SCS70 Pro Subwoofer


The ATC SCS70 Pro is a high-performance 12”/300mm active subwoofer, designed from the ground up to deliver the exceptional levels of performance required to partner ATC’s active monitors. Its performance and features make it ideally suited to use within stereo, multi-channel surround and immersive audio systems.

The sub features a sealed-box (infinite baffle) design, chosen for its balance of sub-bass extension and driver control. The cabinet is heavy and inert to minimize cabinet coloration. The subwoofer cabinet features a panel mounted in its front face with two LEDs to indicate ‘on’/’limit’ and ‘mute’.

The SS75-314SC driver employed in the SCS70 Pro has been meticulously optimized to reproduce the lowest 3 octaves of the audio band within the design of the SCS70 subwoofer system. It employs a short-coil operating in an exceptionally long magnetic gap to deliver high sound pressure levels with very low levels of distortion.



The SCS70s convection cooled amplifier is mounted in the rear of the SCS70 Pro cabinet. Two balanced inputs enable connection to mono or stereo sources. A pair of buffered, un-filtered balanced outputs are provided for connection to partnering active monitor loudspeakers or to ‘daisy-chain’ multiple subs. 21dB range of gain control, three low pass frequency settings, polarity switch and a 180 degree continuously variable phase setting allow the user to optimize the subwoofer for use with a very wide range of partnering loudspeakers. The low pass filter can also be set to ‘Off’ (320Hz) should the user wish to use the SCS70 Pro with external processing. The amplifier features fault monitoring of amp panel temperature and power amplifier D.C offset either fault condition is indicated via illumination of a single red LED mounted on the amp panel.

When in use, the subwoofer output can be muted using a single latching footswitch connected via a ¼”/6.35mm jack. The mute function does not affect the outputs to the primary monitor loudspeakers, only the output from the sub itself. Additional subs cab be muted using the same single footswitch via connection to the mute ‘Thru’ jack.


Want to Know More?


SCS70 Pro F.A.Q. with ATC Head of Engineering Rich Newman PDF


ATC System Recommendations for Stereo and Multichannel PDF


Typical System Configuration Drawings PDF


Initial Setting Recommendations PDF


SCS70 Pro Technical Data Sheet PDF



Acoustic Specifications
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)
MaxSPL: 110dB continuous, 116dB peak (IEC Weighted Pink Noise, measured at 1m, half space, low pass filter set at 80Hz)
Sensitivity: +4dBu ref 88dBC (single channel driven, Gain +6dB, Level 0dB, pink noise, low pass filter set at 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
Input CMRR: 90dB at 200Hz
Input Impedance: Approx. 20kΩ (differential)
Output Impedance: Approx. 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, active limiter indicated on front panel
Sensitivity: 1.55Vrms for full power (single channel driven, Gain 0dB, Level 0dB)
Power Consumption: Idle 8W / 14VA,
1/8th Power 170W / 230VA,
Full Power 500W / 600VA.
Mains Input: 220-230V, 115V – Factory set. Please observe panel markings and labels
Additional: Mute via ¼”/ 6.35mm Jack socket, controlled via latching footswitch
Sub Dimensions including rear heatsink: 21.3” x 18.3” x 22”
Sub Weight: 96.8lbs
Wood Crate Dimensions: 27.5” x 23.75” x 32.5”
Wood Crate with Sub Weight: 135.3lbs