The Phoenix Gold ZXM500.1i is a mono Class-D mini amplifier intended for dedicated subwoofer installations where space is limited. It provides a compact solution for adding bass amplification to a vehicle audio system.

The design uses Class-D switching topology to maximise efficiency and minimise heat. The unit is intended for single-channel use with standard single-channel inputs and outputs; consult the manufacturer product page for exact power ratings, wiring diagrams and connection details.