The QSC AC-C4T is a four-inch two-way ceiling loudspeaker engineered for high-quality distributed audio in professional commercial installations. Part of the Acoustic Coverage series, it is designed to deliver clear, intelligible sound for background music and voice paging in spaces such as retail stores, restaurants, offices, and hospitality environments. Its key innovation is the proprietary Acoustic Coverage technology, which utilizes a carefully designed asymmetrical waveguide to provide a broad, rectangular coverage pattern, allowing for more uniform sound distribution with fewer speakers and reduced overlap compared to conventional conical-dispersion ceiling speakers.

The loudspeaker features a coaxial driver design where the high-frequency component is positioned at the center of the low-frequency cone, ensuring precise acoustic alignment and a coherent wavefront for improved sound quality. The grille assembly is magnetically attached, facilitating easy removal for installation and painting, and the low-profile, paintable trim ring allows the speaker to blend discreetly into the ceiling. The enclosure is constructed from moisture-resistant composite material, making it suitable for use in damp indoor locations.

Installation is streamlined with a tool-free, drop-in mounting system that secures the speaker into standard T-bar ceilings quickly and securely. The AC-C4T includes a multi-tap transformer, offering flexible integration into 70V or 100V constant-voltage systems with several power tap settings, as well as direct 8-ohm low-impedance operation. This combination of advanced acoustic design, installation simplicity, and commercial-grade construction makes it an efficient and effective choice for modern commercial sound systems.