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. You can adjust the low-pass
filter to tailor the signal going to your subs, while a bass boost adds
extra punch to the lows. Switch on the subsonic filter to improve your
sub's performance by removing inaudible ultra-low bass. Preamp outputs
simplify setup when it's time to add another amp to your system.