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The ADC-MR4 is a 6 piece package of mud ring brackets for the QSC Acoustic Design Series AD-C42T weather resistant ceiling speakers.


  • Wide Area Paging ∙ Background Music ∙ Distance Conferencing

    Reinforcement∙ Healthcare Facilities ∙ Concourses ∙ Transportation

    Terminals ∙ Ancillary Support in Larger Systems



    • High quality transducers provide

    exceptional clarity through the

    critical voice range.

    • Improved musicality often

    not seen in typical BGM class


    • Ported baffle for increased low

    frequency extension down to

    70 Hz.

    • Low saturation 70/100V

    transformers with 8 ohm bypass.

    • 4-pole Euroblock connector

    eases system wiring.

    • Advanced voicing via QSC

    Intrinsic Correction™, applied

    using the Q-SYS™ Platform or

    CXD Series amplifier platforms.

    • Available in black (RAL 9011) or

    white (RAL 9010)

    • Complete EASE, CAD & BIM

    information available online

    The QSC AcousticCoverage™ Series

    AC-S4T is a surface mounted 4” two-way

    loudspeaker with 70/100V transformer,

    suitable for a wide variety of audio/video

    conferencing reinforcement, voice paging

    and background music applications.

    AcousticCoverage™ Series is designed to

    offer integrators a cost effective solution for

    applications where voice reinforced

    coverage is of primary concern, while

    providing improved musicality often not

    seen in typical BGM class products.

    A high quality 100 mm [4 in] polypropylene

    cone transducer with butyl rubber surround

    and a 25 mm [1 in] aluminium dome

    tweeter offers pristine clarity through the

    critical vocal range for increased speech

    intelligibility. With 130 degrees of conical

    coverage, the AC-S4T reduces the number

    of loudspeakers required for even coverage

    in close proximity.

    The UV treated high impact ABS enclosure

    and ported baffle assembly has been

    optimally tuned for added musicality,

    creating low frequency extension down to

    70 Hz. To maintain this frequency

    response, the AC-S4T utilizes a 16-watt

    low-saturation and low-loss 70/100V

    transformer with varying selectable taps,

    including an 8Ω bypass.

    To further enhance performance and speed

    of install with optimum result, advanced

    voicing via QSC Intrinsic Correction™

    techniques are obtainable usingthe Q-SYS™

    Platform and in CXD Series amplifiers

    for a complete QSC systems solution.

    Installers will appreciate the 4-pole

    Euroblock connector for loop thru wiring,

    located on the rear of the enclosure.

    Eliminating the termination hassles of star

    topology wiring designs, the generous

    Euroblock of the AC-S4T can accept four

    18AWG pairs.

    The AC-S4T features brass inserts to

    accept the included yoke mount and is

    secured using the supplied thumb bolts.

    The grille is adorned with a spring loaded

    and rotatable logo for installation

    convenience in either horizontal or

    vertical deployments.

    The AC-S4T is available in white (RAL

    9010) or black (RAL 9011) to match

    complimenting QSC product families.

    The AC-S4T may also be painted to

    match any décor.

    To assist in successful systems integration,

    complete EASE, CAD, and BIM files are

    available for download online.

    Small format, surface mount


    AcousticCoverage™ Series


    AC-S4T Details

    1k 10k


    Frequency (Hz)

    500 2k 5k 20k







    Beamwidth (-6 dB) (deg)


    Beamwidth: Impedance / Frequence Response:

    Dimensions: Specifi