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Old 25th September 2005, 02:25 PM   #11
rabbitz is offline rabbitz  Australia
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Join Date: Jul 2003
Location: Newcastle, Australia

My previous comment was about having it very close to a boundry so no or little gain is realised in the sub's range for 1 boundry. I believe you get smoother performance if all 3 boundry dimensions are different and at least one is outside the sub's range and maybe one of the reasons downfiring work well.... dunno.

Using +3dB gain at 1 boundry dimension (that is 0.05 x wavelength), then when we have driver 100mm from the boundry, the 3dB gain is at 166Hz which is outside the sub's range so doesn't effect the response. There are of course gains and losses at other frequencies but have picked a maximum point.

I had a problem with my sub location due to having to be stuffed into a corner.... 3 boundries which is not good for a smooth response IMO. So I made the sub side firing and about 80mm from a side wall. The other 2 dimensions are different so all in all worked out well.... but saying that, 2 equal boundry dimensions can be helpful to boost the same frequency. It's the third boundry that's the problem IMO.

The numbers above are from a Aus Hi Fi article in the 70's and more to do with stereo speaker placement but the fundamentals still apply and was based on L.L. Beranek, Acoustics, 1954, a book which means nothing to me.

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