards the LaminairX vent.
PMC uses ATL technology to pursue:
- Extended bass from a relatively narrow cabinet
- Controlled low-frequency decay
- Reduced unwanted midrange output from the vent
- Clear separation between bass and midrange frequencies
- Consistent tonal balance at different listening levels
- Low-frequency definition rather than excessive overhang
1.91-Metre Effective Transmission Line
The Prophecy7 contains a folded transmission line with an effective length of approximately 1.91 metres.
The line is designed around the complete speaker, including:
- The 125mm LT XL bass driver
- The cabinet volume
- The internal acoustic damping
- The passive crossover
- The LaminairX exit
The line is longer than the 1.79-metre ATL used in the Prophecy5 and Prophecy1.
PMC LaminairX Technology
LaminairX is PMC's latest aerodynamic transmission-line vent.
The extended internal fins manage the high-speed airflow leaving the Advanced Transmission Line.
PMC designed LaminairX to reduce:
- Air turbulence
- Aerodynamic drag
- Resistance at the transmission-line exit
- Unwanted airflow noise
- Low-frequency harmonic distortion
PMC states that the design reduces associated harmonic distortion by up to 3dB.
The intended result is cleaner bass timing, improved dynamic range and greater consistency as the listening level increases.
Heavy Extruded-Aluminium Base
The LaminairX vent is incorporated into a substantial extruded-aluminium base.
The base performs several functions:
- It forms the transmission-line exit
- It controls airflow leaving the cabinet
- It lowers the speaker's centre of gravity
- It improves physical stability
- It provides a firm mounting point for the floor spikes
- It supports the rear speaker terminals
The heavy base allows the Prophecy7 to maintain a slim cabinet without requiring wide external outrigger bars.
40Hz to 20kHz Frequency Response
PMC specifies a frequency response of 40Hz to 20kHz at the -3dB points.
This is the same published lower-frequency figure as the smaller Prophecy5, but that single measurement does not describe the complete low-frequency performance.
The Prophecy7 adds:
- A longer transmission line
- A dedicated midrange driver
- Greater cabinet volume
- Higher sensitivity
- Higher recommended amplifier power
- Greater weight and mechanical stability
Bass quality also depends on distortion, timing, dynamic headroom, cabinet behaviour and integration with the rest of the frequency range.
The result heard in the room will also depend on:
- Distance from rear and side walls
- Room dimensions and construction
- Speaker and listening positions
- Amplifier control
- Floor construction
- Playback volume
- The low-frequency content of the recording
88dB Sensitivity
PMC specifies a sensitivity of 88dB for an input of 1W measured at one metre.
This makes the Prophecy7 more sensitive than the Prophecy1 and Prophecy5.
For a given amplifier voltage and listening distance, the Prophecy7 will generally play louder than a lower-sensitivity speaker.
The actual amplifier requirement will also depend on:
- Room size
- Listening distance
- Required playback level
- Amplifier current delivery
- The impedance presented across the frequency range
- The dynamic range of the recording
6-Ohm Impedance
The Prophecy7 has a published impedance of 6 ohms.
It can be partnered with a wide selection of modern stereo amplifiers, provided the amplifier manufacturer confirms compatibility with a 6-ohm passive speaker load.
A suitable amplifier should provide:
- Stable operation into 6 ohms
- Sufficient power for the intended room
- Good current delivery
- Low background noise
- Appropriate source connections
- A presentation that complements the complete system
Recommended Amplifier Power
PMC recommends amplifiers rated between 25W and 250W.
This is a compatibility guide rather than a requirement to use an amplifier at either extreme of the range.
A capable lower-powered amplifier may work effectively:
- In a smaller room
- At a shorter listening distance
- At moderate volume levels
- Where the amplifier has a strong power supply
A more powerful amplifier may provide:
- Greater dynamic headroom
- Improved low-frequency control
- More effortless reproduction in larger rooms
- Better handling of demanding musical peaks
- Greater freedom for future source upgrades
Amplifier Quality Matters More Than Wattage Alone
A 250W recommendation does not mean that a 250W amplifier is required or that the speakers cannot be damaged through excessive volume.
A lower-powered amplifier driven heavily into clipping can also damage loudspeaker drive units.
Reduce the volume immediately if you hear harshness, crackling, mechanical knocking or obvious distortion.
Amplifier and System Matching
The Prophecy7 is sufficiently revealing to show clear differences between amplifiers, source components and cables.
Potential amplifier partners include:
The PMC Cor provides a focused pure-analogue system, while the Rega Aethos offers substantial output and a similarly performance-led approach.
