GenVibe - Community for Pontiac Vibe Enthusiasts

Has anybody tried to stuff an 8 into the stock 6.5 sub enclosure that comes with the m&t package?

Welcome to GenVibe!!I don't know of anyone who has, but since I have replaced the speakers, I don't think it would be possible, that is, if you are speaking of the door speakers. The fit is really tight with the 6.5" speakers, I don't think you would have enough wiggle room to do it. Even if you would cut out additional space for it, you would run the risk of interfering with the operation of the windows because the depth is VERY limited. Now if you are talking about the rear monsoon speaker (05's only but I think they are already an 8" speaker) I know there was someone, I don't remember who, fit an Isoberic Sub in that area, but I think they actually put it underneath the panel in the rear. But to answer your question, it's very doubtful you would be able to do it. Just get some nice 6.5" speakers and you won't have to worry about a sub. May I suggest the Infinity Reference series, you don't really need a sub if you mount them correctly and have an aftermarket HU that allows you to tweak the sound a little more than the stock HU.

Thanks for the info. I was actually talking about the monsoon sub. I haven't measured the sub, so I don't know if it is an 8. What is an isoberic sub? I would really like to keep the sub hidden. Do you have any suggestions as to where to keep the sub hidden?

An isoberic sub is just a line put out by Kicker I believe. It is a square sub. I believe the enclosure was custom built out of fiberglass and not really a cheap way out. But if you have the $$ anything is possible right!

I did try to search for pictures of an isobaric enclosure and what I saw was that it used two subs and produced the output of one. I am running out of ideas for placement of subs because I refuse to give up my cargo space.I have seen those small triangle-like boxes. I wonder if they would fit under the seats. I hope that my installer will have some ideas. I am afraid that he's going to have to pull the panels to see how much room is back there on the sides.

Keep watching the forums for a subwoofer project/molding tutorial...I am getting ready to stuff 4 12" woofers in the body cavity to allow for almost 85% of the cabin to be clear so I have to mold the entire thing into the car. I will post progress from the first step until the last step. This car offers some really cool subwoofer options.FYI...an Isobaric (means "single pressure")enclosure can be useful because you can make the box relatively small...e.g. you have one subwoofer that requires 1 cu. ft. net volumetric displacement for an enclosure to achieve the desired sound curve...in an isobaric enclosure TWO of those subs would go into a box that is 0.5 cu. ft. net volumetric displacement. The Isobaric alignment drops the VAS of the woofers in half (among other things) so your effective requirement for resonating chamber is halved using an isobaric alignment. Isobaric can also be cool because the "rear" woofer helps to control the "front" woofer and vice-versa.One down side, the efficiency is lowered by 3dB theoretically, so a woofer with an spl 1W/1M of 90 dB would now be an 87dB woofer 1W/1M in the isobaric alignment.

Kickers square subs are "Solobaric's". I know as I had 2 Solobaric 10" L5 subs in a custom box in my wife's Dodge Ram.

Thanks for the heads up.

Quote, originally posted by damronjr »Kickers square subs are "Solobaric's". I know as I had 2 Solobaric 10" L5 subs in a custom box in my wife's Dodge Ram.OOPS, I got a little confused.

[QUOTE=FYI...an Isobaric (means "single pressure")enclosure can be useful because you can make the box relatively small...e.g. you have one subwoofer that requires 1 cu. ft. net volumetric displacement for an enclosure to achieve the desired sound curve...in an isobaric enclosure TWO of those subs would go into a box that is 0.5 cu. ft. net volumetric displacement. The Isobaric alignment drops the VAS of the woofers in half (among other things) so your effective requirement for resonating chamber is halved using an isobaric alignment. Isobaric can also be cool because the "rear" woofer helps to control the "front" woofer and vice-versa.One down side, the efficiency is lowered by 3dB theoretically, so a woofer with an spl 1W/1M of 90 dB would now be an 87dB woofer 1W/1M in the isobaric alignment.[/QUOTE]yeah, exactly...I used to design home Sub-woofers. About 14 years ago I made myself a wicked Dual VC 12" Isobarik sub in a Push/Pull design. Sealed box but I tuned dual vents. 3 cu ft box... Nice 'n smooth down to well below 20hz... and it's still rockin the house!DaveP.S. Sorry about going off topic a bit.

Quote, originally posted by DavidPIL »Sealed box but I tuned dual vents. 3 cu ft box... Nice 'n smooth down to well below 20hz... and it's still rockin the house!Help me understand how you tuned dual vents in a sealed box...I thought a sealed box had no vents...cornfused

hey,sorry for the confusion on that. The Isobarik design is meant for a sealed box. The original design was a sealed box, I then later added the ports to the box. The porting caused an unsmooth hump in the frequency response, I don't remember all the particulars on the curve though. I cap the ports when I want a smoother response (most of the time) but open em up for movies. Not that noticable of a boost though cuz the tuning put the rise in the 30-32hz range.

No problem...Isobaric FYI is GREAT in ported applications...one of my favorite subs I have ever built was 2) 15" woofers, clammed, in a quasi-dual reflex bandpass (or "compound BP" where the rear port vents to the front chamber)...it was REALLY loud and REALLY accurate with all program material, the mark of a good sub IMHO