I'm looking to build a box for my four 10's. Does anyone know where i can find the proper dimensions to build my box?

 

I found mine on the tape measure...but that's me

 

The dimensions of the box will be totally dependent on the brand and model of the subs and the type of box.

 

What kind of subs are we talking about here? Some subs are made to work in different enclosures, such as reflex, sealed, or even bandpass. There are a lot of factors involved and without the Theil/Small figures on the driver itself, (and the proper equations) it would be impossible to just guess at a volume of air space figure that would work. If you bought these from a dealer, they should be able to give you the info you need. If you got them from a private sale, try the manufacturers web site, or just call them and they will be able to help you out. This information is critical to good sound, and sometimes the health of your subs.