It came with its own box and both sub and rad are 10" in diameter, the box only needs to be 0.5cuft in volume but the existing box was about 0.7cuft. The idea of the passive rad is to increase the response by 3dB because it acts as a port, but you can still keep a small sealed enclosure.
Initial impressions with the old box were excellent. It's almost unbelievable how loud the bass is for the size of enclosure. I'm running the sub through a Genesis sub amp. The size of the magnet on the sub is enormous and it runs fine at 2ohm load. The SQ is tight and accurate, but it can really hit low too - it's louder than my 2x12" I had previously.
The old box:
So the idea was to get a proper 0.5cuft box with the sub pointing either up or towards the boot.
The Boston manual shows a opposite sides box for the sub - rad mounting, a side by side would just end up too big (volume wise) because it only needs 0.5cuft and with the depth of the sub I'd be stuck or making a very very awkward box - just the sub side would be about 0.35cuft.
I decided to go with what Boston recommend and the sound is a lot better and tighter - better SQ but perhaps not as boomy low down. Which I like. The new box is 22mm MDF with a screw every 2", and PVCed and sealed inside. It's got proper speaker wire connections at the back for easy removal.
The sub sits on top of a 40mm x 20mm frame of wood that is braced across the whole boot above and below the spare wheel (looking from the top). Each end of this wood is braced front to back too. The amp sits on the LHS below the sub with about 30mm of air space. I can remove the sub part with just 4 screws.
The rest of the boot has a separate false floor above the bracing. This means I can remove the false floor and still get my spare wheel out.
With some VW carpet for christmas I set about making the install with my Dad:
This is the view of the rad from the back seats. The edging on the carpet isn't finished in this picture!
I'm very pleased. Plenty of space for the luggage and a fully functional spare wheel!
