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QSC AcousticDesign AD-S4T 4" Two-Way Surface Mount Loudspeaker (Black) - AD-S4T-BK by QSC

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Discontinued: Item is discontinued and no longer available to purchase

Quick Overview

  • 4” weather treated woofer; 0.75” silk dome tweeter
  • 120° conical DMT coverage
  • 30 watt low-saturation and low-loss 70/100V transformer with 8Ω bypass
  • Maximum peak SPL 110 dB (8 ohm bypass)
  • DMT™ (Directivity Matched Transition) ensures smooth, uniform frequency response over the coverage area
  • Priced individually, must be purchased in pairs.
QSC AcousticDesign AD-S4T 4" Two-Way Surface Mount Loudspeaker (Black) is available for purchase in increments of 2


QSC AcousticDesign AD-S4T 4" Two-Way Surface Mount Loudspeaker (Black) 

The black QSC AcousticDesign AD-S4T Loudspeaker is a surface mounted 70/100V, 4" two-way loudspeaker system, ideally suited for a wide variety of foreground and background sound reinforcement applications. The AD-S4T features a high-quality 4" weather-treated paper cone woofer on a 1" voice coil. It also has a 0.75" silk dome tweeter with a 0.75" voice coil. The consistent and even 120° axisymmetric (conical) coverage is achieved through DMT (Directivity Matched Transition), which matches the directivity patterns of the woofer and the high-frequency waveguide at the crossover point. The even and accurate frequency response of the AD-S4T is maintained even in 70/100V applications by use of a low-loss, low-saturation 30W transformer with selectable taps, including an 8-ohm bypass. The rotary selector is located on the back of the enclosure, protected by a weather grommet. Featuring a rugged ABS enclosure, sealed input panel cover, and powder-coated aluminum grille, the AcousticDesign surface-mounted speaker exceeds IEC60529 IP-54 ratings for dust and splash resistance.

The two-way surface-mount loudspeaker includes the X-Mount system for easy installation. Knurled surfaces at the pivot planes ensure the load will not drift or sag over time. Articulation marks allow pre-configuration of the X-Mount while on the ground with no special tools required. Voicing filter sets using QSC Intrinsic Correction techniques are obtainable via Q-Sys networked audio processing platforms, including CXD amplifiers (sold separately). For your system integration needs, complete EASE, CF2, CAD, and BIM files are available for download on the QSC website.

Additional Information

Effective frequency range1 68 Hz - 20 kHz
Rated noise power / voltage2 50 watts / 20 volts (rms)
Broadband sensitivity3 87 dB SPL
Coverage angle (-6 dB) 120° conical DMT
Directivity factor (Q) 6
Directivity Index 8 dB
Maximum continuous SPL4 104 dB
Maximum peak SPL4 110 dB
Rated impedance 8 ohms
Recommended amplifier power
(loudspeaker "program" power)
100 watts
Transformer taps 70 V: 30, 15, 7.5, 3.75 W and 8Ω bypass

100V: 30, 15, 7.5 W and 8Ω bypass
HF transducer 0.75” silk dome tweeter / 0.75” voice coil, horn loaded
LF transducer 4” weather resistant paper cone woofer

1” / 25 mm voice coil
Input connector type Euroblock connector with parallel output terminals
Enclosure material Painted ABS polymer
Grille material Powder coated aluminum
X-Mount material Powder coated aluminum
Enclosure Details
Ingress protection IP-54
Operating environment Designed for indoor and outdoor use
Testing The AD Series loudspeakers qualified for outdoor use using the following tests:

  • Salt fog: MIL-STD-810G Method 509.5 for 100 hrs.
  • Humidity: MIL-STD-810G Method 507.5, Natural cycle B2, cyclic high RH for 7 days
  • High and low temperature: tested to QSC internal standards between -20° and 50° C
Net weight 6.5 lb / 2.9 kg
Product dimensions 
(HWD) inches
10.3 × 6.34 × 6.42
Product dimensions 
(HWD) mm
261 × 161 × 163
Shipping weight 16.8 lb / 7.65 kg (pair packed)
Shipping dimensions 
(HWD) inches
15.5 × 10.3 × 18 (pair packed)
Shipping dimensions 
(HWD) mm
394 × 261 × 458 (pair packed)
Included accessories X-Mount mounting system, Euroblock connector,
input panel cover
Stock Status In Stock / Ships in 1 Hour
Condition New
Brand(s) QSC
Upc Number 684284066534
Mfr Part No AD-S4T-BK
Dimensions 10.3 × 6.34 × 6.42

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Return Info


15 Day Return Policy Ateksis USA Corp, (, is dedicated to bring you the best in professional audio and video.If you are not completely satisfied with a product for any reason, please contact our customer care team. We are happy to go over your concerns and talk about the best way to get the most out of your purchase.

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