In continuous production since 1988, the SCM50SL is one of ATC's most enduring and celebrated Hi Fi loudspeakers. Combining exceptional resolution, wide bandwidth, and effortless dynamic range, it has become a benchmark for music lovers seeking a deeply engaging and realistic listening experience in the home.
Every critical element of the SCM50SL is designed and manufactured in-house by ATC ― from the beautifully finished cabinetry to the drive units, crossovers and amplification. This engineering-led approach ensures the highest possible performance and a loudspeaker that will deliver great enjoyment for many years to come.
The 9” SL bass, 3” soft-dome mid-range and 1” soft-dome high-frequency drive units employed are ATC's premium components, engineered to minimise colouration and maximise dynamic range at the acoustic source. This integrated approach results in an elegant system design that delivers the most enjoyable experience to the listener.
Supporting the drive units is a heavily braced and damped cabinet, designed to suppress panel resonances and minimise colouration. Acoustically, the cabinet offers optimal low-frequency loading for he 9” SL bass driver yet integrates comfortably into a very wide range of rooms. The cabinets are available in a wide selection of hand-selected real-wood veneers, satin-painted and gloss finishes (options shown below).
The SCM50SL is available in passive (SCM50PSL) and active (SCM50ASL) versions, with the active model incorporating ATC's tri-amplified architecture, further elevating performance. Both Classic models are supplied with speaker stands and fabric wrapped grilles.
A floor-standing 'Tower' variant is also available, offering identical performance but in a floor-standing cabinet format.
The featured speaker above is finished in cherry veneer; other finish options are shown below.
The active SCM50ASL features an on-board 350W 3-way amp pack. Only a source and pre-amplifier (or combined source/pre-amp) are required to create a simple system capable of breathtaking performance.
The amplifier employed by the SCM50ASL is the result of years of R&D by ATC's engineering team and is precisely engineered and optimised to complement the SCM50ASL drive units. The system consists of a low-noise balanced input paired with a precision 3-way electronic crossover and three separate class A/B power amplifiers ― each dedicated to an individual drive unit.
Compared to an equivalent passive system, the active electronic crossover delivers superior timing and more precise level matching between drivers. The three dedicated power amplifiers deliver greater dynamic range and control, particularly at low-frequencies, bringing the listener a step closer to the original performance.
The active model is also available in a floor-standing cabinet format as the SCM50ASLT.
9”/234mm ATC 'SL' BASS DRIVER LOADED IN 50 LITRE VENTED CABINET.
3”/75MM ATC SUPERDOME MID-RANGE.
25MM/1" ATC 'S-SPEC' SOFT-DOME DUAL-SUSPENSION HF DRIVER.
ON-BOARD ATC ACTIVE 350W 'AMP PACK' MODULE.
BALANCED INPUT & 4TH ORDER LINKWITZ-RILEY ACTIVE CROSSOVERS.
USER ADJUSTABLE INPUT SENSITIVITY & BASS SHELF CONTROLS.
3 X CLASS A/B MOSFET AMPLIFIERS, 200W BASS, 100W MID & 50W HIGH FREQUENCY.
HAND-BUILT IN ENGLAND
6 YEAR WARRANTY
ACOUSTIC SPECIFICATIONS
Bass/mid driver: 1 x 9"/234mm, SB75-234SL 8Ω
Mid Driver: 1 x 3"/75mm, SM75-150S 16Ω
High Frequency Driver: 1 x 1"/25mm, SH25-76S 6Ω
Low Frequency Cut-off: 38Hz (-6dB)
High Frequency Cut-off: 25kHz (-6dB)
Matched Response: +/-0.5dB
Crossover Points: 380Hz and 3.5kHz
MaxSPL: 112dB
System Sensitivity: TBC
ELECTRONIC SPECIFICATIONS
Balanced Input: 1 x Rear panel mounted female XLR, pin 2 hot
Input Impedance: 20kΩ (differential)
Input CMRR: >75dB (at 10kHz)
Input Sensitivity: 2.2dBu/1Vrms (Re. full power)
Input Sensitivity Control: 0db, -3dB, -6dB, -9dB (via rear panel DIP switches)
Bass Shelf: 0dB, +1dB, +2dB, +3db (via rear panel DIP switches)
Crossover Filters: 4th Order Linkwitz-Riley
Amplifier Type: Grounded Source MOSFET, class A/B, convection cooled
Output Power: Bass 200W (8Ω), Mid. 100W (16Ω) H.F. 50W (8Ω)
THD+N: <0.0011% / -98dB (1kHz, 1 dB below rated power, 90kHz BW)
Frequency Response: <10Hz to>175kHz (-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 34W/51VA. 1/8th Power 149W/198VA. Full Power 345W/426VA
Heat Output: Idle 116BTU/hr, 1/8th Power 423BTU/hr, Full Power 495BTU/hr
PHYSICAL SPECIFICATIONS
Net Weight: 47.05kg/103.7lbs
Speaker & Stand Dimensions (HxWxD): 969x304x480mm / 38 1/8 x 11 15/16 x 18 7/8" (stands spikes add 25-40mm/1" - 1 3/5" to height)
Speaker Dimensions (HxWxD): 716x304x480mm / 28 3/16 x 11 15/16 x 18 7/8"
See datasheet for detailed dimensions.
The passive SCM50PSL offers the accuracy and realism that has become synonymous with ATC, along with the option to pair the speaker with an integrated or power amplifier of the owner's choice.
Its 3-way crossover network is hand-built by ATC using premium film capacitors and ATC's proprietary air-cored inductors, chosen for their absence of hysteresis and extremely low distortion. Connection to the crossover is made via heavy-duty tripwire terminals.
While ideally paired with ATC pre/power or integrated amplifiers, the loudspeaker's neutral fidelity, outstanding resolution, and modest load impedance ensure excellent compatibility with a wide range of high-quality electronics.
The passive model is also available in a floor-standing cabinet format as the SCM50PSLT.
ACOUSTIC SPECIFICATIONS
Bass Driver: 1 x 9"/234mm, SB75-234SL 8Ω
Mid Driver: 1 x 3"/75mm, SM75-150S 16Ω
High Frequency Driver: 1 x 1"/25mm, SH25-76S 6Ω
Low Frequency Cut-off: 38Hz (-6dB)
High Frequency Cut-off: 25kHz (-6dB)
Matched Response: +/-0.5dB
Crossover Points: 380Hz and 3.5kHz
MaxSPL: 112dB
System Sensitivity: 85dB/W @1m
ELECTRONIC SPECIFICATIONS
Recommended Amplifier Power: >100W (8Ω)
Impedance: 8Ω nominal / 5.6Ω minimum
PHYSICAL SPECIFICATIONS
Net Weight: 41.1kg/90.61lbs
Speaker & Stand Dimensions (HxWxD): 969x304x428mm / 16 3/16" / 38 1/8 x 11 15/16 x 16 13/16" (stands spikes add 25-40mm/1" - 1 3/5" to height)
Speaker Dimensions (HxWxD): 716x304x428mm / 16 3/16" / 28 3/16 x 11 15/16 x 16 13/16" (stands spikes add 25-40mm/1" - 1 3/5" to height)
See datasheet for detailed dimensions.
