my sugesstion is audiobahn bleeeee... do it front 2-way system, soundproof mats for the door, for the back sub i preffered 12" for better low, but 10" its good for quality, depend how much u can spend on it.
PM me for more details...
thx
Michael

 

forget what size sub for a wee min and think about the stats.. a 12 sub in the wrong box wont give you any beter bass than a 10" in the rite sized box.. its all about the internal volume and the port volume. if the port is too big in the box it wont sound like it shoiuld. if the internal volume is too small for the sub it wont sound near as good either.. unles you have the box buit to spec for the sub and you dont have the port right it doesnt matter what size sub you have in in..

basically in theory, a 10" is better for short thumpy bass, and a 12" is better able to handle lower longer bass tones.
a sealed box is relativly easy to make right, find out the spec of you sub and build the box to the specified volume, no matter what shape the box is. but a ported box is alot harder to get right. you need to get the port volume, size, width and depth right in conjunction with the size of the box. and anything other than a standard round port is a nightmare to get right..

you also need a amp thats rite for the sub to get the most out of it.. and tbh you shouldnt amp your 6x9s if you running a sub, esp if its not all set up right.. they will just over power your sub and leave you with poor bass.. aswell as the fact the 6x9s will be distorting the entire air displacement in your boot, which will give you poor bass..

my advive yould be to scrapp the 6x9s, upgrade your fronts with a set of components with tweeters and get a box to suit your 12" sub.. make a sealed, box, completly air tight. and bobs your auntie.

 

I would agree mostly with hargy. The enclosure is just as important as the woofer and amp. One good 12" and good set of conponants is all you need.

Power both of these correctly and you could have a very nice compact set up.

A decent 12" woofer needs between 1.5 to 2.5 cubic feet of an area on the inside for a sealed enclosure.
I usually make mine approx 1.8 to 2.0. A ported enclosure needs to be much larger. Ported is louder but sound quality is lost.

 

QUOTE (euro-star @ Jun 27 2011, 06:31 PM) <{POST_SNAPBACK}>I would agree mostly with hargy. The enclosure is just as important as the woofer and amp. One good 12" and good set of conponants is all you need.

Power both of these correctly and you could have a very nice compact set up.

A decent 12" woofer needs between 1.5 to 2.5 cubic feet of an area on the inside for a sealed enclosure.
I usually make mine approx 1.8 to 2.0. A ported enclosure needs to be much larger. Ported is louder but sound quality is lost.

yup, your bang on there lad, ive an alpine 12" in its own ported box, takes up most the boot, but itl make your nose tingle. haha

 

2 cu ft after displacement for most under 1kw 12" subs, tuned onto 33-38hz and you will be impressed.

If theres any help here, made recently a sketch and the box with which the new owner was very happy.
http://sketchup.google.com/3dwarehouse/det...8d&result=4