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SCM 20 ASL Limited Edition

The SCM20ASL Limited Edition is a 2-way active loudspeaker released to mark the beginning of ATC’s 50th Anniversary year. This exclusive new model, limited to just 150 pairs, packs ATC’s finest transducer engineering and active loudspeaker technology into a compact sealed cabinet, finished to exceptional standards.

The 2-way active stand-mount design is finished in a stunning high gloss lacquer in the ATC company dark blue. Complementing the cabinet, the front baffle is hand-upholstered in royal blue full-grain Napa leather by German leather specialists Eissmann. The exterior alloy components feature a silver anodised finish in striking contrast to the blue lacquer and leather of the cabinet and baffle. 

The SCM20ASL Limited Edition continues ATC’s philosophy of combining the best in-house loudspeaker drive units with matched on-board active amplification for optimal fidelity. The new model integrates a 2-way active system, previously only available in a floor standing model, into a smaller stand-mount cabinet. The SCM20ASL Limited Edition features ATC’s proprietary 150mm/6” ‘Super Linear’ Mid/Bass driver paired with a 25mm/1” ‘S-Spec’ dual-suspension tweeter.

The bass driver operates in a 20-litre sealed cabinet and power is provided by on-board class A/B MOSFET power amplifiers, capable of delivering 200W and 50W continuous power to the bass and HF drivers respectively. The loudspeaker crossovers are active, analogue 2nd order Linkwitz-Riley and an all-pass filter is included to optimise the phase response through the crossover region, resulting in far improved tonal balance and imaging.

Input to the loudspeaker is via balanced XLR, located on the rear panel and there are user controls for input sensitivity and low frequency shelf cut/boost.  The input sensitivity control allows the user to tailor the input gain to suit their source/pre-amplifier combination, resulting in more consistent performance.  The low frequency shelf control gives the user the option to subtly adjust the bass response to suit their room and/or their personal taste.  The speaker is supplied with a removable grille, wrapped in dark blue acoustically transparent cloth.

To support the SCM20ASL Limited Edition, a limited run of 20 of ATC’s new 12” active subwoofer, the C4 Sub Mk2 Limited Edition have been produced. These limited-edition subs feature a matching gloss blue cabinet, leather upholstered baffle and silver anodised amp hardware.   

ATC SCM 20 ASL LE Features:

• Compact sealed cabinet finished in high-gloss blue with leather upholstered baffle
• On-board ATC active 250W ‘Amp Pack’ module
• 2nd order Linkwitz-Riley active crossovers
• 2 x class A/B MOSFET amplifiers, 200W bass/mid & 50W high frequency
• User adjustable input sensitivity & bass shelf controls
• Matching subwoofer - C4 SUB Mk2 LE - available for extended bass response
• Hand-built in England
• 6 year warranty

Specifications

Acoustic Specifications
o Drivers: LF ATC 195mm Super Linear, HF ATC 25mm Dual-Suspension ‘S-Spec’ tweeter
o Bass/mid driver: 1 x 150mm/6”, SB75-150SL 8Ω
o High Frequency Driver: 1 x 25mm/1”, SH25-76S 6Ω
o Low Frequency Cut-off: 55Hz (-6dB, anechoic)
o High Frequency Cut-off: 25kHz (-6dB)
o Crossover Point: 2.2kHz
o MaxSPL: 108dB continuous, 114dB peak (per pair, IEC Weighted Pink Noise, 1m, anechoic)
o Sensitivity: +4dBu rev 95dBC (Bass Boost 0dB, Input Sensitivity 1V, Pink noise)

Electronic Specifications
o Balanced Input: 1 x Rear Panel Mounted Female XLR, pin 2 hot
o Input Impedance: 20kΩ (differential)
o Input CMRR: >60dB (10kHz)
o Input Sensitivity: 2.2dBu/1Vrms for full powerInput Sensitivity Control: -6dB switchable, -6dB variable. Total adjustment 2.2dBu/1Vrms to 14.2dBu/4Vrms
o Bass Shelf: -2dB to +3dB, switchable in 1dB steps
o Crossover Filters: 2nd Order Linkwitz Riley
o All-pass filter stage included in order to optimise the Phase response through the crossover region, resulting in superior tonal balance and imaging
o Amplifier type: Grounded Source MOSFET, class A/B, convection cooled
o Output Power: Bass 200W (8Ω), H.F. 50W (8Ω)
o THD+N: <0.0017%/-95dB (1kHz, 1dB below rated power, 90kHz BW)
o Frequency Response: <2Hz to >200kHz (-3dB)
o Limiter: ATC Active FET Momentary Gain Reduction
o Electronic amp protection: Amplifier d.c. offset and over-temperature (both indicated by rear panel LED)
o Mains Input: 220-230V or 115V, factory set. Please observe rear panel markings and labels!
o Power Consumption: Idle 26W/41VA, 1/8th Power 116W/161VA, Full Power 312W/398VA
o Heat Output: Idle 89BTU/hr, 1/8th Power 311BTU/hr, Full Power 382BTU/hr

Physical Specifications
o Net Weight: 27kg (per cabinet)
o Dimensions: 450 x 250 x 361mm. Handles add an additional 64mm to depth (see diagram)