Making a box

I just got a new car and want to make a box that will be compact into my trunk so it would save a lot of room. How much cubic feet off space do i need in the box so the sub will be loud? What materials should i use to make the box? Anything i need to know before making a box? Can someone teach me the best way to make a good box.

there should be instructions with your subs that have what size your box should be. Make it out of 3/4" medium density fiberboard (MDF)

The shape of the box doesn't matter? How could i make it so the bass would be killer?

the shape of the box doesn't matter aslong as the internal volume is within the range that's recommended in the instructions. If you want killer bass, build a ported box and have a shop tune the ports.

ahem the shape does not have a huge role just remember not to make it perfectly cubical. This may cause standing waves crushing your performance. As for having a shop "tune a port for you" well it is the size and shape of the port that determines the frequency at which it is tuned. You can either read up on the exact formula's to do this and experiment always keep in mind a sub does have a range it will play. Another easy way to find out what size to make your box scavenge the net for a box building program. Input the vmas and some other parameters and it will tell you of what size to make the enclosure/port.

build it with fiberglass and mdf-you'll save the most space and also you can be sure that it won't be a cube(and kill your sound waves)

New to the forum and this is kinda late but thought I'd put my 2 cents in anyways. If you're still planning to build a box then in my opinion the easiest is a sealed box using the golden volume for your dimensions. Ported and higher order bandpass can really make some good sound but the numbers have to be pretty "on" or you can easily take range out of your speaker. Sub manuals come with all kinds of useful information and often have very complete diagrams for recommended enclosures. Someone mentioned the many calculators out on the net so don't forget those.

In the past I had to build a box for a sub that I had no specs for and as a beginner I wanted the easiest method possible. There's a lot of great general info out there and this is what I learned.

1) With no specific dimension knowledge, the golden volume is safest for eliminating wave interference (.618 : 1 : 1.618). 2) Bigger is better, but be practical. Maybe look where it will go and measure to determine one of your "limiting" dimensions and use the ratio for the rest. 3) 3/4" MDF. 4) Use copious amounts of glue and good wood screws to help prevent rattling (clamps might be handy). 5) Silicone sealant on all joints and around terminal connector (caulking gun) 6) Experiment with batting and fiber fill material (you have to have some)

I've found great carpeting in all kinds of flavors and most attach to mdf with contact cement. Remember a sealed enclosure will give the best range of the speaker and is easiest to make but might not have that "hit" your looking for. There's a lot more I'm forgetting and sorry for repeating some of the great info already posted.
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