The QSC KSub - Dual 12" 1000 Watt Active Subwoofer for K Series is best for competting.
JL Audio subwoofers have a great sound quality. They have great reviews out there so you can expect the best quality for this brand and a great value for your money
There are many places where one could purchase Orion subwoofers. The best place to purchase Orion subwoofers would be electronic stores like Best Buy or Amazon.
The JBL MRX518S 18" Bass Reflex Subwoofers are the best.
Subwoofers produce the lowest audio frequencies, resulting in that earth shattering deep bass that you get at the movies. It also improves music. The single best thing you can do to improve the sound system.
It is possible the subwoofers are causing a chirping sound, you would be best taking them to a local dealer in your area and asking for professional advice
(2) 10" subwoofers (with the limited room) will probably work the best. (2) 10" subwoofers (with the limited room) will probably work the best.
The Kicker Solo-Baric L7 S10L7 (2002) Car Subwoofer is the best. It's very affordable with a high-quality sound, and received 5 stars on www.ecoustics.com.
The Legacy subwoofer gives great output for the money, but if yo're looking for the best sound, consider the Pioneer flagship subwoofers.
One can buy a set of powered subwoofers from Best Buy, Sears, Walmart, and Fry's Electronics. A set of powered subwoofers can cost anywhere from $90 to $700.
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Depending on the desired sound quality and the size of your car, your best bet would be to stick with 10" or 12" Subwoofers as these would take up a moderate amount of space and offer lower frequency response (i.e. deeper bass) than 8" or 6.5" subwoofers. Pay close attention to the maximum RMS wattage and the size of the magnet (bigger is better).
There are many places that sell home theater subwoofers. You can purchase them new or used at a very good price. Any electronics store should carry subwoofers, and they should be priced competitively.