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ATC SCM20A SL PRO MK2 - Two-way active monitor (Pair) - Ex Demo

by ATC
Sold out
£3,780.00 inc. vat
£3,150.00 ex. vat
Please contact us for availability.


These ex demo ATC SCM20ASL PRO MK2 are is mint condition and sound amazing even in untreated surroundings. The SCM20ASL Pros are a compact, active, 2-way studio monitor featuring the same ATC built woofer and tweeter found in the SCM20PSL speaker. The low frequency sections woofer has a 150mm bass cone and a grafted 75mm soft dome for improved mid range.

The tweeter of the ATC SCM20ASL are ferrofluid free so will last a lifetime of listening. On the rear panel of the ATC SCM20PSL is a panel which allows for separate amplification of the bass, mid and high frequency drivers. ATC Speakers are found in some of the leading studio's all around the world and the ATC SCM20ASL's do not disappoint!



  • Drive unit - Low Frequency (LF) 6.5”/150mm Super Linear with 75mm/3" voice coil (SB75-150SL 8 Ohm)
  • Drive unit - High Frequency (HF) 1”/25mm dual suspension Soft Dome (SH25-76S 6 Ohm)
  • Amplitude linearity 80Hz - 20kHz (+/-2dB)
  • Cut-off frequencies 55Hz - 25kHz (-6dB freestanding)
  • Horizontal dispersion +/-80° coherent
  • Vertical dispersion +/-10° coherent
  • Maximum continuous SPL 108dB (per pair @ 1m)
  • Crossover frequency 2.1kHz


  • Audio input Rear panel mounted female XLR (pin 2 +ve)
  • Input sensitivity 1V/2V RMS or +2.2/+8.2dBu via switch (ref. bass full output)
  • Input sensitivity trim 0dB to -6dB (via rear panel pot)
  • Total input sensitivity range 1V/+2.2dBu to 4V/+14.2dBu
  • Input impedance 10kΩ per leg
  • LF amp max output power 200W continuous (1% THD)
  • HF amp max output power 50W continuous (1% THD)
  • THD LF amp 0.0006%/-104.4dB (100Hz, 1dB below rated power)
  • THD HF amp 0.0022%/-93.2dB (10kHz, 1dB below rated power)
  • Crossover filters 2nd order/ 12dB/oct critically damped with phase compensation
  • HF upper -3dB point 250kHz
  • S+N/N ratio - LF 112dBA (Max. gain, ref. 40V out, IEC ‘A’)
  • S+N/N ratio - HF 109dBA (Max. gain, ref. 20V out, IEC ‘A’)
  • Low frequency shelf cut/boost 80Hz, -2dB to +3dB in 1dB steps (via rear panel rotary switch)
  • Overload protection Active FET momentary gain reduction (inc. front panel mounted ‘limit’ LED)

Amplifier thermal trip circuit

  • Mains power requirements 115/230V, 50/60Hz (internally selectable by technician). 100V 50/60Hz factory set.
  • Max power consumption 381Watts/483VA
  • Accessories K&M 24120 Wall Mount (cabinet requires modification to accept ‘top-hat’ mount)
  • Weight 28kg/61.6lbs (per cabinet)