ATC SCM20ASL

SCM20ASL | ACTIVE

The active SCM20ASL features an on-board 250W Amp Pack. Simply pair with a suitable pre-amplifier, DAC/pre or streaming-pre-amp for stunning results.

The active SCM20ASL replaces the passive crossover and the driving amplifier of a 'conventional' system with a precisely matched 'Amp Pack', mounted to the rear of the loudspeaker cabinet. The electronic system consists of a balanced input feeding a 2nd order active electronic crossover which, in turn, feeds a pair of class A/B power amplifiers, carefully tailored to the exact requirements of the mid/bass and high-frequency drive units.

The active crossovers deliver greater precision in both level and timing and the two power amplifiers directly coupled to the drive units result in an improvement in control and dynamic range vs a passive system.

The cabinet is constructed to be heavy and inert with a combination of bracing for stiffness and damping to supress resonance. Bitumastic damping panels are deployed at critical positions to minimise cabinet colouration. It is available in a wide range of finishes.

The SCM20ASL is also available as a floor-standing 'tower' model with identical performance in the form of the SCM20ASLT.

FEATURES

 150mm/6" ATC 'Super Linear mid/bass driver loaded in a compact sealed cabinet.

25mm/1" ATC 'S-Spec' soft-dome dual-suspension HF driver.

On-board ATC active 250W 'Amp Pack' module.

Balanced input & 2nd order Linkwitz-Riley active crossovers.

User adjustable input sensitivity & bass shelf controls.

2 x class A/B MOSFET amplifiers, 200W bass/mid & 50W high frequency.

Hand-built in England.

6 year warranty.

SPECIFICATION

ACOUSTIC SPECIFICATIONS

Mid/Bass driver: 1 x 150mm/6", SB75-150SL 8Ω

High Frequency Driver: 1 x 25mm/1", SH25-76S 6Ω

Low Frequency Cut-off: 55Hz (-6dB, anechoic)

High Frequency Cut-off: 25kHz (-6dB) Matched Response: +/-0.5dB Crossover Point: 2.2kHz MaxSPL: 108dB continuous, 114dB peak (per pair, IEC Weighted Pink Noise, 1m, anechoic).

System Sensitivity: 85dBC SPL (@1m, pink noise, -18dBu, 1V input sens. 0dB bass boost).

ELECTRONIC SPECIFICATIONS

Balanced Input: 1 x Rear Panel Mounted Female XLR, pin 2 hot Input Impedance: 20kΩ (differential)

Input CMRR: >60dB at (10kHz)

Input Sensitivity: 2.2dBu/1Vrms for full power Input Sensitivity Control: -6dB switchable, -6dB variable. Total adjustment 2.2dBu/1Vrms to 14.2dBu/4Vrms

Bass Shelf: -2dB to +3dB, switchable in 1dB steps Crossover Filters: 2nd Order Linkwitz Riley

Amplifier type: Grounded Source MOSFET, class A/B, convection cooled

Output Power: Bass 200W (8Ω), H.F. 50W (8Ω) THD+N: <0.0017%/-95dB (1kHz, 1dB below rated power, 90kHz BW) Frequency Response: <2Hz to >200kHz (-3dB)

Limiter: ATC Active FET Momentary Gain Reduction

Electronic amp protection: Amplifier d.c. offset and over-temperature (both indicated by rear panel LED) Mains Input: 220-230V or 115V, factory set. Please observe panel markings and labels!

Power Consumption: Idle 26W/41VA. 1/8th Power 116W/116VA. Full Power 312W/398VA

Heat Output: Idle 89BTU/hr, 1/8th Power 311BTU/hr, Full Power 382BTU/hr

PHYSICAL SPECIFICATIONS

Net Weight: 24.3kgs/53.6lbs

Dimensions: HxWxD 450x250x411mm 17 11/16" x 9 13/16" x 16 3/16"

CABINET FINISHES

• Black Ash
• Burr Magnolia
• Cherry
• European Walnut
• Oak
• Pippy Oak
• Rosewood
• Satin Black
• Satin White