I am selling a beefed up TC9 15" sub. It is the original TC9 but with an extra spider and more sturdy cone and surround. The sub sounds fantastic. I had it in a 3.8 cubic foot box after all displacement. It is dual 4 ohm currently wired to 2 ohms.
I've got it in a 4 cubic foot (net) box in the trunk. The trunk has minimal extra space as you can imagine. It can be ran sealed as well so you could have a significantly smaller box. I think the gross volume of my box is like 5.7 cubes and it fits in the trunk with a little extra space for amplifiers, running wires, and other fun audio accessories.
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