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In Reply to: Re: Can the so called "horn sound" be fixed by digital equalization? posted by Frank Waelti on February 13, 2007 at 01:02:41:
If I remember correctly, EAW was looking at using digital correction on some of their high-end PA stuff to actually try to address this. This isn't standard IIR "digital EQ", but rather sophisticated time-domain FIR filtering based on numerical simulations of the wavefronts in their horns. In a nutshell, I think it amounts to impulse response correction via emission of compensating signals to 'null out' the component reflected from the mouth. It would eat into your headroom, but might actually work. Highly non-trivial, though, and it doesn't generalize particularly well - each system is a one-off.Earls solution is certainly more practical. I have some of the reticulated foam (30ppi stuff from foambymail) that I"m planning on using for plugs for my U15's. I'm very curious as to the impact.
Follow Ups:
Hi,When you try the open-cell foam, are you planning on changing the crossover to bring the sensitivity level of the hi/mid horn back up to the 97 dB of the woofer? Have you found the level-matching components?
In earlier posts, other people that have tried the foam route have found a loss in level of about 10 dB (IIRC).
I am asking because I am also interested in trying the U15's for home and live sound.
Also, have you added any lining to the inside of the U15 cabinet for first reflections off the back of cabinet through the woofer? I understand from the Live Audio Board that the cabinet as delivered from the factory may be unlined or unstuffed.
My 'ultimate' hope with the U15's is to go completely active with dsp xovers, although I'm not entirely sure how long it may take me to get there. However, yes - I'm fully expecting to have to EQ the horn back to flat after adding the foam. It's not just a matter of adjusting the sensitivity, since the impact will also be frequency-dependent. If the impact is truly 10dB it may be a problem with my current amps, but I'm planning on building some Hypex UcD's, so maybe that'll just accelerate the process.I have temporarily simply added some Acousta-stuff to the woofer cabinet. It does indeed come 'empty' from the factory. I'm planning to try plugging the ports for a sealed alignment, but this will obviously require some significant eq and boost to work.
I'm very happy with the U15's as home speakers - they are at least as good as I was hoping for, and for the price of the rat-fur versions, they're an amazing bargain IMHO.
Thanks! I can't wait to hear your results with the foam! I had an evil tickle in my mind to do the same thing. As for the 10 dB, that is just what I remember someone having quoted on this board ( I may be out to lunch on this one ).Also, I suspect that the high/mid is padded almost 10 dB to match the woofer at the moment, although there may be some kind of gain compensation network for the falling high frequency response from the compression driver, which would use up that additional 10 dB at high frequencies.
Let us know how it works out.
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