QSC AC-S4T 4.5″ 2-way Surface mount speaker 130? conical for use with 70 or 100V or 8-ohm systems inc yoke Black or White (Pair)

Original price was: $638.00.Current price is: $574.20.

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The black AcousticCoverage Series QSC AC-S4T is a pair of transformer-equipped 4.5″ 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 exceptional clarity through the critical voice range.
  • Improved musicality often not seen in typical BGM class products.
  • 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 Q-SYS processing or CXD amplifier platforms.
  • Available in black (RAL 9011) or white (RAL 9010).
  • Complete EASE, CAD & BIM information available online.


Specifications AC-S4T
Effective frequency range1 70 Hz–20 kHz
Rated noise power / voltage2 16 watts / 11.3 volts rms
Broad-band sensitivity3 85 dB SPL
Coverage angle (-6 dB) 130° conical (500 Hz–5 kHz)
Directivity factor (Q) 6
Directivity Index 8 dB
Maximum continuous SPL4 97 dB
Maximum peak SPL4 103 dB
Rated impedance 8 ohms
Recommended amplifier power 32 watts into 8 ohms
Transformer taps 70V: 16, 8, 4, 2, 1 watts
100V: 16, 8, 4, 2 watts
8 ohm bypass
LF transducer 114 mm (4.5-inch) Polypropylene woofer with 25 mm (1-inch) voice coil
HF transducer 25 mm (1-inch) Aluminium dome tweeter with 25 mm (1-inch) voice coil
Input connector type Euroblock connector with parallel output
Enclosure material UV treated, high impact ABS polymer
Grille material Powder coated steel
Yoke material Powder coated steel with brass inserts
Enclosure Details

  • Ingress protection
  • Operating environment
  • Operating Temperature Range
Designed for indoor use
-20 to 50° C (-4 to 122° F)
Product Dimensions (HWD) inches 9.1 x 6.3 x 5.9
Product Dimensions (HWD) mm 230 × 160 × 150
Net Weight 5.3 lb / 2.4 kg
Shipping weight 5.3 kg (11.8 lb)
pair packed
Shipping Dimensions (HWD) inches 11.5 × 8.1 × 14.5
pair packed
Shipping Dimensions (HWD) mm 292 x 206 x 368
pair packed
Included accessories Yoke mount system, euroblock connector