ATC SCS 120 Pro 15″ Professional Active Subwoofer

The SCS 120 Pro delivers reference-grade low-frequency extension for professional monitoring environments. Built around ATC’s proprietary 15″ SS75-375SC driver in a sealed box design, this active subwoofer reaches down to 20Hz while maintaining the accuracy and transient response ATC monitors are known for. A 300W convection-cooled discrete MOSFET Class A/B amplifier provides clean, controlled power, while four selectable low-pass filter points (50Hz, 65Hz, 80Hz, 320Hz) ensure seamless integration with ATC’s SCM series monitors in stereo, surround, and immersive audio configurations. With 119dB peak SPL capability, user-adjustable gain, polarity, and phase controls, plus unfiltered XLR throughputs for flexible system routing, the SCS 120 Pro extends your monitoring system with the precision critical listening demands.

Key Features:

• ATC Proprietary 15″ Driver: Custom SS75-375SC 8Ω driver in sealed box configuration delivers accurate low-frequency extension to 20Hz (-6dB, half space) with exceptional transient response.
• 300W Class A/B Amplification: Convection-cooled discrete MOSFET amplifier provides 113dB continuous SPL and 119dB peak output (IEC weighted pink noise, 1m, half space) for headroom in demanding production environments.
• Four Selectable Low-Pass Filters: Choose from 50Hz, 65Hz, 80Hz, or 320Hz crossover points (4th-order Linkwitz-Riley) to match your main monitors and room acoustics with precision.
• Optimized for ATC SCM Series: Engineered as the ideal partner for SCM45A, SCM50A, SCM100A, SCM110A, SCM150A, SCM200A, and SCM300A Pro monitors in stereo, surround, and immersive configurations.
• User-Adjustable Parameters: Front-panel controls for gain, low-pass frequency, polarity, and phase allow fine-tuning to your specific monitoring environment and system requirements.
• Flexible Connectivity and Control: Dual balanced XLR inputs and unfiltered XLR outputs enable flexible system routing, while optional remote muting via latching footswitch provides convenient control during sessions.

Specifications:

• Drive Unit – Bass: 1 x ATC SS75-375SC 8Ω.
• Low Frequency Cut-off: 20Hz (-6dB, half space, low pass filter set at 80Hz).
• Low Pass Filters: 50Hz, 65Hz, 80Hz, 320Hz. (-6dB, 4th order Linkwitz Riley).
• Max SPL: 113dB continuous, 119dB peak (IEC Weighted Pink Noise, measured at 1m, half space,
  low pass filter set at 80Hz).
• Sensitivity: 85dBC, ref. -17dBu (single channel driven, Gain +6dB, Level 0dB, pink noise, low pass filter set at 80Hz).
• Balanced Input: 2 x Rear Panel Mounted Female XLR, pin 2 hot.
• Input Impedance: Approx. 20kΩ (differential).
• Input CMRR: 90dB at 200Hz.
• Input Sensitivity: 1.12Vrms for full power (single channel driven, Gain 0dB, Level 0dB).
• 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.
• Low Pass Filters: 4th Order Linkwitz Riley.
• Output Impedance: Approx. 100Ω (differential).
• Amplifier type: Grounded Source MOSFET based Class A-B, convection cooled.
• Output Power: 300W in to 8Ω.