Sunfire SDS-10 Subwoofer
Sunfire didn't build the first small subwoofer, but they did begin the trend towards small, powerful subwoofers, characterized by having drivers with long excursion and high power class D amplifiers. The SDS-10 is the 10" model in a line that also has 8" and 12" versions. It uses a front-firing driver with a 10" down-firing passive radiator. The amplifier is rated at 250 watts RMS. For $500 MSRP, I was pretty amazed at its performance. It won't crack the plaster, but it will party hard.