Sony designed the Slim Series XM-1S amplifier for small vehicle installations, with a low profile that allows it to fit under most front seats. 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-1S mono amplifier delivers 290 watts to a single 4-ohm sub, or 500 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. minimize