ATC - USA SCM20ASLT Active Tower Speakers

ATC SCM20ASLT Active Floorstanding Speakers Key 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.
• ATC on-board active 250W ‘Amp Pack’ module.
• Balanced input & 2nd order Linkwitz-Riley active crossovers.
• 2 x class A/B MOSFET amplifiers, 200W bass/mid & 50W high frequency.
• User adjustable input sensitivity & bass cut/lift controls.
• Hand-built in England.
• 6-year warranty.
• Available in natural or gloss finish.

Product Description:

The active SCM20ASLT incorporates a dedicated 250W Amp Pack, requiring only a suitable pre-amplifier, DAC/pre, or streaming pre-amp to deliver exceptional performance.

By replacing the passive crossover and external power amplifier of a conventional system, the SCM20ASLT’s precisely matched rear-mounted Amp Pack ensures optimal integration. A balanced input feeds a 2nd-order active electronic crossover, which then drives a pair of class A/B power amplifiers—each engineered to meet the exact demands of the mid/bass and high-frequency drivers.

This active architecture provides superior control, accuracy, and dynamic range, with crossovers offering enhanced precision in both level and timing, and amplifiers directly coupled to the drive units for maximum responsiveness.

The cabinet is heavily engineered for rigidity and neutrality, combining internal bracing with targeted damping to suppress resonance. Bitumastic panels are strategically applied to further minimize cabinet coloration.

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 (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

30.2kg/66.6lbs

Dimensions

HxWxD 990x239x366mm 39” x 97/16” x 14 3/8”