QSC AD-S4T – 30W Wall-Mount Surface Speaker, 4.5-Inch, 70V/100V Transformer

•30 Watts at 8Ω nominal setting, 30/15/7.5W multi-tap at 100V
•Frequency Range (-10 dB)1 68 Hz – 20 kHz
•Nominal Sensitivity: 104 dB SPL @ 1 m (3.3 ft)
•Rated Maximum SPL 110 dB @ 1 m (3.3 ft), 16W tap
•4.5-inch weather treated woofer; 0.75-inch silk dome tweeter 120° conical DMT™ coverage
•Dimension 261 × 161 × 163mm

The QSC AD-S4T is a compact and professional-grade 30-watt surface-mount wall speaker, designed for clear and consistent audio in commercial environments. With a 4.5-inch full-range driver, it delivers balanced sound performance that suits background music, announcements, and paging systems in retail spaces, restaurants, corporate offices, and educational facilities.

Built for versatility, the AD-S4T supports both 70V/100V distributed audio systems and 8Ω low-impedance configurations, thanks to an integrated transformer with multiple tap settings. This allows seamless integration into various audio installations.

The speaker features a durable ABS enclosure, designed to withstand indoor and semi-outdoor conditions. The included mounting hardware allows for fast and flexible installation on walls and other flat surfaces, providing a clean and modern appearance while ensuring optimal sound coverage.

Backed by QSC’s reputation for quality and reliability, the AD-S4T is a trusted solution for small to mid-size commercial audio needs.

Feature	Details
Model	QSC AD-S4T
Type	Wall-Mount Surface Speaker
Power Handling	30W RMS / 120W Peak
Driver Size	4.5-inch full-range driver
Frequency Response	100 Hz – 20 kHz
Sensitivity	86 dB SPL (1W @ 1m)
Maximum SPL	102 dB Peak
Transformer Taps	30W, 15W, 7.5W, 3.75W (70V/100V)
Impedance	8Ω nominal (bypass mode)
Enclosure Material	ABS, weather-resistant
Mounting Hardware	Included steel wall-mount bracket
Color Options	Black or White
Dimensions (H x W x D)	Approx. 213 mm x 144 mm x 149 mm
Weight	Approx. 2.4 kg (5.3 lbs)
Applications	Retail, offices, classrooms, cafes, lobbies