sub blow thru

mrjc480 wrote: 1. Build a Bandpass box in the bed and extend four 4" ports into the cab

A friend of mine did this with a 12" and some flex-tubing to get bass into the cabin of a drop-top Miata. To be honest, looking at your ideas and thinking of your options, this has got to be the *only* thing I can think of. This sort of thing could take *alot* of trial and error. I wish I could tell ya how the results were, he plowed the Miata into a Volvo like a week after he put the box in and I never got to hear it."I'm finished!" - Daniel Plainview

 I have had alot of success doing complete blow throughs. Using a plasma cutter cut a window through the cab of the truck into the bed. Its very time consuming and it voids any warranty you might have had. its extreme customizing but thats the way to get killer bass out of a standard cab truck.. I have also seen people put caps on and take the back window out and put the enclosure there.

The truck is bagged and lays on the ground so chopping it up is not a concern.  I am just curious as to how my ideas will work.  Will  these boxes radiate bass into the bed or will it mainly stay in the cab?  Is it okay for ports to extend out of the box 4 or five inches?Im moving to MEXICO and Im not speaking spanish!

The sound will resonate throught the port and no it doesnt matter if the port sticks outside of the enclosure. The only difference in placing the port on the outside vs the inside is port area displacement (kinda like basket displacement for the woofer). The closer the bass frequency is to the tuning frequency of the port the louder the out put will be. So choose your port tuning carefully. Once the bass frequency drops below the tuning frequency of the port you will get very little output since the subs will be in the bed of the truck. The physical opening size of the port doesnt matter its the volume of the port that effects its tuning and thus the frequency response of the enclosure. the port can be round, square, dimond shape, triangle, etc..You will also want to round off the edges of the port using a router to eliminate port noise.

I wish I had pics of my old Toyota I used to have. But it was a 1993 Toyota Pickup standard cab, bagged. We cut a hole about 9" high by 36" wide in the bed and cab. We joined the two using accordian boot. I had two JL Audio 12" subs in a ported enclosure firing into the cab from the bed. We sealed the box to the bed by making a custom steel cover and spot welding and siliconing that to the bed. On the inside we made a custom amprack on the cab and was able to make the accordian boot basically invisible. It was loud as hell in the single cab PU. and looked really good. I had a place in Alabama(Jimmys Car Stereo) help me with the install.