ATC Loudspeaker Technology

SCM25A Pro Mk2 Active Studio Monitor

The SCM25A Pro Mk2 is a compact 3-way high-performance active studio monitor loudspeaker, based around a 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 proprietary drive units designed and manufactured by ATC. Low frequencies below 380Hz are handled by a 6.5”/164mm bass driver, mid-range frequencies between 380Hz & 3.5kHz by the ATC 3”/75mm soft dome mid-driver. 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 Mk1-to-Mk2 model. The enclosure is a ported/vented type, tuned to 32Hz and featuring a 3”/75mm diameter port with flared entry & exit to minimise 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 optimise 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.

Overview
The SCM25A Pro Mk2 is a compact 3-way high-performance active studio monitor loudspeaker, based around a 6.5”/164mm bass driver. The monitors combination of exceptional mid-range clarity, high output, extended bass response and modest size makes it ideal for nearfield monitoring in a wide range of critical applications.
The latest Mk2 version is updated with ATC’s latest SH25-76S ‘Dual Suspension’ tweeter, extending the high-frequency response along with a reduction in distortion. These improvements ensure faster decision making and outstanding translation outside the studio.
Key Features
• 3-way design featuring ATC SM75-150 Soft Dome mid-range driver.
• Wide dispersion vs frequency for excellent stereo imaging over a large listening area.
• ATC discrete MOSFET class A/B amp-pack delivers high dynamic range in combination with very low distortion and an extended HF bandwidth.
• 4th order active crossovers with all-pass phase compensation ensure outstanding driver integration.
• Input sensitivity and bass ‘lift’ user controls.
• Hand-built in England and covered by a 6-year warranty.
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 Boot 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: <2Hz to >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 11/16th” x 16 15/16th” x 16 3/16th” (H x W x D) See drawing for full details.
Packed Weight: 28.15kg/61.9lbs
Pack Dimensions: 370mm x 560 x 510 / 14 ½ x 22 x 20 “ (H x W x D)

Retail price is for 1 pair.