Memphis Audio’s MXA4.45 4-channel amplifier will bring out the best in your marine or powersports audio system, with 45 watts RMS per channel driving your speakers. With that kind of juice, you’ll be able to hear your music over the wind and the roar with no trouble at all.

Despite the big performance, this compact amp will fit into a storage compartment on a boat, motorcycle, or ATV, and run cool no matter how hard you push it. Installing a pair of subs? You can bridge this amp to 2-channel mode and send 120 watts to each subwoofer, or switch to 3-channel mode to drive a pair of speakers and your sub. With variable high-pass and low-pass filters, plus bass boost, you can adjust the output to suit your tastes.

• 4-channel marine/powersports amplifier
• 45 watts RMS x 4 at 4 ohms (60 watts RMS x 4 at 2 ohms)
• 120 watts x 2 bridged at 4 ohms
• Class D amp technology
• variable high- and low-pass filters
• 10-gauge wiring kit (sold separately) recommended
• dimensions: 8-3/4″W x 1-13/16″H x 4″D