Other integrated, pre/power and streaming amplifiers may also be suitable. The correct choice will depend on the room, source equipment, required volume and future upgrade plans.
A demonstration with the intended amplifier is strongly recommended.
One Pair of Satin-Nickel Binding Posts
Each speaker provides one pair of satin-nickel 4mm binding posts.
The terminals accept suitable:
- 4mm banana plugs
- Spade connectors
- Correctly prepared bare speaker cable
The single-terminal arrangement keeps connection straightforward and avoids the removable links required by a bi-wireable design.
The Prophecy7 does not provide separate terminals for:
- Bi-wiring
- Passive bi-amplification
- Separate bass, midrange and tweeter connections
Speaker Cable and Polarity
Connect the amplifier's positive terminal to the corresponding positive terminal on the speaker.
Connect the amplifier's negative terminal to the speaker's negative terminal.
If one speaker is connected with reversed polarity, the system may produce:
- Weak or unfocused bass
- An indistinct central vocal image
- A diffuse stereo presentation
- Reduced image depth
When preparing bare speaker cable:
- Switch off the amplifier
- Disconnect it from the mains where practical
- Remove only the required amount of insulation
- Twist exposed strands tightly
- Prevent strands from touching the neighbouring terminal
- Tighten each connection securely
Browse speaker cables at Audio T or ask your local store about suitable lengths and professional termination.
Slim Cabinet and Substantial Weight
The Prophecy7 cabinet measures only 165mm wide, but each speaker weighs approximately 23.7kg.
This combination gives it a discreet front profile while providing the mass and internal volume required by its three-way drive-unit system and transmission line.
Its relatively slim shape can make it easier to accommodate than many conventional three-way loudspeakers, but the 310mm cabinet depth and additional cable clearance must be considered before installation.
Floor Spikes and Levelling
The extruded-aluminium base accepts adjustable floor spikes, adding approximately 20mm to the cabinet height.
When installing the speakers:
- Fit the spikes securely
- Adjust them so each cabinet stands vertically
- Ensure all contact points are stable
- Keep both speakers at the same height
- Use protective cups on hard or delicate floors
- Check stability after moving the speakers
Take Care When Lifting and Positioning
Each speaker weighs approximately 23.7kg.
Two people should handle each cabinet where necessary, particularly when fitting spikes, moving the speakers into position or protecting a real-wood finish.
Speaker spikes can mark wood, laminate, vinyl, tile and other hard surfaces, so suitable floor-protection cups should be used.
Positioning the Prophecy7
Begin with both speakers:
- Placed at equal distances from the main listening position
- A similar distance from the rear wall
- A similar distance from the nearest side walls
- Separated enough to form a convincing stereo image
- Level and stable on their bases
- Clear of furniture that obstructs the drivers or LaminairX vent
Moving the speakers closer to a wall will normally increase perceived bass weight but may reduce definition.
Moving them farther into the room can improve bass control, image depth and separation, although it may reduce apparent low-frequency output.
The front transmission-line exit provides useful flexibility, but the speakers will still interact with room boundaries.
Toe-In and Listening Angle
Toe-in describes how far the speakers are angled towards the listening position.
Begin with a modest inward angle and listen for:
- A stable central vocal image
- Natural high-frequency balance
- Clear separation between instruments
- A soundstage that extends beyond the cabinets
- Consistent sound across more than one seat
Increasing toe-in may sharpen central focus and increase direct high-frequency energy.
Reducing toe-in may widen the listening area and create a more spacious presentation.
Make small and equal adjustments to both speakers.
Magnetic Full-Face Grilles Included
The Prophecy7 includes full-face grilles covered in textured open-weave fabric.
Concealed magnets allow the grilles to attach without visible fixing holes in the front baffle.
The grilles may be useful where:
- A more discreet appearance is preferred
- Some protection from accidental contact is helpful
- Children or pets are present
- The exposed drive units do not suit the room
The fitted grille adds approximately 10mm to the cabinet depth.
For critical listening, compare the speakers with the grilles fitted and removed and use whichever presentation you prefer.
Real-Wood Cabinet Finishes
The Prophecy7 is available from Audio T in:
- Mediterranean Oak
- Natural Walnut
- Blackened Walnut
All three finishes provide the same drivers, crossover, cabinet construction and published performance.
The matched veneers are obtained from sustainable sources and finished to retain their natural texture.
Real wood varies in grain and shade, so each pair may differ slightly from product photography and display samples.
Adding an Active Subwoofer
The Prophecy7 does not contain a subwoofer output or bass-management system.
