Skip to product information
1 of 3



The black AcousticDesign Series QSC AD-S4T is a pair of transformer-equipped 4.5" surface-mount loudspeakers supplied with award-winning X-Mount systems, making them suitable for 70/100V or 8-ohm operation in a variety of foreground and background music applications, whether installed in horizontal, vertical, wall, or ceiling deployments.

Outfitted with a 4.5" weather-treated woofer and a 0.75" silk dome tweeter on a DMT waveguide, the AD-S4T offers even 120° conical coverage and improved off-axis response while providing a frequency range of 68 Hz to 20 kHz (-10 dB). The speaker is capable of handling 50W RMS and producing a peak maximum SPL of 110 dB.

The AD-S4T utilizes a 4-pole Euroblock connector under a sealed input cover for easy wiring and protection from moisture. Featuring a rugged ABS enclosure and a powder coated aluminum grille, the AD-S4T boasts dust and splash resistance beyond IP54 ratings for worry-free operation indoors or outside.

More Information


  • 1.5 x 2 core Cable is our Installation range of Speaker Cables.
  • These Vasiform Series Installation Speaker Cables are specifically designed to deliver maximum performance without taking much space in conduit.
  • They offer true audiophile performance for accurate sound transmission with crystal clear response, yet posses a rugged design to cater to most demanding applications.


  • Each conductor is dipped in a tinned bath to make the ATC conductors and is bunched tightly to give the best performance.
  • Twisted cores help in rejecting crosstalk.
  • Cable Ruggedness & toughness helps the cable to be pulled in long runs of conduits.


  • Installation of Speaker signals in Auditoriums, Schools, Shopping Malls etc.


  • 100 Meters Coil
  • 300 Meters Coil

Technical Specification


QSC AD-S4T Specs
Active or Passive Passive
Number of Included Speakers 2
Speaker Configuration 2-Way
Power Handling For 2 Hours / At Low-Z:
50 W RMS
Recommended Amplifier Power 100 W
Constant Voltage / Transformer Taps 70 V:
30 / 15 / 7.5 / 3.75 W or 8 Ohms Bypass

100 V:

30 / 15 / 7.5 W or 8 Ohms Bypass
Impedance 8 Ohms (Transformer Bypassed)
Transformer Wattage 30 W
Enclosure Type Sealed
Shielded No
HF Driver 1 x 0.75" / 1.91 cm Horn-Loaded Silk Dome Tweeter
HF Voice Coil 0.75" / 1.91 cm
LF Driver 1 x 4.5" / 11.43 cm Paper Woofer
LF Voice Coil 1" / 2.54 cm
Frequency Range 68 Hz to 20 kHz -10 dB
Maximum SPL 104 dB (Continuous)
110 dB (Peak)
Sensitivity 87 dB SPL
Coverage Angle 120° (Conical)
Directivity 6 (Directivity/Q Factor)
8 dB (Directivity Index)
Maximum Input Voltage 20 V RMS
I/O 1 x Block 4-Pole Speaker Input/Thru (Removable)
Water / Weather Resistance Dust Resistant, Humidity Resistant, Water Resistant
IP Rating IP54
Operating Temperature -4 to 122°F / -20 to 50°C
Color Black
Mounting 1 x Bracket Point (Rear)
Construction Material ABS, Aluminum Grille, Polymer
Dimensions 10.27 x 6.42 x 6.34" / 26.09 x 16.31 x 16.1 cm
Weight 6.5 lb / 2.9 kg (Each Speaker)
View full details