![]() ![]() ATC’s unique doping formula offers an excellent balance of high damping and low mass, which make it ideal for suppressing energy from undesirable diaphragm resonances. It uses a hand-doped acrylic diaphragm, dual suspension system and a highly linear drive system to deliver uniform dispersion, wide bandwidth and low distortion. A precision-machined 5.5mm rigid alloy waveguide provides optimum dispersion, a flat on-axis frequency response and resonance-freeĪTC’s iconic 75mm mid-range dome is the latest version of the ground-breaking SM 75-150 soft dome midrange driver introduced by ATC in 1976. 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. 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.Ī complex-shaped, soft-domed diaphragm extends high frequency range and offers a smooth off-axis response. ![]() 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. Housed in a curved, laminated cabinet, the SCM40A is the first of the multi-award-winning ‘Passive’ Series speakers to be made active. The drivers are powered individually by a proprietary ATC tri-amplifier pack, upgraded from the version employed by the established and successful Pro SCMA 25 monitor. The SCM40A utilises ATC’s remarkable soft dome dual-suspension SH25-76 tweeter together with the company’s signature 75mm soft dome mid-range and a 164mm short coil/long gap (under-hung) bass unit. The new active version of the SCM40 incorporates ATC designed and built drive-units powered by its pro-spec tri-amplifier pack.įeaturing wholly ATC designed and built drivers and amplifiers, the new SCM40A system is an active version of the SCM40 three-way floor standing speaker, launched in late 2013. ATC SCM40A 'Active' Floorstanding Speakers ![]()
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