Blowthrough Help

[thegr8cody]

so im doing a blowthrough in my 93 silverado i just got and i dont know how to design it cause its only for one 18 i've seen them for multiple subs.and they are facing each other with the port at the back.and normally like a 15x15 hole. but 18" plus the port would have to be at least like 28" wide just guestimating that.but i dont wanna do that big of a hole i probably will anyways but i just dont know how and how do i seal the box to the bed im stuck on that to,i dont wanna cut that much i wanna make it as small as i can with the best results.i remember a guy on here put a btl 18 in the bed of a ext cab silverado but i cant find that again all ican is the one with the 2 btl 15's

[AI James]

imo a blowthriugh isx a waste for 1 sub.

if you are afraid if the size of cut , then dont do it at all

[thegr8cody]

its not the size of the cut really i just dont wanna have to cut it all the way up and all the way across like the size of the box and im gonna eventually do 2

[Namosh]

The way I did mine was a box firing into a chamber that is ported into the cab.

[thegr8cody]

yea but that sounds like a bandpass and i dont want that lol

[Toxiccasper]

Then just have the sub and port fire through the big hole

[thegr8cody]

thats what i wanna do but what im saying is say my box is 17" high and 28" wide and its firing into a 15"x15" hole wont i lose output

[Namosh]

Unless you litterally mount the sub on the wall of the cab with the box built into the bed, I don't see any way that ISN'T basically a bandpass box.