Audio T Verdict
The ATC C1C is a compact but exceptionally solid centre-channel speaker designed to keep dialogue, music and on-screen effects clear, natural and firmly connected to the picture.
Its twin 125mm mid/bass drivers and ATC-built 25mm soft-dome tweeter provide the tonal accuracy and dynamic ability required for serious home cinema, while the wide horizontal cabinet fits more easily beneath a television or projection screen than a conventional upright speaker.
The C1C is the natural centre speaker for systems using ATC SCM7 or SCM11 loudspeakers. Matching driver technology and closely related crossover design help voices and effects retain a consistent character as they move across the front soundstage.
Its 86dB sensitivity means it benefits from a capable AV amplifier, and its 280mm cabinet depth should be checked carefully before installation. Proper positioning and angling are equally important if the speaker sits above or below ear height.
ATC C1C Centre Channel Speaker
The ATC C1C is a passive centre-channel loudspeaker developed to provide clear dialogue, accurate tonal balance and convincing dynamic range within compact ATC surround-sound systems.
It combines two ATC 125mm mid/bass drivers with the company's 25mm soft-dome high-frequency unit and precision alloy waveguide.
The horizontal cabinet is designed to sit centrally above or below a television or projection screen, anchoring dialogue and front-stage effects to the picture.
An AV Amplifier Is Required
The C1C is a passive loudspeaker and does not contain its own amplification.
It must be connected to the centre-channel output of a suitable home cinema amplifier or processor and power-amplifier system.
Why the Centre Speaker Matters
Much of a film or television soundtrack is reproduced through the centre channel, including dialogue, narration and effects positioned directly on screen.
A capable centre speaker helps voices remain intelligible during busy scenes while keeping the sound firmly connected to the action rather than appearing to come from somewhere beneath or above the television.
It also forms the acoustic bridge between the front-left and front-right speakers. A well-matched centre allows effects, voices and music to move smoothly across the screen without an obvious change in tonal character.
Read our
centre-speaker setup guide
for further advice on positioning, angling and matching the front soundstage.
Designed to Match the ATC SCM7 and SCM11
ATC developed the C1C as the matching centre speaker for surround systems using the
ATC SCM7
or
ATC SCM11
.
Sharing closely related tweeter, mid/bass and crossover technology helps maintain a consistent tonal balance across the front-left, centre and front-right channels.
This matching is particularly noticeable when dialogue, vehicles, music or other effects pan across the screen.
ATC 25mm Soft-Dome Tweeter
High frequencies are reproduced by an ATC-designed and manufactured 25mm soft-dome tweeter using a neodymium magnet system.
A precision alloy waveguide helps control dispersion so that dialogue and high-frequency detail remain clear across the intended seating area.
ATC's dual-suspension design is engineered for low distortion, high power handling and reduced compression as playback levels rise.
Twin 125mm Mid/Bass Drivers
Two 125mm ATC mid/bass drivers are positioned on either side of the tweeter.
Each driver incorporates ATC's integral soft-dome construction, substantial motor assembly and an in-house hand-wound flat-wire voice coil.
The twin-driver arrangement provides the cone area and output capability required for dialogue, music and effects while keeping the cabinet low enough for practical screen placement.
Precision Crossover Design
The passive crossover was developed from the designs used in the SCM7 and SCM11.
It uses carefully selected components including metallised polypropylene capacitors, large air-cored inductors and ceramic wire-wound resistors.
The crossover operates at 2.5kHz and is designed to provide a smooth transition between the mid/bass drivers and tweeter.
Flat Impedance for Amplifier Compatibility
The C1C has a nominal impedance of 8 ohms and is designed with a relatively even impedance characteristic.
Avoiding unusually low impedance values and severe phase angles makes the speaker a more predictable load for a suitable AV amplifier.
It still requires quality amplification to achieve its intended dynamic range, particularly in larger rooms or at higher listening levels.
86dB Sensitivity
ATC specifies a sensitivity of 86dB for one watt measured at one metre.
This is lower than some home cinema speakers, so the C1C benefits from an amplifier with useful current delivery and sufficient clean power.
ATC recommends amplification between 75W and 300W, although AV receiver power ratings should be interpreted carefully because output can reduce when several channels operate simultaneously.
Amplifier Quality Matters
A high advertised wattage does not guarantee that an AV amplifier will maintain the same output when every channel is active.
Room size, listening distance, playback level and the number of connected speakers should all be considered when choosing the amplifier.
57Hz to 22kHz Frequency Response
ATC specifies a frequency response extending from 57Hz to 22kHz at the stated minus 6dB points.
