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In Reply to: RE: the late Al Sekela's choke tweak and True ribbon tweeter posted by Utley1 on January 13, 2015 at 07:16:32
Thanks Utley, I can't recall which speaker he used and it's not listed under his moniker (RIP Al). I'm not sure if the 5522, 5502 is usable across the board(?).
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Al had either MG-20's or 20.1's. I use the chokes on the ribbon tweeters of the IIIa which are essentially the same as the 20.x. I also have 2201s on the mid-drivers because I am actively biamping and have no LP filters on the mids.
Al felt that the ribbon tweeter was acting as a RF antenna and, if this is the case, then the round or flat wire tweeters should behave the same way. In a "non-biamped" or standard configuration the woofer and mid-drivers have LP filters so the high frequencies are already filter out.
As far as which inductor to use, the only thing that matters is the inductance - 10 uH acts as a 1st order LP at ~64 KHz and should have little affect on the audio spectrum. A high amperage value was recommended only to minimize the DCR of the coil and a 9A (5502) or 20A (5522) is "overkill".
thanks for the valuable info; question: are they wired at the amp end or the speaker end?
I put them at the speaker end but never really gave it much thought. I suppose if you think the speaker cables are picking up RFI, then placing the coil closer to amp makes sense.
In general, the lumped-circuit model is used in analysis of audio circuits so the actual placement of the inductor makes no difference but this is an approximation and fails with long distance transmission lines and high frequencies where placement does matter - reminiscent of Newtonian physics being an approximation of quantum mechanics in the macro world. In any case, for the short distances and frequencies involved, I would say it doesn't matter. Certainly it is easier just to put the choke across the tweeter attenuator jacks.
Edits: 01/14/15
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