JL Audio XDM200/2 (D class) marine power amplifier (2-channel).

The tiny XDM200/2 packs a serious full-range punch, delivering a staggering 100 watts per channel into 2 ohms (14.4V, 1% THD). 
The technology that makes this much power possible in such a compact chassis is our advanced NexD™ high-speed switching design, which permits full bandwidth Class D operation with extremely low distortion and remarkable efficiency.
Suitable for car or boat installations, the XDM200/2 is built with marine-grade materials and features an exclusive, dual-mode input filter for noise-free performance in boats or cars.
Automatic turn-on capability (via signal sensing or DC-offset sensing) is also onboard for easy factory system upgrades.
The XDM200/2 includes a 12 dB / octave filter which can be configured as a low-pass or high-pass filter and offers continuously variable cutoff frequency selection from 50-500 Hz. 
With the addition of an optional HD-RLC or MHD-RLC (water-resistant) remote level controller (each sold separately), the amplifier's level can be adjusted directly from the driver's seat or cockpit.