BEL

I have a pair of 12" subs mounted in a twin box. However, the box is quite big, it doesn't fit tidily and it takes up quite a lot of boot space.

I've been thinking about taking the subs out and trying to make 2 separate smaller custom boxes with some MDF which could fit at the corners of the boot behind where rear lights are. (Like a kind of stealth installation).

I'm no expert in this sort of thing so if anyone has a similar, or even an alternative instal can they please post some pics to give me some ideas. Ideally if anyone has a box template or dimensions/ sizes, I'd really appreciate it.

Cheers
Ian

chiark

Not exactly what you asked for, but a thought.

If you wanted to gain space, you could use the 2 12s in an isobaric configuration. This is where you effectively bolt the two speakers together, face to face (with MDF inbetween!) and wire them out of phase.

Advantage: less space requied as the box volume compared to what you need for 2 subs is now quartered!
Disadvantage: you lose 3dB of output. MUST be fed identical signal, ideally off the same channel of amplification

Just a thought...

BEL

Thanks for the quick response Chiark. I'm not sure what you mean here though. Do you mean just bolt two subs together face on and then buid a ported box round them ? ..a pic would be useful if you have any.

Cheers
Ian

chiark

Have a quick look on the net for isobaric and you'll get loads. Build a sub box as normal, then just bolt another sub on the front of the one you fix in the box. You see the back of that sub then

Paul_M

Basically gives you the same performance as a single sub but in half the space (hence quarter the space of two subs in an equivalent non-isobaric config). Reason is that you get twice the suspension of a single sub but you only get the volume of a single sub and it requires twice the power (same power as a single sub but to both subs).

Hope that makes a bit of sense!

kryten

Hmmmm, takes me back to a pair of JBL 15s mounted isobaric driven off a Kenwood 1021.

F***ing loud!

BEL

OK, I think I am correct in saying (if I've got this right, doh) you don't need as big a box as you would do with only a single sub because the power generated by the bolted on sub, (operating on the reverse polarity from the other) helps to drive the fitted sub into creating a better sound. In space saving terms it sounds very useful, might be the way to go for me..One box is a bit easier to build than two after all

After having another look in the boot, I think the passenger side rear corner looks the best location to put a sub box. so I think I'll have a go to see if I can make one up to fit in there.

..again, any pics /templates to give me ideas for the box shape or mounting of the box would be very useful.

Cheers
Ian