QSC AD-S4T-BK 4.5” Two-Way Surface Speaker – 70/100V Transformer with 8Ω Bypass, 120° DMT™ Coverage, Includes X-Mount™, Black (Sold Per Pair) (AD-S4T-BK)

QSC AD-S4T-BK 4.5” Two-Way Surface Speaker

(70/100V Transformer with 8Ω Bypass, 120° DMT™ Coverage, Includes X-Mount™, Black | Sold Per Pair)

The QSC AD-S4T-BK is a professional 4.5-inch 2-way surface-mount installation speaker designed for high-quality background and foreground audio in commercial environments. As part of the QSC AcousticDesign™ Series, it delivers excellent speech intelligibility, smooth frequency response, and wide, even coverage for distributed sound systems.

Built with DMT™ (Directivity Matched Transition) waveguide technology, the AD-S4T-BK provides a consistent 120° conical coverage pattern, ensuring uniform sound dispersion across listening areas with minimal drop-off. This makes it ideal for installations that require fewer speakers while still maintaining full-room coverage.

The speaker includes a 70/100V transformer system with 8Ω bypass mode, giving installers flexibility to use it in both distributed constant-voltage systems and standard low-impedance setups. It also comes with the QSC X-Mount™ system, allowing fast, secure, and adjustable wall or ceiling installation.

Key Features

• 4.5” 2-way surface-mount installation speaker (black finish)
• 70/100V transformer with 8Ω bypass for flexible system design
• 120° conical DMT™ coverage for wide, even sound distribution
• Designed for background and foreground music applications
• Part of QSC AcousticDesign™ Series for professional installs
• Includes QSC X-Mount™ bracket system for flexible positioning
• Smooth frequency response for clear speech and music reproduction
• Rugged enclosure designed for long-term commercial use
• Ideal for retail, restaurants, hotels, offices, and venues
• Sold per pair for stereo or multi-zone installations