DS18 X4 Ultra Compact Full Range Class D 4-Channel Car Amplifier 1320 Watts Max Micro amps are a great power solution for an audio enthusiast that doesn’t have a lot of room to spare for big bulky amps. In this case, you want to maximize your size to power ratio so you can get as much power you can with as little space as possible. DS18 now has the our newest micro amp, the X4