Independent four channel integrated combined amplifier:
It has one click conversion function for three modes: 4.0, 2.2, and 2.1.
4.0 mode: Four channel full frequency capability,
2.2 Mode: Two full frequencies+two ultra-low frequencies,
2.1 Mode: Dual full frequency+bridge connection for high power ultra-low.
Front fixed push 12-15 inch full frequency, 2.2 mode rear drop push single 15-18 inch ultra-low, 2.1 mode rear single 18 inch - double 18 inch subwoofer