CPS Extended Service Plan (more info)
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I had one of these in a sealed box pushed by a rockford punch 550/2 bridged in a 99 camaro. First of all, it takes a lot more power to get volume out of a sealed box, but you get way better accuracy and quality. That being said, people still would guess that I had 2 12's in the back. This sub lasted me a couple years of abusing the crap out of it. I listen to mostly metal so a lot of very quick double bass pedal hits and this baby would keep up. This is not a comp sub, but if you want bang on a budget you need to get you one or two.
Bluetooth Enabled Single-DIN In-Dash CD/MP3 Receiver with Front AUX and USB Inputs
10" 300W Xplod Series Car Subwoofer
12 Gauge 50 ft. Spool of High Quality Speaker Zip Wire
6-1/2" 150W 2-Way Formula Series Full Range Coaxial Car Speakers (FKB-116)