SCM25A Pro Mk2



The new SCM25A Pro Mk2 has been upgraded with ATC’s hand made proprietary SH25-76S Dual Suspension Tweeter, extending the high-frequency response with a reduction in distortion.


Like the original SCM25A, the new upgraded Mk2 is a compact 3-way high-performance active studio monitor loudspeaker, based around the hand made proprietary ATC 3”/75mm soft mid-dome driver and 6.5”/164mm bass driver loaded in a 25-litre vented cabinet. The monitor’s combination of exceptional mid-range clarity, high-output, extended bass response and modest size make it ideal for nearfield monitoring across a wide range of critical applications.



The 3-way monitor features drive units designed and manufactured by ATC, and are only available in ATC Loudspeakers.

• High frequencies above 3.5kHz are handled by ATC’s SH25-76S Dual-Suspension 1”/25mm soft dome tweeter. This HF driver update is the primary improvement from the Original SCM25A-to-SCM25A Mk2 model.
• Mid-range frequencies between 380Hz & 3.5kHz by the ATC 3”/75mm soft dome mid-driver.
• Low frequencies below 380Hz are handled by a 6.5”/164mm bass driver.
• The enclosure is a ported/vented type, tuned to 32Hz and featuring a 3”/75mm diameter port with flared entry & exit to minimize port air noise.


The SCM25A Pro Mk2 is actively driven by a 3-way class A/B amp pack mounted in the rear of the cabinet. Each drive unit has its own dedicated power amplifier. Audio input is via a rear panel mounted 3-pin female XLR and power via an IEC mains power inlet. There are user controls for input sensitivity and bass ‘boost’. Crossovers are 4th order Linkwitz-Riley and all-pass filters are included to optimize the phase response through the crossover regions, improving the tonal accuracy, imaging, on and off-axis frequency response. FET peak limiters are included to reduce amplifier ‘hard-clipping’. Power ‘on’ and limiter ‘active’ is indicated by a front panel mounted bi-colour LED.


product manual pdf


technical data sheet pdf



Acoustic Specifications
Drive Units Bass: 1 x SB50-164SC 8Ω
Mid: 1 x SM75-150 16Ω
HF: 1 x SH25-76S 6Ω Compact
Low Frequency Cut-off: 47Hz (-6dB, anechoic)
High Frequency Cut-off: 25kHz (-6dB)
Max SPL: 109dB continuous / 115dB peak (Per pair, IEC Weighted Pink Noise, 1m, anechoic)
Sensitivity: +4dBu ref 92dBC (Bass Boost 0dB, Input Sensitivity 1V, Pink noise)
Electronic Specifications
Balanced Input: 1 x Rear Panel Mounted Female XLR, pin 2 hot
Input Impedance: 20kΩ (differential)
Input CMRR: >82dB (10kHz)
Input Sensitivity: 2.2dBu / 1Vrms for full power
Input Sensitivity Control: Continuously Variable from 2.2dBu – 8.2dBu / 1Vrms - 2Vrms (-6dB)
Bass Boost Control: Continuously variable from 0dB to +3dB
Crossover Filters: 4th Order Linkwitz-Riley at 380Hz and 3.5kHz
Frequency Response: 200kHz (-3dB)
Amplifier type: Grounded Source MOSFET based Class A/B, convection cooled
Output Power: Bass 150W (8Ω), Mid 60W (8Ω), HF 32W (6Ω)
THD+N: <0.003%/-92dB (1kHz, 1dB below rated power, 90kHz BW)
Limiter: ATC Active FET Momentary Gain Reduction, limiter ‘active’ indicated via front panel LED
Mains Input: 220-230V or 115V – Factory set. Please observe panel markings and labels!
Power Consumption: Idle 24W/35VA. 1/8th Power 117W/159VA. Full Power 255W/324VA.
Heat Output: Idle 82BTU/hr. 1/8th power 335 BTU/hr. Full Power 358BTU/hr.
Physical Specifications
Net Weight: 25.1kg/55.2lbs
Product Dimensions: 271 x 430 x 411mm / 10.7” x 16.9” x 16.2” (H x W x D)
Packed Weight: 28.15kg/61.9lbs
Pack Dimensions: 370mm x 560 x 510 / 14 1⁄2 x 22 x 20 “ (H x W x D)