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 been announced. The third generation SCM7 and second gen. SCM11 are the first to employ ATC’s landmark SH25-76 tweeter, developed to satisfy the company’s long-established rigour in drive unit engineering.
Sharing technology with the renowned ATC soft domed mid-range drive unit, the new tweeter employs a 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 is said to ensure low distortion throughout its operating band and remove the need for ferrofluids.
A 5.5mm rigid alloy waveguide provides optimum dispersion, a flat on-axis frequency response and resonance-free operation.
New cabinets and systems
Establishing what is to be a new style for ATC’s most competitively priced range of loudspeakers, the new SCM7 and 11 have a curved cabinet construction. Braced and laminated for high rigidity and damping, the curved enclosures are available in real cherry or black ash veneer.
Each new model exhibits an impedance curve free from low values, presenting an easy load for amplifiers of 75 to 300 watts. The SCM7 and SCM11 are designed for optimum performance without the grille – although a full-length perforated metal grille, finished in anthracite grey to match the drive unit face plates, is supplied. According to ATC tradition, each model number represents internal cabinet volume in litres.
Third generation SCM7
ATC’s SH25-76 soft dome tweeter is joined by the company’s highly linear 125mm mid/bass driver. It features a 45mm soft dome a huge 3.5kg high-energy magnet system, which includes a 45mm flat wire voice coil, milled and formed by ATC. The magnet system and a doped fabric cone assembly contribute to the SCM7’s wide bandwidth, wide dynamic range and “convincing bass output” – from a seven litre cabinet.
Second generation SCM11
The new SCM11 features ATC’s SH25-76 with an ATC CLD 150mm mid-bass driver incorporating a 45mm soft dome. Constrained Layer Damping is a driver cone technology exclusive to ATC and has claimed advantages of reduced harmonic distortion between 300Hz and 3 kHz, an extended frequency response that eases constraints on the crossover filter slope, and improved off-axis response.
Available in Speptember the UK pricing is £810 for the SCM7 and £1200 for the SCM11.