2006 Mazda B4000 – extended cab audio install

As I picked my truck up in November 2013 it had 2 speakers in the front doors and only an AM/FM (no CD, no tape) headunit.

I had to fix that. I did some custom paint while I had everything apart (easy because so many of the parts were off)

First, I had to strip the truck so I could dynamat every square inch of interior. Both the sheetmetal, and the panels were done.

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Installed polk MM series speakers all around. 6.75″ components up front, and coaxial 5×7 in the rear doors

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Ran my wiring back and started designing the box.
had to fabricate over the back trim piece as the jack was removed
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on a side project while I had the doors apart I went with aftermarket mirrors, painted them, painted the handles on the outside and the insert in the inner trim panel (liftgate handle too)

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I went with a ported & tuned enclosure with a single polk dual voice 12 MM series sub. Box volume about 1.8 cubic foot, tuned to 33 hz.
Box to have a hidden chamber to store the jack, capacitor and crossovers

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used the factory rear seat fastener locations and bolt holes to secure the box in the event of a crash. The box has enough momentum at 50mph to cut my entire body in half if it were to come loose in the event of an accident.

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Installed the amp and box, and did some carpeting. Finished most of the edges too. I may do something further with the bottom opening where the sound comes out (this is downfiring obviously) but I haven’t decided yet.

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clarion headunit
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