ATC - USA C4 Sub Mk2 12" Subwoofer

ATC C4 Sub Mk2 12" Subwoofer Key Features:

• High performance sealed box design using 12”/314mm ATC proprietary sub driver.
• Ideal partner to SCM19, SCM20, SCM40, SCM50 & SCM100.
• Suitable for use in stereo, home cinema and AV applications.
• On-board 300W convention cooled discrete MOSFET class A/B amp.
• 2 x balanced XLR inputs 2 x balanced XLR outputs (un-filtered/processed).
• User adjustable gain, low pass frequency, polarity and phase set

Product Description:

The ATC C4 Sub Mk2 stands as a pinnacle of audio engineering, featuring a 12” active subwoofer meticulously crafted to complement ATC’s active and passive loudspeaker series. Engineered with a sealed-box design, it strikes an ideal balance between sub-bass extension and precise driver control. The C4 Sub Mk2’s cabinet is crafted from heavy, inert materials to minimize coloration for pristine sound.

Harnessing the power of the SS75-314SC driver, this subwoofer system masterfully reproduces the lowest audio octaves with minimal distortion. Its convection-cooled amplifier resides discreetly within the rear cabinet. Equipped with balanced inputs and outputs, it seamlessly integrates into stereo, multi-channel, or immersive audio setups.

Fine-tuning is effortless with a 21dB gain control range, three low pass frequency settings, polarity switch, and a 180-degree phase setting. Whether partnered with loudspeakers or external processing, it adapts flawlessly, catering to a wide spectrum of preferences.

Moreover, its amplifier features intelligent fault monitoring, indicated by a single red LED, ensuring seamless operation. A latching footswitch, connected through a ¼”/6.35mm jack, allows easy muting of the subwoofer output without affecting the primary loudspeakers. 

Acoustic Specifications:

Drive Unit - Bass

1 x SS75-314SC 8Ω

Low Frequency Cut-off

22Hz (-6dB, half space, low pass filter set at 80Hz).

Low Pass Filters

50Hz, 65Hz, 80Hz, 320Hz. (-6dB, 4th order Linkwitz Riley). 

Max SPL

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

Finishes

Walnut, Oak, Cherry, Black Ash, Black Satin, White satin. 

Additional veneers and finishes can also be special ordered, please contact our sales team for more information

Additional

Mute via ¼”/ 6.35mm Jack socket, controlled via latching footswitch*

*Footswitch supplied separately, latching type, ¼”/6.35mm jack connection.

Dimensions and Weight:

Overall - 22 5/16” H  x 18 1/4” W x 19 11/16” D  (568 x 464 x 500 mm)

Product Weight - 92.6 lbs (42 kg)