Velleman 2x 30w audio power amplifier kit velleman k4003 the velleman audio power amplifier kit 2 x 30w is a small amplifier constructed with the tda2616 ic and a maximum supply capability of 2 x 15wrms 4 ohm of 2 x 10wrms 8 ohm the ic is protected against overheating and short circuits additional rectifier and smoothing filter are unnecessary because alternating current can be connected directly with the unit velleman k4003 audio power amplifier kit 2 x 30w