ATC SCM40A (Active) Floorstanding Speaker


Active, world-beating version of the three-way ATC SCM40. Legendary soft dome midrange. Tight, articulate bass. Superb dynamics.

Drop shipped; normally ships in 3-5 business days

Ships to: US only

Sold as: pair of speakers

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About the product


The SCM40A  (Active) is ATCs lowest cost three-way active speaker. It incorporates the famous ATC soft-dome midrange with the new ATC soft dome and a 6.5" woofer. The cabinet features curved sides and the speaker is a sealed box.

Drive units are made in house:

  • 1" ATC soft dome featuring a 1.5 tesla neodymium magnet with dual suspension and no ferrofluid for long life.
  • World famous 3" soft dome midrange, providing low coloration, high power handling capacity and low power compression. The midrange drive incorporates a short coil / long gap configuration supported on dual suspensions.
  • 6.5" ATC mid / woofer featuring a short coil / long gap configuration

Each driver has it's own amplifier. The tweeter gets a 32W, the mid a 60W and the woofer a 150W. The crossover is phase compensated and input is via XLR.


    • Hi-Fi Plus. "The ATCs are full bandwidth speakers that have grip in the bottom end - the bass is deep, solid and, thanks to the active operation, tactile. It has a degree of solidity that makes everything feel like it’s in the room. I had a lot of fun with this system and it has reignited my enthusiasm for active speakers"
    • Positive Feedback. "ATC combine much of the dynamic characteristics of horn drivers, while leaving behind the shouty, cupped hands sound. They also show the immediacy and speed of electrostats, yet are able to play loudly and dynamically. Vocals are extraordinarily clear and clean - well recorded vocals have a clarity, immediacy and "speed" that few other cone driver brands have."
    • Tone Audio: "ATC’s long held reputation for accuracy is put on full display. Pick any number of popular classic recordings and the results are the same, spot-on pitch and tonal clarity."


    • Drivers: HF ATC 1" Neodymium Soft Dome, Mid ATC 3" Soft Dome, LF ATC 6.5"
    • Frequency Response (-6dB): 48Hz-22kHz
    • Sensitivity: 85dB @ 1W @ 1meter
    • Cabinet Dimensions (HxWxD): 38.6"x10.4"x11.8" (excl. plinth, grill adds 1.1" depth)
    • Warranty: 6 years

    Technical Docs

    Contact Us About This Product


    Nyal Mellor, Founder, Acoustic Frontiers

    • (415) 524-8741
    • Serving USA & Canada
    • Fairfax, Northern California, USA

    ask us a question about this product