An active subwoofer can be added where the amplifier, streamer, pre-amplifier or AV processor provides a suitable connection.
A carefully integrated subwoofer may provide:
- Deeper sub-bass extension
- Greater impact with film and television effects
- Additional scale in a large room
- More weight from electronic and organ recordings
- Greater flexibility at lower listening levels
The subwoofer must contain its own amplification.
Level, crossover, phase and position should be adjusted carefully so it supports the Prophecy7 rather than drawing attention to itself.
Browse active subwoofers at Audio T or ask your local store about integration and setup.
PMC Prophecy5 or Prophecy7?
Choose the Prophecy5 When
- A slim two-way speaker is preferred
- The room is small or medium sized
- A smaller and lighter cabinet is easier to accommodate
- 20W to 200W amplifier matching suits the system
- A lower purchase price is important
- Its presentation is preferred after demonstration
Choose the Prophecy7 When
- A true three-way design is preferred
- A dedicated soft-dome midrange is important
- Greater vocal and instrumental separation is required
- Higher sensitivity and dynamic headroom are useful
- The larger and heavier cabinet can be accommodated
- The system electronics justify the step up
Explore the PMC Prophecy5 Floorstanding Speakers to compare the smaller two-way model.
PMC Prophecy7 or Prophecy9?
Choose the Prophecy7 When
- A compact three-way floorstander is preferred
- A 6-ohm load better suits the amplifier
- 40Hz published bass extension suits the room
- The slimmer and shallower cabinet is easier to place
- 25W to 250W amplifier matching is appropriate
- The lower purchase price fits the system budget
Consider the Prophecy9 When
- The flagship Prophecy model is required
- Dual 125mm bass drivers are preferred
- Deeper 35Hz published extension is important
- Higher 91.5dB sensitivity is useful
- The amplifier supports a 4-ohm speaker load
- The larger room and system can use its extra scale
Explore the PMC Prophecy9 Floorstanding Speakers to compare the flagship model.
Stereo and Home Cinema Systems
The Prophecy7 can be used as the main speaker in a high-quality stereo system or as part of a multichannel music and home cinema installation.
The wider Prophecy range includes:
PMC developed the range to maintain a consistent tonal presentation, helping different Prophecy models work together across front, centre and surround channels.
A complete home cinema system requires:
- A suitable AV receiver or processor
- Correct channel-level calibration
- Speaker-distance and delay adjustment
- Appropriate bass management
- A suitable subwoofer where required
Key Features
- Premium passive floorstanding speakers
- Supplied as a stereo pair
- True three-way speaker design
- Dedicated soft-dome midrange driver
- 125mm LT XL mineral-cone bass driver
- Long-throw bass-driver design
- Cast-alloy bass-driver chassis
- 55mm precision soft-dome midrange
- 27mm soft-dome tweeter
- Profiled midrange and tweeter waveguide
- Hand-built high-order passive crossover
- 600Hz bass-to-midrange crossover
- 3.1kHz midrange-to-tweeter crossover
- PMC Advanced Transmission Line
- 1.91m effective ATL length
- PMC LaminairX airflow technology
- Heavy extruded-aluminium base
- Front transmission-line exit
- 40Hz to 20kHz frequency response
- 88dB sensitivity
- 6-ohm impedance
- 25W to 250W recommended amplifier power
- One pair of 4mm binding posts
- Satin-nickel terminal finish
- Single-wire speaker connection
- Adjustable floor spikes
- Full-face magnetic grilles included
- Hidden grille fixings
- Textured open-weave grille fabric
- Mediterranean Oak finish
- Natural Walnut finish
- Blackened Walnut finish
- Real-wood cabinet finishes
- 965mm cabinet height
- 165mm cabinet width
- 310mm cabinet depth
- Approximately 23.7kg per speaker
- Designed and hand-built in Britain
- 20-year registered PMC warranty
Frequently Asked Questions
Are the PMC Prophecy7 speakers supplied as a pair?
Yes. The product includes one left and one right passive floorstanding speaker.
Are they active or passive?
They are passive speakers and require a suitable external amplifier.
Do they have Bluetooth, Wi-Fi or streaming?
No. Wireless and network playback must be provided by the connected amplifier or source.
Is the Prophecy7 a two-way or three-way speaker?
It is a true three-way speaker with separate bass, midrange and treble drivers.
What is the benefit of the dedicated midrange driver?
It allows vocals and instruments to be reproduced by a driver designed specifically for the midrange, while reducing the frequency range handled by the bass driver and tweeter.
What size is the midrange driver?
