Seriously small amp
Sony knows that many vehicles just don’t have space for a big amplifier, so they’ve created the XMS400D 4-channel amp.
You can’t bridge this amp, but you can use the onboard switchable high- and low-pass filters to run small subs with the rear channels and full-range speakers with the front channels. The amp will accept preamp or speaker-level signals, so it’ll hook up to just about any system.
Looking for bass
Got a Sony receiver with Mega Bass but no subs yet? This amp connects easily to your system, and the extra power will make your speakers sing. If you’ve got aftermarket speakers in your car, turn on Mega Bass and you’ll hear a night-and-day difference in the bass.