This gives the C1C sufficient bass extension for natural male voices, music and many front-stage effects without requiring it to reproduce the deepest soundtrack frequencies.
Bass management within the AV amplifier should normally direct lower frequencies to the main speakers or a suitable powered subwoofer.
Adding an ATC Subwoofer
The
ATC C1 Sub Mk2
is the natural low-frequency partner for a compact system using the C1C and SCM7 loudspeakers.
A correctly integrated subwoofer reproduces the deepest bass and low-frequency effects while allowing the centre and surround speakers to operate within a more comfortable frequency range.
The larger
ATC C4 Sub Mk2
provides an upgrade path for larger rooms and more demanding systems.
Maximum Output of 103dB
The C1C is rated for a maximum sound pressure level of 103dB under ATC's stated conditions.
This provides useful dynamic headroom for dialogue, music and effects when the speaker is partnered with suitable amplification and used within an appropriately sized room.
Customers requiring greater output or matching for larger front speakers should consider the
ATC C3C centre speaker
.
Rigid and Damped Cabinet
The C1C uses a substantial internally braced cabinet engineered for rigidity and damping.
Controlling unwanted cabinet vibration allows more of the soundtrack to be reproduced by the drive units rather than being coloured by resonances from the enclosure.
The complete speaker weighs 12.7kg, giving it considerably more substance than its compact external dimensions might suggest.
Cabinet Dimensions and Grille Depth
The cabinet measures 161mm high, 410mm wide and 280mm deep.
The removable grille adds approximately 28mm to the overall depth, creating a total installed depth of around 308mm before space for speaker cable and connectors is considered.
Check the Furniture Depth Carefully
Allow space behind the cabinet for the speaker cable and avoid pressing the connections against the rear of a shelf or cabinet.
The front of the speaker should sit level with, or slightly ahead of, the surrounding furniture to reduce reflections from nearby surfaces.
Centre-Speaker Positioning
Position the C1C centrally in relation to the screen and as close to the picture as practical.
The cabinet should sit on a stable surface that can safely support its 12.7kg weight without flexing or vibrating.
Avoid hiding the speaker behind a solid cabinet door or placing it deep inside an enclosed furniture recess, as this can reduce clarity and exaggerate parts of the upper bass.
Aim the Speaker Towards the Listener
When the C1C sits below the screen, angle it upwards so the tweeter points towards seated ear height.
When installed above the screen, angle it down towards the listening area.
A secure purpose-built platform or adjustable isolation support should be used rather than unstable packing materials.
AV Amplifier Setup
Run the AV amplifier's speaker calibration after placing and connecting the C1C.
Check the measured distance, channel level and crossover settings rather than assuming every automatic result is correct.
The final centre level should provide clear dialogue without making voices sound unnaturally prominent compared with the left and right speakers.
Crossover Settings
A crossover around 80Hz provides a sensible starting point in many systems, but the correct setting depends on room acoustics, playback level and the partnering speakers and subwoofer.
A higher crossover may improve headroom with a smaller AV amplifier, while a lower setting may be appropriate where the amplifier and speaker can reproduce the required bass cleanly.
Listen for a smooth transition without thin dialogue, excessive chestiness or an obvious change in character between the centre and subwoofer.
C1C or C3C?
ATC C1C
- Twin 125mm mid/bass drivers
- Designed to match the SCM7 and SCM11
- 57Hz to 22kHz frequency response
- 86dB sensitivity
- 103dB maximum SPL
- 410mm-wide cabinet
- 12.7kg weight
- Suited to compact and medium-sized systems
ATC C3C
- Twin 150mm CLD mid/bass drivers
- Designed for larger ATC speaker systems
- Greater output capability
- Larger cabinet and driver area
- Better suited to larger rooms
- Natural partner for the SCM11, SCM19 and SCM40
View the ATC C3C centre speaker
Recommended ATC System
Compact C1 System
- ATC SCM7 front-left and front-right speakers
- ATC C1C centre speaker
- ATC SCM7 surround speakers
- ATC C1 Sub Mk2 active subwoofer
- Suitable multichannel AV amplification
Upgrade Options
- ATC SCM11 front speakers
- Additional SCM7 or SCM11 surround channels
- ATC C4 Sub Mk2 for greater bass output
- External power amplification where required
- Acoustic treatment or room correction
Finish Options
Cherry
A natural real-wood veneer designed to complement matching ATC Entry Series loudspeakers.
Black Ash
A darker real-wood veneer with visible grain and an understated appearance.
Satin Black
A discreet painted finish suited to television furniture and dedicated cinema rooms.
