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Multi-Way Conventional loudspeakers with crossovers

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Old 10th October 2012, 10:41 PM   #41
Remlab is offline Remlab  United States
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The primary difference between speakers and rooms is that an internal dimension of let's say 7" is going to come with standing waves that relate to a 7" wavelength. A normal room does not have standing waves at a 7" wavelength. So it is way more important to break up or absorb (Or both) the standing waves in the cabinet than to look for unrealistic room based ratios. Magnets and internal bracing are actually a good thing to combat this problem. Something similar to this;
http://www.bhphotovideo.com/bnh/cont...=437626&is=REG
would be awesome, internally.
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Last edited by Remlab; 10th October 2012 at 11:02 PM.
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Old 10th October 2012, 11:38 PM   #42
tvrgeek is offline tvrgeek  United States
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I too don't care about room based ratios. I use absorbers, furniture, and bass traps. I don't have the luxury of building a room; where I do have the luxury of building speakers.

I have little belief fancy shaped diffuseness have any better performance than a piece of 1/8 ply gently bowed. But then again, I would prefer just a 4 inch thick slab of foam over 4 inch fancy convoluted cut foam. I find it works better. I stuff my sealed boxes with fiberglass and lightly stuff my ported boxes with Dacron. Seems to make take care of things well enough where other issues are more important.
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Old 11th October 2012, 12:41 PM   #43
4Torr is offline 4Torr  United States
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Spreading internal resonances can yield a lower frequency bass reflex f3.

The greater amount of damping material needed to quiet the resonance of, say, a 1:1:1 cabinet (one big peak) vs one with golden ratios (3 smaller peaks) will result in greater resistive loss and a less efficient bass reflex enclosure.

Last edited by 4Torr; 11th October 2012 at 12:50 PM.
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Old 11th October 2012, 03:15 PM   #44
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The 0.6818:1:1.618 ratio yields a 2/3 octave spread between resonances, another common acoustic ratio (come on memory) of about 0.7937:1:1,2599? splits them up by right about 1/3 octave.

As for room ratios, why wouldn't you use a proven performance ratio? The low frequency performance of a small room is definitely ratio dependent, attempts to correct afterword is not only a compromise but it is expensive.
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