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| Date: |
August 21, 2004 at 01:37:44 |
| From: |
moro, [pcp473147pcs.westk01.tn.comcast.net] |
| Subject: |
Re: Multiple tunings? |
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I am no expert. I think though once the highest tuned port unloaded, say the 50hz one in your example the air in the box would loose a great deal of its "springiness" and the lower tuned ports would not resonate properly. I wouldn't say not at all, but with air simply rushing in and out of the 50hz port you would no longer have a normal helmholtz resonater situation.
Also the many different ports would contribute to the frequency of the highest tuned port and collectively have a different frequency.
I think the effect you are affter is like a duel chamber ported box. oft refered to by several names. It is basicly a plain ported box, that is also ported to a second ported chamber about half the size of the first. I am not taling about a bandpass or 4rth order enclosure. The speaker is mounted like a regular ported box, just the box is also ported to a second ported chamber.
Duel chamber ported boxes have 2 tuned frequencies and can exert extra control of cone motion at a wider band of frequencies. Of course there are tradeoffs.
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