Rockford Fosgate P16 Marine Subwoofer Source Units use the M400/4 by itself

use the M400/4 by itself to power two satellites

Innovative technologies allow the T1D412 Power subwoofer to perform like a larger woofer over the previous model

5 dB @ 1 W / 1 m System Nominal Impedance 4 ohms System Frequency Response 55 Hz - 25 KHz ± 3 dB

Other Specs:

Bluetooth Control: With Bluetooth connectivity it’s easy to control your music and take your playlist with you no matter where you go

Rockford Fosgate P16 Marine Subwoofer Source Units use the M400/4 by itselfThe P16 is a 6 2 way shallow full range speaker rated at 55 watts RMS designed for fanatics needing a factory replacement driver. Package includes two speakers with grilles, integrated high pass crossovers and mounting hardware. Sold in pairs (2 each). Fanatics that need a great sounding speaker to replace factory installed garbage will certainly benefit from this Punch series full range speaker. The P16 offers a Flex Fit basket to ensure