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ACOUSTIC SPECIFICATIONS
Drive Unit - Bass: 1 x SS75-314SC 8Ω
Low Frequency Cut-off: 22Hz (-6dB, half space, low pass f ilter set at 80Hz).
Low Pass Filters: 50Hz, 65Hz, 80Hz, 320Hz. (-6dB, 4th order Linkwitz Riley).
MaxSPL: 110dB continuous, 116dB peak (IEC Weighted Pink Noise, 1m, half space, low pass filter @ 80Hz).
Sensitivity: +4dBu ref. 88dBC (single channel driven, Gain +6dB, Level 0dB, pink noise, low pass filter @ 80Hz).
ELECTRONIC SPECIFICATIONS
Amplifier type: Grounded Source MOSFET based Class A-B, convection cooled.
Output Power: 300W in to 8Ω.
THD+N: <0.003%/-90dB, at 100Hz, 300W into 8Ω over 90kHz bandwidth.
Balanced Inputs: 2 x Rear Panel Mounted Female XLR, pin 2 hot.
Input CMRR: 90dB at 200Hz.
Input Impedance: 20kΩ (differential).
Balanced Outputs: 2 x Rear Panel Mounted Male XLR, pin 2 hot.
Output Impedance: 100Ω (differential).
Frequency Response: <2Hz (-3dB) - 320Hz (-6dB, set by panel-controlled LP filter).
Low Pass Filters: 4th Order Linkwitz Riley
Gain Control: 0, +6dB, +10dB.
Level Control: 0dB -11dB in 1dB steps. Total range 21dB with use of Gain switch.
Phase Control: 0 -180° ref. Input .
Polarity Control: In-phase/Out-of-phase ref. Input .
Limiter: ATC Active FET Momentary Gain Reduction.
Sensitivity: 1.55Vrms for full power (single channel driven, Gain 0dB, Level 0dB)
Mains Input: 220-230V or 115V - Factory set. Please observe panel markings and labels!
Power Consumption: Idle 8W/14VA. 1/8th Power 170W/230VA. Full Power 500W/600VA.
Additional: Mute via ¼”/ 6 .35mm Jack socket , controlled via latching footswitch*.
* Footswitch supplied separately, latching type, ¼”/6.35mm jack connection.PHYSICAL SPECIFICATIONS
Net Weight: 42kg / 92.6lbs
Dimensions: HxWxD 568x464x500mm 22 ¹⁵⁄₁₆” x 18 ¼” x 19 ¹¹⁄₁₆”
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Free Delivery within Mainland UK.
30-Day Money-back Guarantee
Returns Policy
ATC C4 Subwoofer Mk2
Key Features:
Hand-built in England for premium quality and performance
12” (314mm) ATC proprietary drive unit engineered in-house for accurate low-frequency reproduction
Active design with 300W Class A/B MOSFET amplifier matched to the driver for optimised performance
Extended low-end frequency response below 160 Hz with minimal distortion
Short voice coil in a long magnetic gap for exceptional control and clarity
User-adjustable controls for seamless integration with loudspeakers and audio systems
Studio-grade bass performance trusted in professional recording and mastering environments
Designed for home audio systems with professional-level sound quality