Satin White
A brighter painted option for light-coloured rooms and matching ATC speaker systems.
Real-wood veneer naturally varies in grain and shade, so individual cabinets may not match product photography exactly.
System Matching
Well Suited To
- ATC SCM7 home cinema systems
- ATC SCM11 front and surround speakers
- Compact and medium-sized cinema rooms
- Systems prioritising dialogue clarity
- AV amplifiers with capable power delivery
- Systems using the ATC C1 Sub Mk2
- Television and projection-screen installations
Check Before Buying
- Cabinet depth is 280mm without the grille
- The grille adds approximately 28mm
- The speaker weighs 12.7kg
- It requires external amplification
- 86dB sensitivity rewards capable amplification
- The support furniture must remain stable
- Correct positioning and angling are important
Setup Guidance
- Place the speaker centrally beneath or above the screen
- Aim the tweeter towards seated ear height
- Keep the front baffle clear of cabinet edges
- Allow room behind for the speaker cable
- Run the AV amplifier's calibration system
- Check channel level, distance and crossover manually
- Match the front speakers wherever practical
Browse our
centre and surround speakers
,
home cinema speakers
,
home cinema amplifiers
,
home cinema subwoofers
and
speaker cables
, or explore the complete
ATC range at Audio T
.
Key Features
- Passive centre-channel loudspeaker
- Designed to match the ATC SCM7 and SCM11
- ATC-designed and built 25mm soft-dome tweeter
- Precision alloy high-frequency waveguide
- Twin 125mm ATC mid/bass drivers
- Integral soft-dome mid/bass construction
- Massive FEA-optimised motor assemblies
- In-house hand-wound flat-wire voice coils
- Flat impedance characteristic
- Metallised polypropylene crossover capacitors
- Large air-cored crossover inductors
- Ceramic wire-wound crossover resistors
- 57Hz to 22kHz frequency response
- 86dB sensitivity
- 103dB maximum sound pressure level
- 8-ohm nominal impedance
- 75W to 300W recommended amplification
- Internally braced and damped cabinet
- Compact horizontal enclosure
- Six-year ATC warranty, subject to current terms
Frequently Asked Questions
What is the ATC C1C?
It is a passive centre-channel speaker designed for compact and medium-sized ATC home cinema systems.
Which speakers match the C1C?
ATC identifies the SCM7 and SCM11 as the principal matching front and surround speakers.
Does the C1C contain an amplifier?
No. It requires a suitable AV amplifier or external power amplifier.
How powerful should the amplifier be?
ATC recommends amplification between 75W and 300W, with the appropriate choice depending on the room, listening distance and required playback level.
How sensitive is the C1C?
Its specified sensitivity is 86dB at one watt and one metre.
How low does it play?
ATC specifies a low-frequency extension of 57Hz at the stated minus 6dB point.
Should I use a subwoofer?
A suitable powered subwoofer is recommended for reproducing deep bass and the low-frequency effects channel in a complete home cinema system.
Which ATC subwoofer matches it?
The ATC C1 Sub Mk2 is the natural partner for a compact system using the C1C and SCM7 speakers.
Where should the C1C be positioned?
Place it centrally above or below the screen and angle the tweeter towards the main listening area.
Can it be placed inside television furniture?
It can sit on suitable furniture, but the front baffle should remain clear of cabinet edges and the enclosure should not be hidden behind a solid door.
What crossover should I use?
Around 80Hz provides a useful starting point in many systems, although the final setting should be adjusted for the amplifier, subwoofer, room and listening level.
How large is the cabinet?
It measures 161mm high, 410mm wide and 280mm deep. The grille adds approximately 28mm to the depth.
How much does the C1C weigh?
ATC's current specification lists a cabinet weight of 12.7kg.
What is the difference between the C1C and C3C?
The C3C uses larger mid/bass drivers and provides greater output capability for larger rooms and systems using speakers such as the SCM19 or SCM40.
Which finishes are available?
The listed options are Cherry, Black Ash, Satin Black and Satin White.
Why Buy From Audio T?
- ATC front and surround speaker matching advice
- Comparison with the larger ATC C3C centre speaker
- AV amplifier and power-matching guidance
- Centre-speaker positioning and angling assistance
- Channel-level, distance and crossover setup
- ATC subwoofer matching and integration
- Speaker-cable recommendations
- Complete home cinema system planning
- Demonstrations with suitable ATC systems
- Home installation advice
- Ongoing system and setup support
Contact your local Audio T store
to arrange a demonstration or discuss matching the ATC C1C with your front speakers, AV amplifier and room.