The HELIX M FOUR is a compact 4-channel Class D amplifier designed to drive front and rear speakers with high efficiency. It provides 4×100 Watts RMS per channel into 4 Ohms and 2 Ohms and can be configured as 3-channel or 2-channel bridged delivering up to 2×200 Watts RMS for bridged outputs.

Built with efficient Class D topology and SMD manufacturing, the M FOUR stays cool while offering features for modern vehicles including start-stop capability down to 6 V, ADEP high-level input with auto turn-on, 4 RCA inputs plus speaker-level inputs, and an integrated adjustable active crossover with highpass, lowpass and bandpass filters.