have you sat in a car that does 140db and then hopped in a car that does 143db? there is quite the noticeable difference (about twice as loud). i am not going to cram this thread full of useless bickering so do me a favor and hop on over to the termpro forums and argue your point there and see how many people tell you that you are wrong......and so is the lack of research in the table that you referenced.

30 db is ten tiems as loud 20db which is 10 times as loud as 10db

1 db is the smallest detectable difference in loudness.

That said, if he were really interested in db's, he wouldn't be puttign a single small sub in the pass through. This is an aesthetically pleasing design, btu will provide little more.

A single well powered 10 in a zenclosures rear facing box is what the doctors ordered if you want noticable bump. A 4080 box is sufficient as well, also an Alpine Lat array transducer system, but honestly, you will get no more from the setup you are designing then a rear facing high end bass tube.

you are right, I am not exactly looking for lot of bass, just a little more that my speakers dont have, maybe I could have got by replacing the speakers with better ones, but I do like the aesthetic appeal of this and also it will gove me something todo during my weekends. But I really appreciate all your views and I am sure you guys have more experience in this than I do. Finally I have decided to go for the JL subwoofer and the blaupunkt amp which I think fit my budget and will satisfy my needs at the same time. (@ seifer51582 and Juice --> I thought about the arc audio and the elemental designs woofer (i am sure both are pretty good) the only reason I am not going for those is bcos they are 8" subwoofers and wud'nt fit the way I want on the storage box)

PS: I did not want to do this using my storage box, so i bought a spare storage box from one of the members last night and I will start building the enclosure once i get it :)

Well good luck with the build man, and when its done post some pictures!!

so do you not have the bose system in your car already?

the reason that i ask this is because you said that you were looking to make up for what you were missing and it is difficult for me to believe that you will be able to do that with a 6 1/2 when you have 8" speakers in the door. Just a thought none the less.

and regarding the statement that revvittupp made; the only reason that the db discussion was brought up was because we were comparing the sensitivity ratings of the ed and the arc subwoofer which is the rating of the sub with a supplied 1w/1m measure in db. this along with the xmax are two of the ratings to really pay attention to when comparing sub. i was just pointing out that the sensitivity rating of the arc was 2 db higher than the ed with less power and was therefore more effecient.

with everything being said i do wish you luck srinivasadi and let us know how it sounds and if you have anymore questions or run into any problems when you are getting everything all wired up.

I have the base system not the Bose, Thats why I am not satisfied with the bass i get with it.

Have you actually looked at those el cheapo 8's?

I knwo why it was brought up, and furthermore what sensitivity ratings are, btut hte fact of the matter, the center pass through is an aesthetic location, not a good choice for audio to begin with.

Finally I have finished the enclosure today. Used MDF to build the enclosure... best thing is I can remove the storage box whenevr I want even after the woofer installation :) ... posted pics check them out (soory for the bad quality was from my phone.)

I cut out the plastic storage box enclosure and took the dimensions of it and since I needed 0.15 cu ft for this subwoofer, I elongated the dimensions a little bit so the enclosure in almost 1.5" longer than the platic storage box now. I used 1/4" MDF for the construction , used epoxy resin to hold the box together and seal it. Also used silicone based sealent from the outside to keep it as leak proof as possible. I thnk it turned out pretty good. I need to get it installed and see how it works in the car... will update once I do it tommorow with pics.

http://img224.imageshack.us/img224/3...0265kp8.th.jpg
http://img65.imageshack.us/img65/135...0266vd3.th.jpg
http://img224.imageshack.us/img224/9...0267bv4.th.jpg

more pics....
 

finally got a chance to take pics today. Installed it last sunday, and had togo on a work trip so did not get a chance till today.

(click on the pics to enlarge)

http://img227.imageshack.us/img227/4...0271nw5.th.jpg

http://img227.imageshack.us/img227/5...0272lm6.th.jpg

http://img233.imageshack.us/img233/8...0273bh5.th.jpg

The amount of bass I get isnt much but its enough for me, you can hear the bass slightly from outside but isnt much. This was the perfect solution for the amount of bass I needed and at the same time kept my trunck space too. Since I did it myself it turned out pretty cheap too (woofer abt $125, amp $60, building material such as MDF+epoxy glue+carpet+dampening material+extra storage box = <$100, RC cables, Installation kit was about $60 and I bought most of the stuff from parts express, Amazon )

I got a lot of good advise on wat to buy for this build from this forum. Please let me know wat you guys think of this project :)

It looks super nice man! I'm super new to rx8's and want to do something relatively the same. while you were choosing where to put it, did you think about the center armrest in the back?

I did not think of that, but if I think of it now, I think it is going to rattle the whole center console with the base. It was tricky to make the ski pass thing to keep from rattling. I still get soem rattles (when it reaches the resonance, i think). But I dont listen to very loud music all the time, and it works for perfect for the regular volumes. Goodluck if ur trying the armrest thing, show us your work when you do.