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Join Date: Jun 2006
Location: Here Nor There..
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In the acoustics books I'm reading, they talk about being able to expand the Q slightly by using some material over the opening or in the neck of port to broaden the bandwidth. I guess the story is that the Roman Amphitheaters used large clay pots with ash in them to tune to specific frequencies, and then wool in the necks of the clay pots/jars to broaden the bandwidth.
I don't recall where I read that, but I'll see if I can find the reference and post a link in this thread.
That is correct you can Get A little wider Bandwidth but compared to Broad band Bass traps The Q is still very narrow thus the need for A few HelmHoltz perferably placed in the High pressure zones...