ATC Loudspeakers SCS70 Pro 12" Active Subwoofer

The ATC Loudspeakers SCS70 Pro is a high-performance 12-inch active subwoofer that delivers accurate low-frequency reproduction and seamless integration with ATC studio monitors. Its neodymium driver magnet and short, hand-wound voice coil provide high SPL performance with extremely low distortion, while the discrete Class AB MOSFET amplifier provides ample headroom and built-in limiting. Four low-pass filter settings, a continuously variable phase control, flexible I/O, and an optional footswitch make the ATC SCS70 Pro an extremely versatile active subwoofer for professional studios and immersive audio applications.

PAIRS PERFECTLY WITH ATC STUDIO MONITORS

The SCS70 Pro is specifically voiced to extend the response of ATC’s SCM25A, SCM50ASL, and SCM150ASL monitors, delivering rock-solid low-end that locks in with the brand's signature midrange clarity. Its sealed-box cabinet uses the same acoustic principles found in ATC’s full-range speakers, ensuring seamless tonal balance with no unwanted cabinet coloration.

CUSTOM 12-INCH DRIVER WITH HAND-WOUND VOICE COIL

At the heart of the SCS70 Pro is a custom-designed SS75-314SC driver with a hand-built voice coil. Mounted in an unusually long magnetic gap, this short-coil design reduces distortion and maximizes power handling. Precision magnet venting minimizes air-flow noise and heat, ensuring reliability during extended sessions. Combined with the sealed cabinet design, this custom driver boasts an extended low-frequency response from 2 Hz to 320 Hz, and a max SPL up to 116 dB.

DISCRETE MOSFET CLASS AB POWER AMPLIFIER

The subwoofer's 300 W Class A-B amplifier is built around grounded-source MOSFETs and ATC’s proprietary protection circuitry. This no-compromise amp-to-transducer design yields exceptionally low THD+N (<0.003% at 100 Hz, 300 W) and delivers robust, transparent low-end for demanding studio applications, including immersive audio formats such as Dolby Atmos.

STEREO BALANCED I/O

The ATC Loudspeakers SCS70 features comprehensive I/O including two balanced inputs for mono or stereo sources, and two buffered outputs for passing signal to your monitors in series, or daisy-chaining additional subs in multi-channel surround setups. Differential inputs offer 20 kΩ impedance with 90 dB common mode rejection at 200 Hz, ensuring clean signal transfer even in electrically noisy environments. This flexible I/O suite easily adapts to any studio configuration.

VERSATILE TONE CONTROLS

Tuning the SCS70 Pro to your system is easy and precise, thanks to its versatile tone controls. Choose from low-pass filter settings at 50 Hz, 65 Hz, 80 Hz, or Off (320 Hz) using a 4th-order Linkwitz-Riley slope for the ideal crossover curve to match your ATC loudspeakers. A continuously variable phase control and dedicated polarity switch make it possible to phase-calibrate the sub for seamless integration with your monitors and the room. The 21 dB total gain range ensures optimal output power for solid bass extension in any studio.

REMOTE MUTING VIA OPTIONAL FOOTSWITCH

A latching footswitch connected to the ¼-inch jack allows you to instantly mute the subwoofer when making A-B comparisons during mix sessions. The mute function only affects the sub output, leaving the full-range monitor outputs untouched. A Mute Thru jack allows one footswitch to control multiple SCS70 Pro subwoofers simultaneously, simplifying multi-sub setups in surround or immersive studios.

ATC SCS70 PRO 12 FEATURES:

• Active subwoofer for professional stereo, multi-channel surround, and immersive monitoring
• The ideal partner for ATC SCM25A, SCM50ASL, and SCM150ASL loudspeakers
• Front-firing, 12-inch SS75-314SC driver with hand-built coil reproduces the lowest three octaves with pinpoint accuracy down to 22 Hz and extended range below 2 Hz
• 300 W, convection-cooled MOSFET Class AB amplifier with built-in limiter and fault monitoring
• Balanced stereo XLR inputs allow you to feed the sub from a stereo main output
• Buffered XLR outputs send pure, unfiltered original signal to your monitors
• Low-pass filter can be set to 50 Hz, 65 Hz, 80 Hz or Off (320 Hz)
• Input for optional latching footswitch provides hands-free subwoofer muting with a Thru jack for controlling multiple subs
• Continuous 0–180° phase control and polarity switch
• Gain switch (0 dB, +6 dB, +10 dB) and 0–11 dB level control
• Frequency response down to below 2 Hz (–3 dB)
• 110 dB continuous/116 dB peak SPL (IEC-weighted pink noise)
• <0.003% THD+N at 100 Hz, 300 W into 8 Ω
• Input impedance 20 kΩ differential; output impedance 100 Ω differential
• Handcrafted in England