The largest and most powerful model in ATC's Classic Series, the SCM150SL pairs a 15”/375mm bass driver with a substantially larger cabinet to deliver the deepest bass extension and the highest dynamic headroom in the range. It is the natural choice for large rooms and listeners who demand scale, authority and uncompromising musical reproduction.
With 2.7 times the cone area of the SCM50 driver, the 15”/375mm bass driver employed by the SCM150SL delivers controlled, rhythmic bass right down into the lowest audible octave, creating not only an audible experience but also a physical one for the listener. Mid- and high-frequencies are handled by ATC's proprietary 3”/75mm Superdome and 1” dual-suspension tweeter, which, just like the bass driver, are designed and engineered for the highest possible resolution and seamless integration.
Complementing the performance of the drive units is a substantial cabinet construction that is extensively braced and damped to suppress resonances and minimise colouration. The increased cabinet volume, optimised for the 15” driver, is key to the SCM150SL's effortless low-frequency extension, allowing it to reproduce the scale and impact of live music with ease. The cabinet is available in a wide selection of real-wood veneers, satin painted and gloss finishes (options shown below).
The SCM150SL is available in passive (SCM150PSL) and active (SCM150ASL) 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 burr magnolia veneer; other finish options are shown below.
The active SCM150ASL features an on-board 350W 3-way amplifier pack with balanced line input. Requiring only a source and pre-amplifier (or combined streaming pre-amplifier), it offers a remarkably simple route to full-range audio playback, capable of reproducing the scale, dynamics and impact of live music with exceptional accuracy.
Designed and manufactured by ATC, the amplifier pack is optimised specifically for the SCM150ASL drive units and incorporates a precision active crossover operating at line level. This architecture comprises a low-noise balanced input, a 3-way electronic crossover with all-pass filtering for optimum driver integration, and three dedicated class A/B power amplifiers, each directly coupled to an individual drive unit.
Compared to an equivalent passive system, the active configuration provides more precise control of each drive unit, improved timing accuracy, and greater consistency across a wide range of listening levels. The dedicated amplification also delivers exceptional bass control and increased dynamic headroom, enabling the SCM150ASL to realise the full performance potential of its 15” bass driver.
The active model is also available in a floor-standing cabinet format as the SCM150ASLT.
ACOUSTIC SPECIFICATIONS
Bass Driver: 1 x 15"/375mm, SB75-375SL 8Ω
Mid Driver: 1 x 3"/75mm, SM75-150S 16Ω
High Frequency Driver: 1 x 1"/25mm, SH25-76S 6Ω
Low Frequency Cut-off: 25Hz (-6dB)
High Frequency Cut-off: 25kHz (-6dB)
Matched Response: +/-0.5dB
Crossover Points: 380Hz and 3.5kHz
MaxSPL: 117dB
System Sensitivity: TBC
ELECTRONIC SPECIFICATIONS
Balanced Input: 1 x Rear panel mounted female XLR, pin 2 hot
Input Impedance: 20kΩ (differential)
Input CMRR: >TBC dB (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: 75kg / 165.3lbs
Speaker & Stand Dimensions (HxWxD): 1137 x 498 x 647mm / 44 23/32 x 19 9/16 x 25 15/32 inches (stands spikes add 25-40mm/1" - 1 3/5" to height)
Speaker Dimensions (HxWxD): 884 x 498 x 647mm / 34 27/32 x 19 9/16 x 25 15/32 inches
See datasheet for detailed dimensions.
The passive SCM150PSL combines the effortless scale and authority of ATC's largest Classic Series loudspeaker with the flexibility to partner it 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 proprietary air-cored inductors, selected for their extremely low distortion and freedom from magnetic hysteresis. Meticulous optimisation of the crossover ensures seamless integration between the three drive units to deliver not only the scale and impact of a musical performance but also the subtle details deep within a recording and a clear, precise stereo image. Connection is made via heavy-duty tripwire terminals.
Despite its exceptional output capability and extended low-frequency performance, the SCM150PSL is very easy to drive and combines effectively with a wide range of high-quality amplification, including ATC's own pre, power and integrated amplifiers. When partnered with suitable electronics, it is capable of reproducing music with outstanding scale, realism and emotional engagement.
The passive model is also available in a floor-standing cabinet format as the SCM150PSLT.
ACOUSTIC SPECIFICATIONS
Bass Driver: 1 x 15"/375mm, SB75-375SL 8Ω
Mid Driver: 1 x 3"/75mm, SM75-150S 16Ω
High Frequency Driver: 1 x 1"/25mm, SH25-76S 6Ω
Low Frequency Cut-off: 25Hz (-6dB)
High Frequency Cut-off: 25kHz (-6dB)
Matched Response: +/-0.5dB
Crossover Points: 380Hz and 3.5kHz
MaxSPL: 117dB
System Sensitivity: 91dB/W @1m
ELECTRONIC SPECIFICATIONS
Recommended Amplifier Power: >100W (8Ω)
Impedance 8Ω nominal / 5.6Ω minimum
PHYSICAL SPECIFICATIONS
Net Weight: 67kg / 147.7lbs
Speaker & Stand Dimensions (HxWxD): 1137 x 498 x 595mm / 44 27/32 x 19 9/16 x 23 15/32 inches (stands spikes add 25-40mm/1" - 1 3/5" to height)
Speaker Dimensions (HxWxD): 884 x 498 x 595mm / 34 27/32 x 19 9/16 x 23 15/32 inches
See datasheet for detailed dimensions.
