press release - ATC Loudspeakers

press release - ATC Loudspeakers
International Edition
2nd March 2016, 4 pages.
The SCM19AT system is an active version of the Company’s SCM19 award-winner, uniting proprietary, optimised
driver/amp pairings in a slender floor standing design…
ATC Loudspeaker Technology’s new SCM19 Active Tower speaker system will deliver the company’s reference-quality audio
from an elegantly curved floor-standing design, just 370mm wide and under a metre in height. Identical acoustically to ATC’s
award-winning passive SCM19 2-way system but utilising the 19 litre volume in a slim tower format, the SCM19AT combines
high aesthetic appeal with the widely acknowledged performance benefits of ATC active design to create a compelling speaker
proposition for music lovers.
The SCM19AT’s braced, sealed and curved multi-layer laminated cabinet, which is precision-finished in cherry or black ash
real-wood veneer, provides a rigid and optimally damped environment for the Company’s acclaimed SH25-76 soft dome
tweeter and 150mm Super-Linear mid/bass driver. Drive units are individually powered by an upgraded bi-amp pack (also
proprietary), comprising ATC’s discrete MOSFET Class A/B modules, providing 32W of continuous power to the HF section
and 150W to the bass.
SH25-76 Tweeter
Sharing technology with the renowned ATC soft domed mid-range drive unit, the 19AT’s tweeter employs a unique dual
suspension system, designed to suppress rocking modes even at high power output levels. The ATC configuration of a short
edge-wound voice coil in a long, narrow magnetic gap ensures exceptionally low distortion throughout the tweeter’s operating
band and removes the need for ferrofluids, which can dry out over time, compromising performance. A complex-shaped,
soft-domed diaphragm extends high frequency range and offers a smooth off-axis response. The tweeter’s 15,000 gauss (1.5
tesla) neodymium magnet has a black heat-treated top plate, which dissipates heat away from the voice coil to maintain high
power handling and low power compression. A precision-machined 5.5mm rigid alloy waveguide provides optimum dispersion
with a flat on-axis frequency response and resonance-free operation.
Bass Driver
The SCM19AT’s 150mm ATC SL mid/bass driver utilises a carefully weighted doped fabric cone with a 75mm soft dome exceptional for its broad and even dispersion of mid-band frequencies. The cone is driven by an ‘under-hung’ (short coil/long
gap) motor using a huge 9kg ‘Super Linear’ magnet system, which is unique to ATC loudspeaker systems. The 75mm ribbon
wire voice coil is meticulously milled and wound in-house by ATC. ATC’s familiar under-hung motor topology maintains linear
coil force and inductance, even at high drive levels, keeping distortion low.
The 19AT’s proprietary two-way on-board amp pack design has been revised to reduce noise and distortion (a further -10dB
@ 10kHz), while achieving a lower operating temperature for improved reliability. The design includes protection circuits for
both DC offset and thermal overload. Mid frequency THD is vanishingly low at 93dB/0.002%, and a very wide bandwidth of
200 kHz ensures the accurate reproduction of musical transients. ATC’s Grounded Source output stage modules are fed by a
newly developed two-way active crossover section featuring 2nd order modified Butterworth circuitry with phase
compensation for each crossover point. The advantage of active crossovers is that their response remains unaffected by
variable voice coil impedance, while the use of phase compensation enables phase coherency at the crossover points,
improving the SCM19AT’s tonal balance and enhancing imaging for a pin-point stereo field. As usual system input is via balanced
The ATC SCM19AT – the first active 19 in the Company’s history - is designed for optimum performance with the grille
attached, although the difference in performance without the grill is minimal. Finished in anthracite grey, the metal grille fixes
to the cabinet via hidden magnets. Designed and manufactured by ATC entirely in-house, the SCM19AT offers the ownership
of a hand-built ruggedly engineered speaker system, world famous for musical accuracy and high power output. Like all ATC
products, the SCM19AT is backed by a six-year warranty.
New ATC designed and built dual suspension 25mm soft dome HF unit with precision alloy wave guide
“SL” spec bass driver with 75mm integral Soft Dome
9kg optimised short-coil/long gap motor assembly
On-board grounded source 182 watt Class A/B Bi-amplifier
Active filters and overload protection
6 year warranty
Drivers: HF ATC 25mm dual suspension Tweeter, Mid/LF ATC 150mm SL
Matched Response: +/- 0.5dB
Frequency Response (-6dB): 54Hz-22kHz
Dispersion: ±80°Coherent Horizontal, ±10°Coherent Vertical
Max SPL: 108dB
Crossover Frequency: 2.5kHz
Connectors: Male XLR
Input sensitivity: 1V
Filters: 2nd Order critically damped with phase compensation
Overload Protection: Active FET momentary gain reduction
Fault Protection: DC fault protection and thermal trip. Fault indication on rear panel mounted LED
Amplifier Output: 150W LF, 32W HF
Cabinet Dimensions (HxWxD): 980x370x344mm (spikes add 25mm to height, grill adds 34mm to depth)
Weight: 31kg
The advantages of active operation:
Perfectly matched dedicated amplifiers for each frequency band
Active crossover filters with phase correction ensure accurate timbre, excellent imaging and source location
A flat magnitude response that is not changed with power input level
A 20dB improvement in intermodulation distortion
Better controlled low frequency
A greater dynamic range for the same input power
ATC Loudspeaker Technology SCM19AT
Price: please contact the local authorised ATC dealer or distributor in your region for pricing.
Availability: 23rd March 2016
ATC Clients
Artists and Composers:
Studios and Soundstages:
Engineers and producers:
Loudspeaker Technology Ltd (ATC), Gypsy Lane, Aston Down, Stroud, Gloucestershire GL6 8HR.
Tel: +44 (0)1285 760561
ATC products are manufactured by Loudspeaker Technology Ltd, UK. ATC is a registered trademark of Loudspeaker Technology Ltd. Acoustic Transducer
Company is a trading style of Loudspeaker Technology Ltd. All trademarks acknowledged
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