What Hi-Fi review ATC's curved SCM19 passive monitors
http://www.whathifi.com/atc/scm19/review
Featuring the new ATC designed and built 25mm soft dome tweeter, updated bass/mid drivers and crossovers housed in a curved, laminated cabinet, the first of a new range of ATC closed-box passive loudspeakers has arrived. The second generation
SCM19 employs ATC's landmark
SH25-76 tweeter, developed to satisfy the company's long-established rigour in drive unit engineering.
SH25-76 HF Unit
Sharing technology with the renowned ATC soft domed mid-range drive unit, the new tweeter employs a unique dual suspension system suppressing 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 its 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, a flat on-axis frequency response and resonance-free operation.
ATC SH25-76 HF Unit
New Cabinets and Systems
Establishing what is to be a new style for ATC's most competitively priced range of loudspeakers, the new
SCM19's benefit acoustically and aesthetically from a curved cabinet construction. 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. The
SCM19 exhibit 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 litres.
Second Generation SCM19
ATC's
SH25-76 soft dome tweeter is joined by 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 system, which includes a 75mm diameter flat wire, underhung 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.
ATC curved SCM19 passive monitors
ATC curved SCM19 passive monitors
ATC SB75-150 SL mid/bass drive unit used in curved SCM19 monitors
http://atcforums.co.uk/pdf/ATC CORP BROCHURE.pdf (ATC Corporate brochure)
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