If you don’t have a decent subwoofer in your AV setup, chances are you’re missing a lot of the action—literally. A good subwoofer can add boom to your room, as well as music and movies.

A good sub can also be very expensive, but not if you snag today’s deal from Buy.com. For a limited time, the online retailer has the Polk PSW111 Powered Subwoofer on sale for just $149.99. This is about $120 off the list price and also includes free shipping.

This 150-watt (RMS) sub delivers a lot of power from a small cabinet. In fact, it’s so compact that you can hide it behind (or in!) furniture or place it in some other spot that doesn’t command too much room space. Even though it’s out of sight, you’ll certainly hear and even feel its presence. Other features include a crossover frequency rating of 80 Hz to 200 Hz, a phase switch, and an adjustable low pass crossover. It also has inputs for left and right line level, speaker level spring terminals, and an unfiltered LFE line level.

This is a very nice price on a very nice sub, so you’d better act soon before Buy.com jacks up the price!