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Bookshelf Speakers

ATC SCM19 v2 Bookshelf Loudspeakers

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Acoustic Transducer Company (ATC) just released the second generation SCM19 passive hi-fi, closed-box bookshelf loudspeakers, which use the company’s new SH25-76 25mm soft dome tweeter, updated bass/mid drivers and crossovers housed in a new curved laminated cabinet.

The configuration of 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 Ferro-fluids, 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, a flat on-axis frequency response and resonance-free operation. In addition, a unique dual suspension system suppresses rocking modes even at high power output levels.

New Cabinets and Systems
The SCM19 v2 benefit acoustically and aesthetically from a curved cabinet construction. The new cabinet design is braced and laminated for high rigidity and damping, the curved enclosures in real cherry or black ash veneer also impart a strong impression of handcrafted design quality. The systems improved crossovers feature metallized polypropylene capacitors, large air cored inductors and ceramic wire-round resistors offer superior power handling and clarity. The new model exhibits an impedance curve free from low values, presenting an easy load for amplifiers of 75 to 300 watts. The SCM19 is designed for optimum performance with the grill in place – although the difference in performance without the grill is minimal. The metal grille, finished in anthracite grey, fixes to the cabinet via hidden magnets. According to tradition, each model number represents internal cabinet volume in liters.

Second Generation SCM19
The new ATC SH25-76 soft dome tweeter is joined with the company’s highly linear 150mm mid/bass driver. It features an integrated 75mm soft dome – exceptional for its horizontal dispersion of mid-band frequencies – and a huge 9kg high-energy, ‘Super Linear’ magnet systems, which includes a 75mm diameter flat wire, under hung voice coil, meticulously milled and formed by ATC. The magnet system and a carefully weighted doped fabric cone assembly contribute to the SCM19’s wide bandwidth, impressive dynamic range and convincing bass output coupled with very low distortion as a result of the unique ‘Super Linear’ motor system.

Pricing and Availability
Exact pricing was not released. However, the first version of these speakers were sold for about $3,500 (USD) in 2006. But they are backed by ATC’s six-year warranty.

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