Each speaker uses one 55mm soft-dome precision midrange driver.
What size is the bass driver?
Each speaker uses one 125mm PMC LT XL mineral-cone bass driver.
What size is the tweeter?
Each speaker uses one 27mm soft-dome tweeter.
What are the crossover frequencies?
The bass driver hands over to the midrange at approximately 600Hz, while the midrange hands over to the tweeter at approximately 3.1kHz.
What is the frequency response?
PMC specifies 40Hz to 20kHz at the -3dB points.
What is the sensitivity?
88dB for 1W measured at one metre.
What is the impedance?
6 ohms.
What amplifier power does PMC recommend?
PMC recommends amplifiers rated between 25W and 250W.
Do I need a 250W amplifier?
No. The correct amplifier depends on room size, listening distance, required volume, power-supply quality and current delivery.
Can a 25W amplifier be used?
Potentially, particularly in a smaller room at moderate levels, but available headroom and control should be assessed carefully.
What is PMC ATL?
ATL stands for Advanced Transmission Line. It uses a long, damped internal passage to manage energy produced by the rear of the bass driver.
How long is the transmission line?
Approximately 1.91 metres.
What is LaminairX?
LaminairX is PMC's aerodynamic transmission-line vent, designed to reduce turbulence, resistance, airflow noise and associated harmonic distortion.
Is LaminairX built into the speaker base?
Yes. The vent is incorporated into the heavy extruded-aluminium base.
Can the speakers be placed close to a wall?
The front transmission-line exit provides useful flexibility, but wall distance still affects bass weight and definition. Experiment before choosing the final position.
How does the Prophecy7 differ from the Prophecy5?
The Prophecy7 is a three-way design with a dedicated 55mm soft-dome midrange, longer ATL, higher sensitivity, greater amplifier capacity and a larger cabinet.
Why do Prophecy5 and Prophecy7 both quote 40Hz?
The lowest published frequency is only one measurement. The Prophecy7 adds a dedicated midrange driver, longer transmission line, greater cabinet volume and increased dynamic capability.
How does the Prophecy7 differ from the Prophecy9?
The Prophecy9 adds a second 125mm bass driver, extends to a published 35Hz, has 91.5dB sensitivity and presents a 4-ohm load. It is larger and intended for greater scale.
Do they require speaker stands?
No. They are floorstanding speakers with a heavy aluminium base and adjustable spikes.
Are floor spikes included?
The speaker is designed to stand on adjustable spikes. Allow approximately 20mm beyond the cabinet height when they are fitted.
Can the Prophecy7 be bi-wired?
No. Each speaker has one pair of binding posts.
Which speaker-cable connections are supported?
The binding posts accept suitable 4mm banana plugs, spade connectors and correctly prepared bare cable.
Are the grilles included?
Yes. Full-face magnetic grilles with textured fabric are included.
Can a subwoofer be added?
Yes, where the amplifier, streamer, pre-amplifier or AV processor provides a suitable subwoofer connection.
Can they be used in a home cinema system?
Yes. They can be combined with the matching ProphecyC centre speaker and other Prophecy models in a suitably configured multichannel system.
Which finishes are available?
Mediterranean Oak, Natural Walnut and Blackened Walnut.
What are the cabinet dimensions?
Approximately 965 x 165 x 310mm per speaker (H x W x D). Allow another 20mm for the spikes, 23mm for the terminals and 10mm for the grille.
How much does each speaker weigh?
Approximately 23.7kg.
Are they made in Britain?
Yes. PMC designs and hand-builds its loudspeakers in the United Kingdom.
What warranty is included?
PMC offers a 20-year manufacturer warranty when the speakers are registered within 10 days of purchase, subject to its full terms and proof of purchase.
Related PMC Products and Audio T Guides
Why Buy From Audio T?
- PMC Prophecy7 demonstrations
- Prophecy5 and Prophecy7 comparisons
- Prophecy7 and Prophecy9 comparisons
- Two-way and three-way speaker comparisons
- Amplifier and speaker matching
- Room-size and listening-distance advice
- Speaker placement and toe-in guidance
- Floor-spike and levelling setup
- Hard-floor protection advice
- Speaker-cable selection and termination
- Subwoofer integration
- Stereo and home cinema system planning
- ProphecyC centre-speaker matching
- Real-wood finish demonstrations
- Home demonstrations where available
- Part exchange on suitable existing equipment
- PMC warranty-registration guidance
- Ongoing system and after-sales support
Contact your local Audio T store to arrange a demonstration or discuss amplification, cables, positioning and system matching for the PMC Prophecy7.