Earthquake Sound Introduces the BTA-300 In-Wall Streaming Amplifier Earthquake Sound proudly introduces the BTA-300, a compact Class-D streaming amplifier that fits inside a standard single-gang electrical box. Operating safely from 12–24VDC, it simplifies installation for residential, hospitality, commercial, and outdoor applications. The BTA-300 features Bluetooth streaming, a front-panel 3.5 mm input, a rear CAT6 audio input, and programmable input priority for automatic source switching. Every unit includes an ABS installation back box and a 24VDC power supply. OEM and high- volume customers can request custom firmware to tailor source hierarchy and operating logic for specific applications, delivering affordable, intelligent multi-room audio.