ATC LAUNCHES SCM19AT
UK-based ATC has released an active version of the SCM19 speakers, called the SCM19AT which uses unique, proprietary drivers in a slender, floor-standing design that is less than a metre high. The new ATC SCM19AT is acoustically identical to ATC’s award-winning passive SCM19 two-way system but uses the same 19-litre volume in a slim tower format, and has ATC’s discrete Class A/B MOSFET modules on board to individually power the two drivers: 150-watts continuous for the bass/midrange driver and 32-watts continuous for the tweeter. The bass/midrange driver is 150mm in diameter with a doped fabric cone to which is fixed a 75mm soft dome, a technique ATC says delivers exceptionally broad and even dispersion of mid-band frequencies. The cone is driven by an ‘under-hung’ (short coil/long gap) motor using a 9kg ‘Super Linear’ magnet in order to maintain linear coil force and inductance to keep distortion low, even at high drive levels. The 75mm-diameter voice coil is wound inhouse, using flat-wire ribbon that is also milled in-house by ATC.
The SH25-76 tweeter used in the SCM19AT is made in-house by ATC and shares technology with the renowned ATC soft-dome midrange drive unit, one example being the dual suspension system designed to suppress rocking modes at high power output levels. The tweeter’s movement is not damped by ferro-fluid, because ATC says that ferro-fluids dry out over time, which then compromises performance. The tweeter has a 1.5-Tesla neodymium magnet with a black heat-treated top plate to dissipate heat away from the voice coil to maintain highpower 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. ATC rates the frequency response as 54Hz–22kHz±3dB and says the maximum output capability is 108dBSPL.
The proprietary on-board amplifiers are fed by a newly-developed two-way active crossover section featuring 2nd-order modified Butterworth circuitry with phase compensation for each crossover, and the amplifiers have protection circuits for both d.c. offset and thermal overload. ‘ 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,’ said Aaron Tate, of Jag Imports, which distributes ATC’s domestic products in Australia. ‘ And as with all ATC products, the SCM19AT is backed by a six-year warranty.’ Available now, the ATC SCM19AT sells for $11,998 per pair (RRP). For further information, please contact Jag Imports on 1800 260 336 or visit the website at www.jagimports.com