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4" Two-way surface speaker, 70/100V transformer with 8ohm bypass, 130degree conical coverage, includes Yoke Mount. Available in black or white.  Sold in pairs.

The black AcousticCoverage Series QSC AC-S4T is a pair of transformer-equipped 4" surface-mount loudspeakers voiced to deliver enhanced clarity in the vocal range, making them suitable for 70/100V or 8-ohm operation in a variety of paging, A/V conferencing, and background music applications.

Outfitted with a 4" polypropylene woofer and a 1" aluminum dome tweeter in a UV-treated ABS enclosure with a ported baffle, the AC-S4T offers broad 130° conical coverage while providing a frequency range of 70 Hz to 20 kHz (-10 dB). The speaker is capable of handling 16W RMS and producing a peak maximum SPL of 103 dB.

The AC-S4T utilizes a 4-pole Euroblock connector on the rear panel for easy input and loop-thru wiring. A yoke bracket is included for simplified surface-mount installation.


  • High-quality transducers provide increased clarity through the critical voice range and improved musicality often not seen in typical BGM-class products
  • 4" polypropylene cone transducer with butyl rubber surround and 1" aluminum dome tweeter
  • 130° of conical coverage reduces the number of loudspeakers required for even coverage in close proximity
  • UV-treated, high-impact ABS enclosure and ported baffle assembly
  • Tuned for added musicality and low-frequency extension down to 70 Hz (-10 dB)
  • Low-saturation, low-loss 70/100V transformer with 8-ohm bypass and rear-panel tap selector
  • 4-pole Euroblock connector with loop-thru wiring located the rear of the enclosure
  • Advanced voicing filter sets using QSC Intrinsic Correction are available through either Q-Sys processing or CXD amplifier platforms (available separately)
  • Brand Name: QSC
  • Model Number: AC-S4T-BK
  • PAVS Item #: 178536
  • Series Name: AcousticCoverage Surface Series
  • UPC: 684284066848
Retail Package Measurements & Shipping Weights
Type Quantity Length (in) Width (in) Height (in) Weight (lb)
EACH 1 7.25 5.5 4 6
CASE 2 14 11.5 8.25 12