Sony's Xplod amps combine form and function in a mix that'll make your system look and sound great. On the outside, the sleek inverted heat sink keeps vital internal components running cooler and lasting longer. Removable terminal covers keep all the wire connections protected and out of sight for a clean-looking installation. Underneath the hood, the XM-D9001GTR mono amplifier delivers 550 watts to a single 4-ohm sub, or 900 watts to a pair of subs — plenty of power for even the most demanding subwoofers. Signal-sensing speaker-level inputs activate the amp automatically when it's connected to a factory radio, so there's no remote turn-on lead for you to install. You can adjust the frequency filter to tailor the signal going to your subs, while a bass boost adds extra punch to the lows. Preamp outputs simplify setup when it's time add another amp to your system. minimize