The QSC AcousticDesign™ AD-S4T is a surface mounted 70/100V, 4.5" two-way loudspeaker system, ideally suited for a wide variety of foreground and background sound reinforcement applications. The AD-S4T features a high quality 100 mm [4 in] weather treated paper cone woofer on a 25 mm [1 in] voice coil.  A carefully selected 19 mm [.75 in] silk dome tweeter with a 19 mm [.75 in] voice coil perfectly matches the sensitivity and performance of the woofer for outstanding full-range reproduction. Consistent and even 120° axisymmetric (conical) coverage is achieved through DMT™ (Directivity Matched Transition), a QSC innovation which matches the directivity patterns of the woofer and the high-frequency waveguide at the crossover point.  The result is a coherent transition between transducers and improved off-axis response. The even, accurate frequency response of the AD-S4T is maintained even in 70/100V applications by use of a lowloss, low-saturation 30-watt transformer with selectable taps, including an 8Ω bypass. To preserve weather resistance, the rotary selector is located on the back of the enclosure, protected by a weather grommet.

AD-S4T Features

  • 4.5-inch weather treated woofer; 0.75-inch 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
  • X-Mount™ system enables the loudspeaker to be easily installed and deployed at a variety of angles with no slippage over time
  • Advanced voicing filter sets using QSC Intrinsic Correction™, available through either Q-SYS or CXD amplifier platform
  • Lightweight ABS enclosures offer long-term durability and lasting good looks
  • Sealed input panel cover and powder coated aluminum grilles for added weather resistance
  • Meets IEC60529 IP-54 for dust and splash resistance
  • Available in black (RAL 9011) or white (RAL 9010)

System Details

AD-S4T

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-inch silk dome tweeter / 0.75-inch voice coil, horn loaded

LF transducer

4.5-inch weather resistant paper cone woofer 1-inch / 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

List price: $220.00
Price: $220.00
SKU: AD-S4T
Catalog: 
In-Wall Speakers
Brand: 
QSC Audio
Dimensions: 19 in × 11 in × 16 in
Weight: 17 lb