ATC SCM45A Pro 3-Way Active Studio Monitor (Pair)
On permanent demo in our demonstration room so please call us to make an appointment.
The SCM45A Pro is a completely new design, yet shares many features with its smaller sibling, the highly-successful SCM25A Pro three-way, compact active loudspeaker. As a mid-size, three-way design that can be used in near- or mid-field positions, the SCM45A Pro perfectly fills a gap in ATC’s high-performance, professional active studio monitoring loudspeaker range. It has high output and delivers extended low frequency for its size — and all without compromising the overall balance for which ATC is so well known.
Like the SCM25A Pro, the new SCM45A Pro is an active three-way design with an unprecedented linear response across the critical midrange, as well as across the rest of the audible frequency range. In contrast to the SCM25A Pro, the SCM45A Pro features a second woofer for deeper bass response and increased SPL (Sound Pressure Level) capability, as well as ATC’s new proprietary dual-suspension tweeter — the first to be designed and built by the company, and the result of six years of research and development by ATC Managing Director Billy Woodman and R&D Engineer Richard Newman — for increased resolution in the top end.
“Anybody who knows ATC will recognise that we very rarely release a completely new loudspeaker model,” maintains Newman, before adding: “All of our products have a very long history, each evolving to become what they are today. The SCM45A Pro is especially exciting since not only is it a completely new addition to the range, but it’s also the first ATC three-way professional monitor to incorporate our new high-performance SH25-76S dual suspension tweeter. The SCM45A Pro also incorporates a new variant of our existing SB50-164 short-coil bass driver, which we designed and engineered specifically to operate in a parallel wired pair. Given that the efficiency of our three-way models is essentially set by the bass driver, the larger combined radiating area of the two 6.5-inch bass drivers increases system efficiency, putting less demand on each individual bass driver and reducing drive unit excursion for a given SPL and low frequency response. This results in further reduced non-linear distortions in the bass drivers’ 20Hz to 380Hz operating band. With the addition of our renowned hand-built, soft dome midrange and the new SH25-76S dual-suspension tweeter, the drive units in the loudspeaker constitute a formidable trio.”
Those drive units are powered by ATC’s proprietary active Tri – AmpPack, a three-channel discrete MOSFET Class A/B design with 150W, 60W, and 25W for the bass, mid, and high frequency ranges, respectively. Revealingly, the SCM45A Pro is physically symmetrical — not mirror imaged, and is suitably sized for placement on or behind a console meter bridge. It is ideally suited, therefore, to positioning as a centre speaker between other SCM45A Pros and also ATC’s acclaimed SCM50ASL Pro three-way active loudspeakers. “Every aspect of the loudspeaker has been laboured over — from the drive units and amplifier design to the cabinet,” concludes Newman. “The result is a compact, yet high-performance professional monitor worthy of taking its place in our professional monitor range.”
Features
- Proprietary ATC 25mm/1” Dual Suspension Super Tweeter
- ATC hand built 3”/75mm Soft Dome mid-range driver.
- 2 x ATC hand built 6.5”/164mm carbon-paper cone bass drivers.
- On-board grounded source 235 watt Class A/B Tri-amplifier.
- Compact size with high output and low cut-off frequency.
- 6 year warranty.
Specifications
- drive units bass: 1 x 6.5″/164mm short-coil carbon-paper cone
- mid: 3″/75mm Soft dome
- hf: 1″/25mm Soft dome
- amplitude linearity 70Hz – 17kHz (+/-2dB)
- cut-off frequencies 42Hz – 25kHz (-6dB freestanding)
- horizontal dispersion +/-80° coherent
- vertical dispersion +/-10° coherent
- maximum continuous SPL 112dB (per pair at 1m)
- audio input rear panel mounted female xlr (pin 2 +)
- input sensitivity 1V rms (ref. full output)
- input sensitivity trim 0dB to -6dB (continuously variable)
- input impedance balanced >10kΩ
- amplifier output power bass: 150W rms
- mid: 60W rms
- hf: 25W rms
- crossover frequencies 380Hz & 3.5kHz
- crossover filters 4th order critically damped with phase compensation
- low frequency boost 0dB to +3dB at 40Hz (continuously variable)
- overload protection active FET momentary gain reduction
- mains power requirements 115/230V, 50/60Hz via rear panel switch. 100v 50/60Hz factory set
- mains power consumption 56VA (standby max), 154VA (typical 1/8th power), 375VA (max)
- thermal output 53W (idle), 130W (1/8th power)
- weight 36kg/79lbs