sub box math, am i doing it right?

box building is not really learnable from just reading and research, you just have to build boxes through trial and error unless you have someone directly teaching you. i had to learn the hard way and im still far from perfect, i too worked as an installer at circuit city and your friends probably dont know as much as they think they do. CC installers never got that heavy into custom boxes and they didnt receive any box building training from circuit city so anything they learn would have to come from somewhere else.

NCC, Most of the installers here at the12volt have been doing this for a long time. Many of us have owned our own shops and businesses. Some of them (like me) have been in this industry likely since before you were born. We do tend to know what we're talking about. Support the12volt.com

Well I'm looking to build this guy up this week, so I suppose we'll see how much I've learned. By my math I need 5 sheets of 4 by 8 MDF. As for Circuit City our store had 1 installer that did competition audio but all the rest were just high school kids.

Just be patient and take your time. It will take several days to build something that complex.Support the12volt.com

i intend to not only measure twice and cut once, but measure 4 times before cutting. and then cut twice...

i have one final question. in this picture you see the port end and the bracing extending under the port. is this an issue? if so what needs to be changed? ZX2500.1 - SP4 18"

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4 group 31 1150CCA batteries

its hard for me to understand your picture. it looks like there are walls in places but they are see-through, like towards the top where it says 37" and on each side there are two vertical bars, what are the vertical bars? and one set of braces with the holes cut into them dont seem to connect with anything on their top side. i think i know what you are trying to ask and from the look i dont know if that would affect the sound or port tuning. it might act like an extension of the port but that is just my guess

well i have 12 sheets of 4X4 MDF that are sitting in my basement. im going to build this box over a fwe days and then tune my BL in it and see what i get. do we think i need to hold the rear of the magnet in a brace right now or just screw it to the front and be done with it? i ask because if i buy a SP4 i will need to cut and sand down the wood to make a new brace for the deeper sub.

an album to more pics of the finihsed box design. https://imgur.com/a/vJs7Z#0