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Old 28th August 2012, 11:38 PM   #1
OllBoll is offline OllBoll  Sweden
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Question Multiple dipole subs, can nulls be compensated and room response averaged out?

I have a normal sized room of ~ 5 x 5 m and want to have some bass. I want roughly equal response everywhere in the room. If I've understood correctly a good way of getting this is by using 3 monopole subs placed pseudo-randomly a la Geddes.

Would it be possible though to use the same principle but 3 dipole subs instead?

My main question is if it's possible to do away with uneven room response due to the dipole nulls by using multiple subs or if I'm fighting an uphill struggle and I'm better off with vanilla sealed monopoles?

Thanks in advance,
Olle

Last edited by OllBoll; 28th August 2012 at 11:39 PM. Reason: Icon
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Old 3rd September 2012, 05:16 PM   #2
Rudolf is offline Rudolf  Germany
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Keep in mind that those "Geddes" monopole subs are distributed over the room and probably have different phase values. Because of that those three monopoles will already act as dipole sources for some frequencies and some room directions. This is part of their working principle imho.

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Old 3rd September 2012, 06:03 PM   #3
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Linkwitz claims that dipole woofers are better because they stimulate fewer room modes. Roger Russel (retired head of acoustic research at McIntosh) claims that vertical line arrays works better with the room acoustics, to give a relatively even bass response anywhere in the room. Although I haven't tried it, I'm thinking the line array makes better sense to me, because they fill the room from more physical locations on all three axis (if you have two of them, and they go pretty close to floor to ceiling). Plus, closed box line arrays can be actively equalized to be flat to 20 HZ, where as if you have open baffle dipoles, the amount of cone displacement required below about 40HZ gets pretty extreme, and may not really be practical. Personally I think going all the way to at least 25 HZ is definitely worth it. Drums sound much better, and many movies have special effects that go way down in freq. My next woofer project will be vertical. line arrays with maybe 4 or 5 inch drivers, perhaps the Dayton drivers.
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Old 3rd September 2012, 07:00 PM   #4
OllBoll is offline OllBoll  Sweden
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Nice, then I'll make sure to test it. I have 3x AE IB15 on order which should give me enough bass even if I turn them Into 3 small N-frame dipoles.
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