Ok, so i was doing research and wanted to share my subwoofer box idea with you.

I know this is way beyond standard, and I kinda want to experiment anyways so im going to give this a try.

The basic box is an Isobaric design and the total sealed box volume (not including the front sub chamber because its effectively useless) is approx 2.664 cubic feet. So if this works as planned it will be one responsive box. AND it fits just about perfectly in the two little pockets on each side of the trunk taking up very little usable space. (Yes the jack is being relocated)

So give me your thoughts, positive or negative. I think outside the box so i expect a bit of both. Especially you audio veterans, im going for sound quality versus SPL numbers. I have a 700 Watt amp driving the 12" subs so hopefully it has enough kick to make them pressurize that box.I have plenty of years of woodworking to do this, its just the audio theory im newer at.

And here'* my preliminary designs:


Isometric (3D Angled) View


View from the top rear. the opening to the trunk is 2 inches wider than the space between the two boxes, so no real usable space is wasted..

I am very interested in seeing what that box looks like when it is done! Please keep me posted on your progress. Now with that amount of air space, what type of subs are you running?

i have never seen anything like this... whats the idea behind the sub area... why are they back to back? seems useless to me, unless i dont know somethig

Advantages of this design are increased linearity in the speaker movement, lower space requirements, and increased power handling.

Disadvantages are increased cost, increased design and assembly complexity, and decreased efficiency.

but couldnt this be accieved with a passive radiator instead, and reduce cost and complexity greatly?

I have kicked that Idea around in my head and with a few installers I know.... Interesting to say the least.. im not to sure on how it'* going to work but even if it doesn't you can always redo them to make 2 separate boxes...

Not really. Due to improved subwoffer design equal results could be gained with just using a sealed box. The design would be different if you were using a passive radiator. In an isobaric you want both of them to have power because that is what gives you the ability to make the box 1/2 the size (twice the motor strength) and help keeps its linearity. A passive radiator wouldn't help you with either of those.

more good info at the bottom of this page
http://www.mtx.com/caraudio/educatio...sureDesign.cfm

Brian:

Ill take detailed pictures, ill proly start building this week (im off on spring break) and keep yall updated. Two inexpensive (especially for me since i already have them) Pioneer TS-W300R'*. I had one in a leaky birch plywood 1.5-2 cu.ft. box before and it really sounded amazing, but took up more'n half my trunk. So i thought i wold experiment since i had two of them already anyways and needed more trunk space.

Toasty:

[Edit out now that it has been answered]
What corvette said.

AGXP:

Exactly my thought. If it doesnt work, it isnt that hard to fix it so it does.

I would not build that design. Running isobaric with those subs in 2.66cu.ft. is too big. With the dimensions of that box, you'd be better off running one sub sealed in each side, sharing about 3 cu.ft. This would be a more efficient use of power for the space used IMO.

If you do build an isobaric box like that, I would consider making it ported. My $.02

According to WinISP (or whatever that subwoofer design software is) i calculated that that would give me more VOLUME but less accuracy. It would distort about a 50Hz section in the middle of the band to be too loud. Where as the Isobaric makes a more accurate curve and reproduces bass 10-15Hz lower than a standard 2 driver system putting my -3db point at closer to 25 Hz than 40Hz.

Why is the box too big for an isobaric design is it a factor of the drivers im using?

Are you going for SPL or quality most of your recommendations seemed like they were based on volume?

Sorry for all the questions Im just trying to learn and I am going at this with an open mind.

Thanks!