Hand-built in England, the ATC C4 Sub Mk2 is a high-performance active subwoofer, engineered to deliver professional studio quality sound to the home environment. Designed to integrate seamlessly into an existing audio system, its features have been carefully considered and its proprietary drive unit and active amplifier are designed to work together to reproduce the lower octaves of the audio band without compromise.
At its core is the SS75-314SC 12” (314mm) drive unit, meticulously engineered in-house by ATC to accurately reproduce sound below 160Hz. Its short coil operates within a very long magnetic gap to ensure minimal distortion across the full dynamic range, guaranteeing the highest quality audio experience.
The C4 Sub Mk2's active design integrates the driver and a 300W Class A-B MOSFET based power amplifier into a single system, ensuring peak performance. User controls allow for optimised integration with existing loudspeakers, delivering the same exceptional sound quality found in the world's top music and film recording studios.
ACOUSTIC SPECIFICATIONS
Drive Unit – Bass: 1 x SS75-314SC 8Ω
Low Frequency Cut-of f: 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”
