Bullitt and Sam Both have good answers but lets put things in perspecitive. Look at how much you want to spend. Under $250, 250-500, or $500+ for the sub without box, amp, crossover, wire, etc. Installing a 12" sub in a car will cost about $1,000 if the cost of just the sub is about $250 if you include everything. A $1,000 sub will need about $3,000 to do it justice. I rate Rock Fosgate as a decent under $250 sub with JBL and MTX rounding out the group. Next level we're talking Boston Pro, A/D/S, Soundstream Reference, and the next level again Focal, Autobahn, etc. I have a Boston and I am very happy. Its powered by 300w continuous and crossed over at 200hz in a sealed box. It will blow out my ears at full so I have to stand outside the car and use the remote to turn it up higher. It also warps the rear deck of the convertable when the top is down with each thump.
Hope this helps
P.S. Here is the one I want to check out next...
The Audiobahn AWT 12
250oz Double Stacked Strontium Magnets | Power Handling: 2000 watts R.M.S. | Frequency Response: 20Hz – 500Hz | Efficiency: 87.3dB | Bolt Tight Motor Structure | PHAT 2 Inch Foam Surround | Titanium/Aluminum Cone | 4 Inch 4-Layer AVS Voice Coil | Dual 2 Ohm Voice Coils | 1 Ohm or 4 Ohm Operation | Mounting Dimensions: Depth; 6 3/4 Inch Diameter; 12 3/4 Inch
You can get there through this site. It costs $699 plus amp plus..... http://www.audiobahninc.com/index2.htm
[Modified by 92TripleBlack, 4:11 PM 8/10/2001]
[Modified by 92TripleBlack, 4:18 PM 8/10/2001]