ATC SCM25A PRO MK2 - Compact Three-Way Active Monitor Speaker (Pair)

ATC SCM25A PRO MK2 - Compact Three-Way Active Monitor Speaker (Pair)

The ATC SCM25A Mk2 is a compact 3-way active monitor designed for nearfield monitoring applications where critical listening is required. The SCM25A MK2 is based around s 6.5" bass driver, with a ATC 3" mid-driver and an ATC SH25-76S 1" soft dome tweeter delivering extended bass response and exceptional mid-range clarity. 

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.

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.

Specifications

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)