Heavy-duty monitors. The real deal for some, after a long and winding road. The ATC SCM20ASL Classic makes a splash in the studio with its razor-sharp midrange—it renders vocals tight and pure, the low frequencies cut off instantly with no muddy edges, and the high frequencies dance without straining.
Retail price: 9,607.00
The set is from 2025!
The ATC SCM20ASL Classic is an active three-way studio monitor that integrates midrange, treble, and bass frequencies to provide direct audio amplification. This ATC SCM20ASL Classic studio monitor is known for its accurate reproduction and clarity in every detail, while maintaining transparency in the stereo image and natural dynamics. Thanks to the quality of the midrange, every element in a recording remains audible, while the high frequencies are accentuated without harshness.
With the ATC SCM20ASL Classic, the soundstage is wide and open: instruments and vocals seem to float away from the monitor, with a depth that makes listening a rewarding experience. The tonal balance remains consistent regardless of volume, ensuring that even quiet passages retain their fluidity. The speaker succeeds in conveying subtle nuances with exceptional resolution and texture, which is particularly noticeable in acoustic passages where detail takes center stage.
For those looking for a high-quality reference speaker with controlled dynamics and a realistic stereo image, the ATC SCM20ASL Classic is a compelling choice. Interested in scheduling a listening session or comparing this monitor to other models? Please contact us so we can explore trade-in options or comparison opportunities.
Drive units: Mid-Bass: 1× SB75-150SL 150 mm (6″) 8 Ω High Frequency: 1× SH25-76S 25 mm (1″) dual-suspension soft-dome 6 Ω Low-Frequency Cut-Off: 55 Hz (−6 dB, anechoic) High-Frequency Cut-Off: 25 kHz (−6 dB) Matched Response: ±0.5 dB Crossover Point: 2.2 kHz Max SPL: 108 dB continuous, 114 dB peak (per pair, IEC-weighted pink noise, 1 m, anechoic) System Sensitivity: 85 dBC SPL (@1 m, pink noise, −18 dBu, 1 V input sensitivity, 0 dB bass boost)
Balanced Input: 1× rear-panel female XLR, pin 2 hot Input Impedance: 20 kΩ differential Input CMRR: > 60 dB @ 10 kHz Input Sensitivity for Full Power: 2.2 dBu / 1 Vrms Input Sensitivity Control: −6 dB switchable, −6 dB variable; total range 2.2 dBu / 1 Vrms to 14.2 dBu / 4 Vrms Bass Shelf: −2 dB to +3 dB, switchable in 1 dB steps Crossover Filters: 2nd-order Linkwitz-Riley
Amplifier Type: Grounded-Source MOSFET, Class A/B, convection-cooled Output Power: Bass/Mid-Bass 200 W into 8 Ω; High Frequency: 50 W into 8 Ω THD+N: < 0.0017% / −95 dB (1 kHz, 1 dB below rated power, 90 kHz bandwidth) Frequency Response (amplifier): 200 kHz (−3 dB) Limiter: Active FET momentary gain reduction Protections: DC offset; over-temperature (rear-panel LED indication)
Power Consumption: Idle 26 W / 41 VA; at 1/8 power 116 W / 161 VA; full power 312 W / 398 VA Heat Output: Idle 89 BTU/hr; at 1/8 power 311 BTU/hr; full power 382 BTU/hr
Dimensions (H × W × D): 450 × 250 × 361 mm Net Weight: 24.3 kg
The ATC SCM20ASL Classic is an active studio monitor known for its precision and clarity. Designed by the ATC team, with significant contributions from founder Billy Woodman, the design philosophy focuses on accurate sound reproduction without coloration. The cabinet is made of high-quality MDF with a veneer finish, designed for minimal resonance. The internal wiring uses oxygen-free copper for optimal signal integrity, while the drivers are manufactured in-house. ATC pays close attention to material selection, with a focus on durability and performance.
ATC was founded in 1974 by Billy Woodman in the United Kingdom. That same year, the company developed a 12-inch bass driver, the PA75-314, intended for professional applications. In 1985, ATC introduced a monitor loudspeaker with an in-house developed Soft Dome midrange unit. This was followed in 1989 by the brand's first complete loudspeaker, the SCM50A. In 1996, the brand developed a self-designed amplifier with completely discrete components. In 2000, the first digital converter (DAC) was presented. As of 2011, ATC produces its own tweeters in the United Kingdom. The entire range, including transducers, amplifiers and speakers, is designed and produced in-house. In 2013, the electronics division was expanded with new product lines. In 2015, ATC released an integrated amplifier. In 2022, the company introduced a new active loudspeaker, the SCM20A Pro Mk2, with improved amplification and components.
