Overview

2-Way Active Loudspeaker

The ATC SCM20A Pro mk2 is an active 2-way loudspeaker ideally suited to critical nearfield listening applications in all control rooms, LCR surround monitoring in small-to-medium control rooms, and surround channels in medium-to-large control rooms and provides faster editing with more consistent results on EQ'ing and balancing and less listening fatigue.

ATC’s 150mm/six-inch Super Linear bass/mid driver with a 75mm/three-inch voice coil and a short-coil, long-gap topology combines the high-power handling and low-power compression usually only found in large, high-efficiency systems with the fine resolution and balance of modern highfidelity systems. As a perfect complement the ATC SCM20A Pro mk2 features the ATC’s SH-25-76S 25mm/one-inch soft dome tweeter. With a massive neodymium motor, it provides an unparalleled linear and extended frequency response (-6dB @ 26kHz) and low non-linear distortion.

The amplifier is based on a discrete MOSFET Class A/B design with 200W and 50W continuous power available for the bass and high frequency sections, respectively and includes protection circuits for both DC offset and thermal overload. Controls for sensitivity and a low frequency shelf control help to achieve good balance in difficult acoustic conditions.

The cabinet is constructed from heavily-braced MDF. Highly damped, elastometric panels are bonded and stapled to the cabinet’s inner walls to suppress cabinet panel resonances, while the enclosure’s front panel is heavily radiused to reduce cabinet diffraction, improving the frequency response and imaging.

Product Details

  • Compact very high performance 2-way studio monitor
  • Ideally suited to critical near-field listening applications in all control rooms
  • LCR surround monitoring in small-to-medium control rooms and surround channels in medium-to-large contol rooms
  • Proprietary ATC 150mm/6 Super Linear Mid/Bass Driver
  • Proprietary ATC 25mm/1 S-Spec Tweeter
  • Discrete MOSFET class A/B bi-amp pack with 200W/50W continuous power output
  • 6 year product warranty
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 accessed trimmer)
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
230kHz
S+N/N ratio - LF
112dBA (Max. gain, ref. 40V, IEC ‘A’)
S+N/N ratio - HF
109dBA (Max. gain, ref. 20V, 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. DC offset protection.
Mains power requirements
115/230V, 50/60Hz (internally selectable)
Mains power consumption
381Watts/483VA Max
Weight
28kg/61.6lbs (per cabinet)
Dimensions (B x H x T)
250 x 450 x 343 mm