QSC AcousticDesign AD-S4T 4" Two-Way Surface Mount Loudspeakers (Pair, Black)

QSC AcousticDesign AD-S4T 4" Two-Way Surface Mount Loudspeakers (Pair, Black)
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QSC AcousticDesign AD-S4T 4" Two-Way Surface Mount Loudspeakers (Pair, Black)

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QSC AD-S4T-BK Overview

This pair of black QSC AcousticDesign AD-S4T Loudspeakers 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.

4" Weather-treated woofer; 0.75" silk dome tweeter
120° Axisymmetric (conical) coverage
30W Low-saturation and low-loss 70/100V transformers with 8-ohm bypass
Maximum peak SPL 110 dB (8 ohm bypass)
DMT (Directivity Matched Transition) ensures smooth, uniform frequency response over the coverage area
X-Mount system enables the loudspeaker to be easily installed and deployed at a variety of angles
Lightweight ABS enclosure for durability
Sealed input panel cover and powder coated aluminum grille for added weather resistance
Meets IEC60529 IP-54 for dust and splash resistance
Suitable for foreground and background sound reinforcement applications in restaurants, retail, educational institutes, concourses, casinos, transportation terminals, places of worship, or as part of large system ancillary support
Complete EASE, CF2, CAD, and BIM information available online


Frequency Range68 Hz to 20 kHz
Noise RatingPower: 50 W
Voltage: 20 V rms
SensitivityBroadband: 87 dB SPL
Coverage AngleAt -6 dB: 120° (500 Hz to 5 kHz)
Directivity Factor6
Directivity Index8 dB
Maximum SPLContinuous: 104 dB
Peak: 110 dB
Rated Impedance8 ohms
Transformer Taps70 V: 30, 15, 7.5, 3.75 W and 8-ohm bypass
100 V: 30, 15, 7.5 W and 8-ohm bypass
High Frequency Transducer0.75" (1.9 cm) silk dome tweeter/0.75" (1.9 cm) voice coil, horn loaded
Low Frequency Transducer4" (100 mm) weather-resistant paper cone woofer / 1" (25 mm) voice coil
Input ConnectorEuroblock connector with parallel output terminals
Construction MaterialEnclosure: Painted ABS polymer
Grille: Powder-coated aluminum
X-Mount: Powder-coated aluminum
Ingress Protection RatingIP-54
Operating EnvironmentIndoor and outdoor use
TestingSalt Fog: MIL-STD-810G Method 509.5 for 100 hours
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 -4 to 122°F (-20 to 50°C)
Operating Temperature-4 to 122°F (-20 to 50°C)
Dimensions10.27 x 6.34 x 6.42" (261 x 161 x 163 mm)
Weight6.5 lb (2.9 kg)
Packaging Info
Package Weight16.5 lb
Box Dimensions (LxWxH)15 x 10 x 10"
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