If you're looking for a pair of subwoofers, then Circuit City might have something of interest. Circuit City carries a nice selection of car subwoofers by MTX, Pioneer, Polk and Sony among other brands. These subwoofer speakers are made in excellent quality, and you can find a variety of models such as subwoofers with enclosures and preloaded subwoofers. These speakers are very powerful and they will dramatically improve the sound quality in your car. So if you're looking for car electronics, then Circuit City is certainly worth a visit. At Circuit City you can find car audio products, GPS navigation, satellite radio, laser detectors and remote starters to mention a few different products. Circuit City carries well known brands that make quality products, and their prices are reasonable.
MTX JackHammer 12" Subwoofer
"12” subwoofer: The 12” JackHammer JH45 features high power handling, a precision-stamped basket for greater structural integrity, and stitched cone for added durability and style. Thermal power handling: The voice coils are wound with 428° F high temperature aluminum wire, for an extremely reliable subwoofer. Spider Plateau venting: This technology ensures a cooler, more durable subwoofer. Peak power: 500W. Frequency response: 34 - 150 Hz. Impedance: 4 Ω"
Pioneer Shallow Series Preloaded 12" Subwoofer Enclosure
"In order to create a subwoofer that is three and a quarter inches deep, Pioneer had to develop revolutionary subwoofer technology. A traditional subwoofer uses the spider design to keep the voice coil of the speaker aligned while it moves. This type of set-up can become soft over time degrading the subwoofer’s performance. Pioneer created a patent-pending air suspension system that locks air between a main cone and a drive cone."
Polk Dual db124 12" Subwoofers with Enclosure
"¾ inch MDF: The 3/4-inch MDF is the same low resonance material used in the world's finest speaker enclosures. ABS Trim: The front baffle is clad in automotive grade ABS trim for rigidity and resistance to impact. A sheet of Elastomeric damping material isolates the ABS trim from the baffle as it acts as a sealing gasket for the woofers. This "trilaminate" sandwich construction prevents unwanted rattles and resonance, ensuring bass that's as tight as it is powerful. "
Sony Dual 12" Subwoofers in Ported Enclosure
"Dual 12" subs: No bite to your system's bark? A pair of 12" subwoofers in a ported enclosure will give a substantial boost to your bass. 2000 watts peak power: These subs can withstand almost any load, meaning you won't lose sound quality as you increase the volume. They'll also be more stable over long periods of continued use. Frequency response: This subwoofer can play low tones down to the lowest possible range that the human ear can detect. Gold-plated connections"
These subwoofers can be found at circuitcity.com