AliceFeaturing ATC designed and built drivers and amplifiers, the SCM40A system is an active version of the SCM40 three-way floor standing speaker.
The SCM40A utilises ATC’s 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 drivers are powered individually by a proprietary ATC tri-amplifier pack, upgraded from the version employed by the Pro SCMA 25 monitor.
Sharing technology with the 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 tweeter’s 15,000 gauss (1.5 tesla) neodymium magnet has a black heat-treated top plate that dissipates heat away from the voice coil to maintain high power handling and low power compression.
ATC’s 75mm mid-range dome is the latest version of the SM 75-150 soft dome midrange driver introduced by ATC in 1976.
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.
Meanwhile, SCM40A’s 164mm bass driver utilises a hand-coated carbon-paper diaphragm driven by an ‘under-hung’ (short coil/long gap) motor, utilising a large optimised magnet assembly.
Meanwhile, the on-board discrete Mosfet class AB three-channel amplifier utilising ATC’s Grounded Source output stage delivers 25W to the HF driver, 60W to mid and 150W to the bass driver for a total of 235 watts continuous power. Input is via balanced XLR.
The crossovers are all active, fourth order modified Butterworth with phase compensation circuitry for each crossover point and the SCM40A is backed by a six-year warranty.