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ATC SCM40A Active Floorstanding Speakers

ATC SCM40A Active Floorstanding Speakers
 ATC SCM40A Active Floorstanding SpeakersATC SCM40A Active Floorstanding Speakers 
(£6,458.33 Exc. VAT)
Rothwell Attenuators -10db:  

Available In 2-4 Weeks

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  • ATC designed and built dual suspension
  • ATC Soft Dome mid-range driver
  • ATC 164mm short coil bass driver
  • Massive optimised motor assemblies
  • 235 watt Class A/B Tri-amplifier
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ATC SCM40A 'Active' Floorstanding Speakers

The new active version of the SCM40 incorporates ATC designed and built drive-units powered by its pro-spec tri-amplifier pack.

Featuring 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. 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 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. Housed in a curved, laminated cabinet, the SCM40A is the first of the multi-award-winning ‘Passive’ Series speakers to be made active.

SH25-76 Tweeter
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

Soft Dome Midrange
ATC’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. 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. 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.

Bass Driver
The SCM40A’s 164mm bass driver utilises a hand-coated carbon-paper diaphragm driven by an ‘under-hung’ (short coil/long gap) motor and utilising a massive, optimised magnet assembly. In this application paper pulp is selected for the ideal balance of mass, damping and rigidity. The under-hung motor topology maintains linear coil force and inductance, even at high drive levels, keeping distortion low.

Amp Pack
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, 4th order modified Butterworth with phase compensation circuitry for each crossover point. Active crossovers have the advantage that their response is not modified by a loudspeaker’s variable voice coil impedance, and the phase compensation enables phase coherency at the crossover points, improving tonal balance and enhancing imaging for a pin-point stereo field.

New Cabinets
The SCM40A benefits acoustically and aesthetically from a curved cabinet construction braced and laminated for high rigidity and damping and finished in real cherry or black ash veneer to impart a strong impression of design quality. It is designed for optimum performance with the grille – 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 ATC tradition, the model number represents internal cabinet volume in litres.

Manufactured in-house, the SCM40A offers the ownership of a hand-built ruggedly engineered speaker, world famous for musical accuracy and high power output. Like all ATC products, the SCM40A is backed by a six-year warranty.

Available typically 2-4 weeks
  • New ATC designed and built dual suspension 25mm soft dome HF unit with precision alloy wave guide.
  • ATC Soft Dome mid-range driver.
  • ATC 164mm short coil bass driver.
  • All drive units incorporate massive optimised motor assemblies.
  • On-board grounded source 235 watt Class A/B Tri-amplifier.
  • Active filters and overload protection.
  • 6 year warranty.
  • Finish options cherry and black ash.
  • Drivers: HF ATC 25mm dual suspension Tweeter, Mid 75mm ATC Soft Dome, LF ATC 164mm SC
  • Matched Response:  ±0.5dB
  • Frequency Response (-6dB):  48Hz-22kHz
  • Dispersion:  ±80° Coherent Horizontal, ±10° Coherent Vertical
  • Max SPL: 112dB
  • Crossover Frequencies: 380Hz & 3.5kHz
  • Connectors: Male XLR
  • Input sensitivity: 1V
  • Filters: 4th Order critically damped with phase compensation.
  • Overload Protection: Active FET momentary gain reduction.
  • Fault Protection: DC fault protection and thermal trip. Fault indication on rear panel mounted LED.
  • Amplifier Output: 150W LF, 60W MF, 25W HF
  • Cabinet Dimensions (HxWxD): 980x370x344mm (spikes add 25mm, grill adds 34mm to depth)
  • Weight: 36kg
Average Rating (2 Reviews):  
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Honesty is the Best Policy
02 March 2024  | 

True to ATC form, these masterpieces deliver the goods without fanfare or slight of hand. They just keep you connected to the flow of sound, revealing layers of subtlety in there, bringing the music to glorious life.

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26 November 2023  | 

These are truly exceptional speakers and perhaps the best way to experience the ATC sound signature. They are substantial but not overly so,fairly easy to position. I spent a fair amount of time experimenting with distance from the wall,toe in etc. In reality the end position was similar to the starting position which was a minor compromise between living room aesthetic and pure sound quality. They are neutral but not clinically so,there is a nice blend between studio clarity and warmth that makes listening enjoyable,non fatiguing. Bass is tight,has a physical presence but it is the mids that separate these speakers from the pack. I would describe these as non genre specific,they sound as good playing rock music as they do classical. They do have to be played at a decent volume to enjoy the clarity and depth they offer,and they donít make poor recordings sound like anything other than poor recordings. Feed them a good quality source file and they sing. Mine are linked to a Gold Note streamer as a Roon end point and it is as good a combination as I can realistically afford. Customer service,advice,from Peter at Igloo was first class making the whole experience pleasurable. I will have many happy years with these speakers with no itch to upgrade,so an expensive investment that will prove to be a shrewd one.

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