i'm selling an alpine type-r 10 and a custom box made to spec, and the port is also tuned. this thing bumps for 1 10. price is $200.

Details:

» 10" 4-ohm subwoofer with dual 4-ohm voice coils
» Kevlar-reinforced pulp cone with Santoprene rubber surround
» cast aluminum frame with perimeter venting
» frequency response: 26-600 Hz
» power handling: 200-500 watts RMS
» peak power: 1,500 watts
» sensitivity: 83 dB
» top-mount depth: 6-7/8"
» sealed box volume: 0.5-0.8
» ported box volume: 0.6-1.3