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Shudson105
Member

High Freq Rolloff

I am trying to find a way to attentuate the high freq using a passive method without having to buy an expensive EQ. I just want a nice simple rolloff from 5khz and up. Perforated vinyl sounded promising since it would attentuate 5khz by 3 or 4 db and rolloff steadily from there, but I am worried about the comb filtering effects caused by the vinyl sitting 1/2inch away from the speaker. I thought perhaps my next step could be to build a passive crossover or filter that could do the same thing, however I have little knowledge in that area.

Anyone have any suggestions or sites where I can get the knowledge to continue?

Thanks,

Steven

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08-08-2009 04:32 PM

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N2Audio
Senior Member

http://bcae1.com/passxovr.htm

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08-10-2009 10:11 PM

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sicaudio
Senior Member

after you read that you can goto www.parts-express.com they sell passive x-over kits that you can solder together very easily to custom tailor the freq x.

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08-12-2009 11:11 AM

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Shudson105
Member

Thank you both for the replies. Upon reseaching the crossover design site, I believe that what I am looking for is more advanced and not a common design goal. A first-order crossover is 6db/octave. I am looking for something in the range of 2-3db/octave.

Further reseach online has led me to some kind of diffuser made out of natural wool felt. I have seen and read about a thick wool felt panel cut out around the tweeter and extending several inches towards the baffel edge to cut down refractions and therefore brightness. More advanced is a star shaped cutout which also further cuts down on refractions from the felt itself while improving off-axis responce. At least that's the claim.

To be put to the test soon!

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08-12-2009 11:26 PM