This is a pair of subwoofers system package that I put together using Asylum Car Audio 12" subwoofers,  a prefabricated ported enclosure, a CFAB1500.1 rated for 1500 watt RMS in this application, and a 4awg #FAM Wiring kit with all the fixings. 

Here is a quick breakdown of each component:

$499.98 Pair of Asylum Car Audio 12" Subwoofer: 600watt RMS dual 4 ohm voice coil 
$149.99 Prefab 12" ported enclosure
$299.99 Asylum Car Audio CFAB1500.1 1500 watt RMS @ 1 ohm amplifier with bass knob
$99.99 4awg #FAM copper wiring kit with RCA cable and speaker wire

$1050 total package value