The QSC AD-S4T is a compact, 4.5" small format, high-performance surface-mount loudspeaker designed for clear, consistent coverage in commercial audio installations. Featuring DMT™ (Directivity Matched Transition), it delivers smooth, uniform frequency response across the listening area for natural and balanced sound reproduction.

The innovative X-Mount™ system allows for quick, secure installation at multiple angles without sagging or slippage over time. Built-in low-saturation 70/100V transformers with 8-ohm bypass provide flexible system integration, while advanced voicing filters with QSC Intrinsic Correction™ (when used with compatible Q-SYS processors or CXD amplifiers) optimize overall performance.

Constructed with a lightweight yet durable ABS enclosure, sealed input panel cover, and powder-coated aluminum grille, the AD-S4T meets IP54 standards for dust and splash resistance. Available in black or white finishes, it’s ideal for retail, hospitality, education, and other indoor or protected outdoor environments requiring reliable, professional sound.