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Wanted something clean, simple, good sound, and inexpensive. Went with two 8" woofers down firing under the seat. Turned out great and very easy to install. Here is a list of the stereo equipment. Kicker px200.1 amp, audio control lc2i controller with bass gain remote, image dynamics ID 8" woofers dual 2 ohm, custom box by myself. Have about 320$ total in everything including the material for the sub box and all extra wiring and connectors. Tapped into the factory power wire in the rear door sill since I do not have the Sony factory amp. The line level controller I tapped into both rear door speaker wires behind the b pillars. Amp and controller is grounded to the bolt that the top of the rear seat latches to.

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Equipment I used

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Custom box I made. 32" wide. 8" front height 5.5" rear height, 13" wide. About .4 per sub. 1.5" of depth between the face of the woofers and the floor

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Tapping into rear door speaker wires

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Amps and controller mounted on rack to hide wires

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Box complete

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Bass remote perfect fit in the cubby below trailer assist

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Sorry about the sideways pics. Must be an iPhone issue.

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The audio control module is a nice little piece. It turns the rear speaker wires into rca outputs at a high voltage. Also this unit will detect the speaker inputs then has an output at 12 volts to turn on the kicker amp. The gain on the kicker amp is 1/8 turn from off. The gains on the lc2 unit are barely on. Super clean signal with no noise or turn on/off pops.

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The little amp rack to hide the wires. 16" long and 5.5" wide. 2.25 tall. 3 sides enclosed, back is open for the wires to come through