The SCM20SL Classic is ATC’s flagship 2-way stand-mount loudspeaker. Ideal for modestly sized rooms where performance cannot be compromised.
Its sealed cabinet design ensures precise timing and excellent low frequency output below the cut-off. The combination of ATC mid/bass and soft-dome tweeter delivers mid-range & high frequency of exceptional clarity and the driver component’s shared design philosophy ensures the parts work seamlessly together.
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 suppress resonance. Bitumastic damping panels are deployed at critical positions to minimise cabinet colouration. It is available in a wide range of finishes.
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.
ACOUSTIC SPECIFICATIONS
Bass/mid 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)
Crossover Point: 2.2kHz
MaxSPL: 108dB continuous, 114dB peak (per pair, IEC Weighted Pink Noise, 1m, anechoic).
Sensitivity: +4dBu rev 95dBC (Bass Boost 0dB, Input Sensitivity 1V, Pink noise).
ELECTRONIC SPECIFICATIONS
Balanced Input: 1 x Rear Panel Mounted Female XLR, pin 2 hot
Input Impedance: 20kΩ (dif ferential)
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. of fset 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. 1/8 Power 116W/116VA. Full Power 312W/398VA
Heat Output: Idle 89BTU/hr, 1/8 Power 311BTU/hr, Full Power 382BTU/hr
PHYSICAL SPECIFICATIONS
Net Weight: 27kgs/59.5lbs
Dimensions: HxWxD 450x250x425mm 17 11/16” x 9 13/16” x 14 3/16”
