CMX Audio A4 In-Wall Stereo Amplifier Module — 3.5" Capacitive Touchscreen, 4×30W, Bluetooth, USB/TF & FM (87.5–108 MHz), Rear Line-In

Compact in-wall stereo amplifier module featuring a 3.5″ capacitive touchscreen with an English-language interface for intuitive control. The internal stereo amplifier is rated at 4 × 30 W max and is designed to power up to four low‑impedance loudspeakers (4–8 Ω) in a single small zone. Connectivity includes 1× wired audio line input mounted on the rear PCB for hardwired sources, plus USB and TF (microSD) card playback and a built-in FM tuner (87.5–108 MHz). Wireless audio is supported via Bluetooth streaming from smartphones or tablets, with the Bluetooth device name and password configurable by the user for easier on-site setup. Tone controls offer adjustable Treble and Bass to shape the sound. The unit displays time with a selectable 12‑hour or 24‑hour format and supports scheduled playback with timed start/stop (“play/stop music”) functions. For installation, speaker, power and line‑input connections are provided on rear-mounted screw terminals suitable for flush mounting. Power is supplied from a universal mains input: AC 100-240 V (50/60 Hz).