ATC's new curves

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ATC's new curves
Friday, November 22, 2013

Designed for small to medium scale stereo and multi-channel applications, two new models from ATC incorporate an in-house designed and built tweeter, and stylishly curved cabinets. The new ‘hi-fi’ passive series SCM19 and SCM40 loudspeakers feature the new 25mm soft dome tweeter, updated bass/mid drivers and crossovers, and a curved, laminated cabinet. ATC’s landmark SH25-76 tweeter was developed to satisfy the company’s long-established rigour in drive unit engineering. The new models join the new SCM7 and SCM11 to complete the new ATC Hi-Fi Passive Series line up.

Sharing technology with the renowned ATC soft domed mid-range drive unit, the SH25-76 tweeter employs a unique, dual suspension system suppressing rocking modes even at high power output levels. A short, edge-wound voice coil in a long, narrow magnetic gap ensures exceptionally low distortion throughout its operating band and removes the need for ferrofluids, which can dry out over time and compromise 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, a flat on-axis frequency response and resonance-free operation.

Braced and laminated for high rigidity and damping, the curved enclosures in real cherry or black ash veneer also impart a strong impression of design quality. Improved crossovers featuring metallised polypropylene capacitors, large air cored inductors and ceramic wire-round resistors offer superior power handling and clarity. Each new model exhibits an impedance curve free from low values, presenting an easy load for amplifiers of 75 to 300 watts. The SCM19 and SCM40 are designed for optimum performance with a metal grille, finished in anthracite grey, that fixes to the cabinet via hidden magnets. According to tradition, each model number represents internal cabinet volume in litres.

In the second generation SCM19 the SH25-76 soft dome tweeter is joined by the company’s highly linear 150mm mid/bass driver. This features a 75mm soft dome and a 9kg, high-energy, ‘Super Linear’ magnet system, which includes a 75mm flat wire voice coil that is meticulously milled and formed by ATC. The new SCM40 adds ATC’s renowned 75mm/3” soft dome mid-range and a 164mm short coil/long gap (under-hung) bass driver. The new model also benefits from crossover revisions that have improved the loudspeaker’s overall balance and mid-high frequency integration.

Pricing: SCM19 - £1,996; SCM40 - £3,275