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Old 9th July 2010, 11:50 PM   #11
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Originally Posted by matevana View Post
The driver would be clamped by its magnet using a sorbothane insulator.
Durometer and thickness? I'm curious what resonance frequency you chose as a cutoff.
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Old 10th July 2010, 12:32 AM   #12
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Old 10th July 2010, 12:44 PM   #13
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Quote:
Originally Posted by twest820 View Post
Durometer and thickness? I'm curious what resonance frequency you chose as a cutoff.

The drivers have an Fs of 33Hz and are crossed using F-mods at 200Hz, 12dB/octave. They have a thick, coated paper cone designed for the elements, which results in a fairly high MMS of about 155 grams. Using a length of heater hose placed to my ear, I placed the other end at various points and am pretty confident the resonances are coming from the baffle as opposed to the driver itself.

The baffle is made of three layers, the outer being 1.2" hardwood, the center 1/4" compressed foamboard, and the inner is another layer of 1.2" hardwood. While the wood is fairly dense and fine grained, the overall baffle dimensions are small so the resulting weight isn't all that much, maybe only 20-25 lbs.

My thought was to physically decouple the driver from the baffle, with the exception of a rubber insulation channel used to reduce leakage at the "seal". The driver would be clamped at its greatest mass, it's magnet, and attached with rubber mounts to a hefty base, independent from the baffle.

Ed
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