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Post by cheglie on Apr 28, 2014 17:58:00 GMT -5
"Flexible quadruple bass management, with 12dB or 24 dB per octave crossover filters."
Could someone explain the difference? I have never tried changeing mine on the UMC-200, but still curious?
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Post by knucklehead on Apr 28, 2014 18:19:47 GMT -5
Its the slope of the crossover - 24db per octave vs 12db per octave. Using 24db per octave kills the signal faster than 12db per octave at the crossover point.
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Post by Gary Cook on Apr 28, 2014 18:25:42 GMT -5
Cross over is not affixed point, it's a slope, 24 db is a steeper slope than 12 db. The idea is to match the drop off (slope) of the sub woofer with the take up (slope) of the other speakers. Avoiding a hump or a slump at the cross over point. 12 db is the most common choice
Cheers Gary |
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KeithL
Administrator 
Posts: 9,945
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Post by KeithL on Apr 29, 2014 10:47:48 GMT -5
Precisely.... and, in a perfect world, as long as they match it shouldn't matter which you pick. In the real world, each has (slight) benefits and drawbacks... A sharper slope means less overlap. Since most cancellations and interactions happen in the area where the overlap occurs, minimizing this area should lessen the likelihood or severity of those problems. However, many people find that having a more gradual slope, with more overlap, sounds smoother (you don't have as sharp a "handoff" from one driver to the other). Another thing in favor of gradual roll offs is that gradual filters themselves tend to cause less "sonic issues" than sharper filters. But another factor in favor of a sharp cutoff for the sub is that you can localize the sub (you can hear where it really is) for frequencies starting at about 100 Hz - which suggests that a low-cut filter with a sharp cutoff (which will let less higher frequencies through) will minimize THAT problem. (Together, these are why some people prefer a 12 dB low cut filter for their mains, and a sharper 24 dB high cut for the sub - even though the two aren't symmetrical, and so don't produce a perfectly flat response, each has specific benefits which might outweigh that. Personally, I usually start with 24 dB/octave for both, then try shallower settings ONLY if I notice an obvious "discontinuity" in the sound between the sub and the mains. Cross over is not affixed point, it's a slope, 24 db is a steeper slope than 12 db. The idea is to match the drop off (slope) of the sub woofer with the take up (slope) of the other speakers. Avoiding a hump or a slump at the cross over point. 12 db is the most common choice
Cheers Gary |
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