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resonance and sealed enclosures

I was wondering: suppose you have a smallish sealed subwoofer with a resonance frequency of 40 Hz (obviously not up the quality of the things usually talked about here). This is right at the frequency of the low E on a bass. My concern is that the reponse at 40 Hz will be exagerrated. The resonance peak on a sealed sub isn't important when it's 20 Hz or below. Will the 40 Hz resonance really matter?

I am thinking about using this sub for computer speaker BTW.
daniel_newhouse5e69

Showing 2 responses by eldartford

eldartford
4,262 posts
 
Poor old Dr Bose had a really neat idea long ago. Instead of trying to lower the resonant frequency as much as possible, push it UP, to 200 Hz or higher. The advantage is that rolloff below resonance, although very great, is smooth and predictable, and can be compensated by electronic means. (This is quite different from the practice of a modest (3-6 dB) boost at 30 Hz or so commonly used with sealed subwoofers). Downside is that a lot of amplifier power is needed.

This idea always appealed to me, as I am a "contrarian". If everyone thinks that one approach is best, I try the opposite. This served me well in a long engineering career.
eldartford
4,262 posts
 
Sean...We know how you feel about vented speakers, sealed speakers, and even TL, but what is your take on the resistive vent, such as used with great success in the old Dynaco speakers? I tried this once with a box that was a trifle too small for the driver, but didn't see much effect, good or bad.
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