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Old 4th July 2009, 07:15 PM   #201
KSTR is offline KSTR  Germany
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Not the speakers themselves are the concern here, Joshua, rather the side-effects of RF leaking into the amp via the normally unshielded speaker wires -- especially when the amp is a typical global NFB design. Output inductors don't help much unless they are split into two parts, one per each single wire.

http://www.diyaudio.com/forums/showt...73#post1419373

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Old 4th July 2009, 07:23 PM   #202
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Thanks.
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Old 4th July 2009, 07:47 PM   #203
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Quote:
Originally posted by Joshua_G
How does RF impact speakers?
It doesn't directly, but the speakers and cables are an easy way for RF pickup to be directed back into the amplifier.
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Old 4th July 2009, 08:18 PM   #204
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It's called IIM distortion, also studied and written about by Matti Otala, (and me) about 32 years ago.
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Old 5th July 2009, 03:38 PM   #205
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You knew it all
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Old 5th July 2009, 03:47 PM   #206
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Quote:
Originally posted by PMA
You knew it all
... except that RF ingress via the speaker cables is not interface intermodulation in this context.

See

http://www.aes.org/e-lib/browse.cfm?elib=2817

and

http://www.aes.org/e-lib/browse.cfm?elib=11887


... and I guess John refers to this:

http://www.aes.org/e-lib/browse.cfm?elib=3765

The AES lists only one conference paper with John Curl as co-author here:

http://www.aes.org/e-lib/browse.cfm?elib=2229 which is not related to IIM.

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Old 5th July 2009, 04:26 PM   #207
dimitri is offline dimitri  United States
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Dig deeper, Jan
http://www.aes.org/e-lib/browse.cfm?elib=3379
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Old 5th July 2009, 05:23 PM   #208
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Quote:
Originally posted by dimitri
Dig deeper, Jan
http://www.aes.org/e-lib/browse.cfm?elib=3379
This is the same article as the 2229; one is the conference paper, the other is the JAES article.

I think there are some more articles on TIM and IIM with John as (co) author, possibly IEEE? John?


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Old 5th July 2009, 05:27 PM   #209
dimitri is offline dimitri  United States
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Omitted factors in audio circuit design
Curl, J.
Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '78.
Publication Date: Apr 1978
Volume: 3, page(s): 263- 266
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Old 5th July 2009, 05:34 PM   #210
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I have no access to IEEE papers.

Edit: What are the omitted factors? Can you quote the abstract?

(I did find out recently that I can become a member of the local university library that will give me that access. It's on my to-do list

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