The QSC AcousticDesign AD-CI52T is a professional-grade in-ceiling speaker pair engineered for high-fidelity background music, paging, and distributed audio applications. It features a compact, sealed 2-way enclosure design centred around: 

- A 5.25″ (133 mm) weather-resistant low-frequency woofer, with a low-distortion fiberglass cone, 25 mm voice coil and rubber surround. 

- A 1″ titanium dome tweeter with a neodymium magnet structure for clear, detailed high frequencies. 

- A frequency response down to approx. 85 Hz (-6 dB), usable down to about 65 Hz (-10 dB), extending up to 20 kHz. 

- Output capability up to around 102 dB SPL continuous and approx. 108 dB SPL peak at 1 m in half-space. 

- An 8 Ω nominal impedance in bypass mode, plus a multi-tap 70/100 V transformer for distributed audio (taps of 30W, 15W, 7.5W, 3.8W) with 8 Ω bypass switch. 

- A 90° nominal coverage pattern (conical) for wide dispersion in ceiling mounts.