ATC SCM20ASL
2-Way Active Stand-Mount Loudspeaker
The ATC SCM20ASL is a 2-way active stand-mount loudspeaker and is the ideal choice in modestly sized rooms where outstanding musical reproduction is the goal. Its sealed cabinet design ensures exceptionally well controlled bass, even in smaller spaces and/or when located close to walls. The bass driver, HF driver and amplifier are all designed and manufactured in-house by ATC and to the highest standards to form a system that can’t be matched by equivalent passive systems.
The bass driver is a 6”/150mm part with large 3”/75mm voice coil and short-coil (long-gap) motor assembly featuring ATC’s proprietary ‘SL’ motor technology which, reduces distortion in the upper bass and mid-range. High frequency reproduction is handled by an ATC 1”/25mm soft-dome part featuring a dual-suspension and very high energy 2.1 tesla motor.
Integrating the two drive units is a precision active crossover which feeds a pair of class A/B MOSFET power amplifiers. The crossover operates at line-level maximising efficiency, plus the inclusion of an all- pass-filter results in improved timing and tonal balance through the crossover region. One power amplifier is dedicated to each drive unit and their performance and power output is carefully tailored to the driver demands and the musical elements they reproduce.
The SCM20ASL cabinet features a combination of bracing for stiffness and damping to suppress resonance and is available in a wide range of real wood veneers, satin black or white painted finishes and high gloss lacquers.
ATC SCM20ASL Key Features
150mm/6” ATC ‘Super Linear mid/bass driver loaded in a compact sealed cabinet.
25mm/1” A TC ‘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.
ATC SCM20ASL Specifications
o Low Frequency Cut-off: 55Hz (-6dB, anechoic) o High Frequency Cut-off: 25kHz (-6dB)
o Amplitude Linearity: 80Hz – 20kHz (+/- 2dB) o Matched Response: +/-0.5dB
o Crossover Point: 2.2kHz
o Max SPL: 108dB continuous, 114dB peak (per pair, IEC Weighted Pink Noise, 1m, anechoic)
Electronic Specifications
o Balanced Input: 1 x Rear Panel Mounted Female XLR, pin 2 hot
o Input Impedance: 20kΩ (differential)
o Input Sensitivity: 2.2dBu/1Vrms for full power
o Input Sensitivity Control: -6dB switchable, -6dB variable. Total adjustment 2.2dBu/1Vrms to
14.2dBu/4Vrms
o Bass Shelf: -2dB to +3dB, switchable in 1dB steps
o Crossover Filters: 2nd Order Linkwitz-Riley
o Amplifier type: Grounded Source MOSFET, class A/B, convection cooled
o Output Power: Bass 200W (8Ω), H.F. 50W (8Ω)
o Mains Input: 220-230V or 115V, factory set. Please observe rear panel markings and labels!
Physical Specifications
o Net Weight: 24.3kgs/53.5lbs
Shipping Weights and Dimensions
o Gross Weight: 27.3kg / 60.1lbs.
o Carton Dimensions (LxWxH): 57 x 40 x 62.5cm / 22 1⁄2 x 15 3⁄4 x 24 1⁄2 inches.
Brand
ATC
ATC - Loudspeakers
Formed in 1974 by Billy Woodman to manufacture custom drive units for the professional sound industry.
ATC quickly made its mark with the 12″ PA75-314 driver, a design capable of handling more power and producing less distortion at a higher sound pressure level than any other unit on the market.
1976 saw the first production of the ground-breaking SM 75-150s soft dome midrange driver, a technical tour-de-force, whose innovative up-scaled design reproduced a more uniform dispersion, wider bandwidth and much lower distortion than was thought possible at the time.
It revolutionised studio monitoring and has since become recognised as the ultimate mid-range transducer for both domestic and professional applications.
Utilising exotic materials and precision tolerances, the latest version of the SM 75-150s represents the apex of drive unit technology. It is often copied but never equalled.
The next decade witnessed the introduction of complete speaker systems and further versions of the high power PA drive units used in OEM form by many leading manufacturers and performers – Pink Floyd and Supertramp were early customers.
During this period ATC researched and developed the first active system elements, introducing the EC23 Active Crossover with built in phase correction.
A contract with Danish Radio for an active portable monitor provided the opportunity to integrate the new SCM50 and SCM100 speakers with a Tri-amp pack and electronic crossover to create the industry standard SCM50A and SCM100A, the first reliable and accurate active systems. With regular fine tuning they remain as popular today in both professional and hi-fi applications.
With regular fine tuning they remain as popular today in both professional and hi-fi applications.
Having established a market for reference quality precision-made monitors, a succession of smaller ATC speakers then evolved, ranging from SCM7s through 10s and 20s. Available in both active and passive versions, they offered elite ATC performance and reliability to many new customers.
1996 welcomed the launch of ATC’s first stand alone audiophile electronics. Both SCA2 pre-amplifier, SPA2-150 power amplifier and later the SIA2-150 were built according to ATC’s no compromise philosophy, achieving performance figures that still rank as among the best available. In their latest versions they continue to offer unrivalled precision and performance.
In the same year Billy Woodman and his research team developed an innovative new driver topology designed to eliminate the effects of magnetic hysteresis as a significant source of distortion in loudspeaker drive units. Utilising a new material from the communications industry, ATC’s Super Linear (SL) driver reduced third harmonic distortion by 10-15dB between 100Hz and 3kHz. Arguably the most significant development in transducer design in the last 15 years, SL technology epitomises ATC’s commitment to sound quality.
The SL drivers’ accuracy in reproducing piano and male vocals remains unique.
Through ATC’s commitment to multi-channel mastering and its direct involvement with leading players in the professional audio industry including Sony Music and Telarc, ATC’s products are installed at some of the world’s most prestigious multi-channel studios and auditoria.
Where ever the best is required you will find ATC.
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