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Author Topic: Port Choking  (Read 8136 times)

Antone Atmarama Bajor

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Re: Port Choking
« Reply #20 on: January 08, 2007, 10:11:59 pm »

Yes I'm interested.

    I'd like to take a look.



Mark "Bass Pig" Weiss

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Re: Shop vac hose as sound effect: Port Choking
« Reply #21 on: January 10, 2007, 04:34:27 am »

Antone Atmarama Bajor wrote on Tue, 02 January 2007 13:42

     Isn't the main problem with extended (Shelved) LF cabs, the lack of control over driver excursion.  So even though you can reproduce extra low bass you can't actually do it at very high SPL?

I have seen some ports lined with felt and other such materials.


That is true at 1 oct above the vent tuning. But since I don't use these much above 25Hz, it's moot. A 3dB roll off in amplifier power up there is all it takes to bring the excursion back under control.
My concept is to extend the Low-Q Hemholtz Resonator's (a slightly trapezoidal-shaped path) bandwidth so that it is effective over a wider range of frequencies, not just +/- 1Hz. However, the real gain should come from the massive vent area facing the room--so room coupling of the vent output should contribute the lion's share of SPL below 20Hz.
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