Overview

The SCM20SL Tower is ATC’s flagship 2-way floor-standing loudspeaker and is the ideal choice in modestly sized rooms, but where performance cannot be compromised. It is available in both passive and active bi-amplified versions, the SCM20PSLT and SCM20ASLT respectively.

Its sealed cabinet design ensures excellent timing, useful low frequency output below the cut-off and that the speakers can be placed relatively close to walls without excessive low frequency ‘boom’.

Both the mid-bass driver and tweeter are handmade by ATC. The bass driver is a 6”/150mm part with huge 3”/75mm voice coil and massive, long-gap (short-coil) motor assembly featuring ATC’s proprietary ‘SL’ motor technology. The tweeter is a 1”/25mm soft-dome part featuring a dual-suspension and very high energy 2.1 tesla motor. Together, they form the basis for an exceptional 2-way monitor loudspeaker capable of delivering outstanding resolution and musicality.

Driver integration withing the passive model is handled 2nd order crossover featuring oversize air-core inductors which are would in-house by ATC. Capacitors are all high voltage polypropylene film types and the input features heavy duty binding posts in a bi-wire configuration.

The active SCM20ASLT features an on-board ATC bi-amp pack featuring 2-way active crossovers and class A/B MOSFET power amps, delivering a total power output of 250W. The active crossovers superior accuracy and phase coherence, plus the removal of the lossy passive components between power amp and drivers deliver a level of performance that simply can’t be matched by competing passive designs.

The SCM20 cabinet is constructed to be heavy and inert, with bitumastic damping panels deployed at critical positions to minimise cabinet colouration. The cabinets are available in 10 different hand selected veneers; satin black/white painted finishes and also piano/white high gloss polyester.

Available Finishes

• Standard Veneers – Cherry, Walnut, Oak & Black Ash.
• Standard Paints – Satin Black, Satin White
• Premium Veneers (up-charge applies) – Rosewood, European Crown Cut Walnut, Pippy Oak, Burr Magnolia, Burr Poplar.
• High Gloss (up-charge applies) – Clear High Glossed Veneer, Piano Black, Piano White

Specifications

Active

• Drivers: LF ATC 6.5”/150mm Super Linear, HF ATC 1”/25mm Dual-Suspension ‘S-Spec’ Tweeter
• Amplitude linearity : 80Hz – 20kHz (+/-2dB)
• Cut-off frequencies : 55Hz – 25kHz (-6dB freestanding)
• Dispersion : +/-80° coherent horizontal, +/-10° coherent vertical
• Maximum continuous SPL : 108dB (per pair @ 1m)
• Dispersion: ±80° Coherent Horizontal, ±10° Coherent Vertical
• Max SPL: 108dB
• Crossover Frequency: 2.5kHz
• Connectors: Female XLR
• Active Crossover Filters: 2nd Order Linkwitz-Riley
• Amplifier Power Output: 200w LF, 50w HF
• Accessories Inc. (per pair): 2 x fabric wrapped grills, 8 x M8 x 1.25mm stand spikes and nuts.
• Cabinet Dimensions (HxWxD): 1023 x 239 x 365mm / 40.28 x 9.41 x 14.37″
• Weight: 40kg

Passive

• Drivers: LF ATC 6.5”/150mm Super Linear, HF ATC 1”/25mm Dual-Suspension ‘S-Spec’ Tweeter
• Amplitude linearity : 80Hz – 20kHz (+/-2dB)
• Cut-off frequencies : 55Hz – 25kHz (-6dB freestanding)
• Dispersion : +/-80° coherent horizontal, +/-10° coherent vertical
• Maximum continuous SPL : 108dB (per pair @ 1m)
• Crossover frequency : 2.5kHz
• Recommended Amplifier Power: 75 to 300 Watts
• Impedance : 8 Ohm (5.5 Ohm Min.)
• Connectors : 2 x Pairs Binding Posts/4mm Plugs – Bi-Wireable
• Accessories Inc. (per pair): 2 x fabric wrapped grills, 8 x M8 x 1.25mm stand spikes and nuts.
• Cabinet Dimensions (HxWxD): 1023 x 239 x 355mm / 40.28 x 9.41 x 13.98″