Hi sleepless,

I designed it with slight allowances on the sides (outside of the box vs inside the X5 compartment), so, technically, if you want to put a 10" sub in, you might be able to increase the width slightly and it should work. The only concern would be to obviously use a shallow mount sub (I had originally looked at the Alpine 1043D - 4.3" depth), but moreso than that is to make sure it will be ok in a small volume box (about 0.35cu.ft.). I designed it with the Infinity Reference 8" sub (REF850W) which sounds great in a small enclosure that size.

I believe you wanted to know about the 1" lip at the back - honestly it was there because in my X5, theres a bit of a metal lip seperating the two compartments, so this was there to stabilize the whole box. So, interpret it however you want (you can place it anywhere under there) - make sure you cross reference my measurements with your X5 (every one is going to have variations on their interior dims) to confirm that it all works...

And please post pics of your finished box!!

thanks for the interest...


dib.