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Re: how did u get that aperiodic membrane made? (m (archive)

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Posted by Lincoln on April 25, 2000 at 11:54:21:

In Reply to: how did u get that aperiodic membrane made? (m) posted by Josh///M3 on April 25, 2000 at 10:46:26:

The membrane itself is actually a purchased item. It's alot like the rigid insulation used on AC return plenums. I don't think your average shop probably has much experience with building a membrane system (easiest way to tell is if they bad mouth it or not). It's relatively expensive since the installer needs to work to some cabinet maker-like toleranced in the area where the mambrane is located. It's also very important to match the correct thickness of membrane with a certain Qts range of the speaker (this is the scientific part and I don't have the info anymore). It really works great, but you could essentially achieve 85-90% of the results by using a really good stiff free-air woofer and building a false rear deck like in my car (cost would be hundreds less, also).

So my advice is: If you can find someone who knows how to do it and you have the $$$, then by all means...do it. Otherwise, try the free-air option. Both of these methods will work better then the old "box in the trunk" method (sounds slow and damped, and takes up all your trunk space). Stealthboxes sound good, but the 8" just isn't enough in this car.


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