I want to build a new sub box in shop, and I was thinking about mounting my two twelves isobaracly (gasket to gasket) in the middle of my box, and then make room for an amp on either side of them. How would this sound? Would it be as loud as my current setup? (both facing up at the hatch glass) Is there enough room width wise for a twelve and an amp on either side? I haven't even started measuring yet.

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yellow 86 Camaro
LG4 700R4
ROH RH 17x9
Bridgestone Potenza RE730 255/45ZR17 all around
Pioneer head unit
Kenwood speakers
Infinity Beta Digital 300 amp
2 Infinity Perfect 12s

Now KYB equipped!!

 

Hey,

Theres plenty of different shcemes for chambers and bandpasses. I wouldnt do the isobaric thing. I dont see a people winning sound offs with it. If the pros dont go through with why should you. I would contact the company for the best.

 

I've done it numerous times. It has always sounded great.

The biggest advantage is that you can use a box about 2/3 the volume of a single speaker. It also gives the speakers more control and stability.

Will you lose volume? Yes and no.
You won't gain the extra ~3db that a side by side set up will give you due to the increased area, but you will still gain ~3db by running them off the amp briged. So your not really "losing" volume per say, you just aren't gaining as much. It's kinda like explaining the stock market.

Just because the pro's aren't doing it, doesn't mean that you can't. After all, one of the catagories they compete in is SPL. Will you ever compete in SPL? Or are you more worried about sound quality and speaker control? And possibly box size?

Just remember to run the one on top out of phase with the other, otherwise they'll be fighting each other something fierce.

AJ

 

My understanding of an isobarac setup was that they originated from the old days, when voice coils were alot smaller and couldn't handle as much power. So they mounted two subs isobarically, creating in essense one sub with two voice coils to increase power handling and controllability. Since the two subs are mounted face to face, you only have the cone area of one sub, so an isobarac setup is not optimal for SPL, it's more for SQ. I was also under the impression that with current subs, the voice coils have developed beyond what they used to be, overcoming the previous limitations, making isobarac loading a somewhat obselete setup. This may explain why it's not commonly seen anymore. I could be mistaken on this though. But I do know if you want SPL, isobarac loading probably isn't your best option.

- Mike

 

There has really been no benifit to isobarik enclosures since the first small enclosure sub was released. Why pay for two subs to do the work of one only to attempt to gain what you can get from a single good quality sub anyway?

Theoretically you can cut your box almost in half, but when you can get a 12" sub that works in .75 cu ft, then why bother?

Bottom line, don't bother.

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Carl
CarAudio Resources
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[This message has been edited by GndPrx (edited September 01, 2001).]