Of course, we considered speaker cables as an RF antenna 40 years ago. Look at Otala's IIM distortion papers. I think you will find something there, but in any case we discussed it among ourselves.
I still use to shield my speakers cables and boxes ;-)
The output coil in the amps helps on this, but the output impedance of the amps are not so low as expected at RF, and the feedback loop is an input for RF signals.
Do we all have a sudden vehemence for an RC Zobel to ground at the amp's output? There's your low impedance termination.
I've met the Siltech guys in the previous millennium, can't recall any talk about rf/tl. Their hottest ticket now does something like $8.5k per stereo feet.
(not much use to me anyway, I still do cross-connected hd coax as speaker cable, and am confined to a solitary straitjacket room by the local government)
Jacco,
Are you talking about some kind of solid core coaxial cable or what here?
Is the jailer for the straight jacket your Wife!
Are you talking about some kind of solid core coaxial cable or what here?
Is the jailer for the straight jacket your Wife!
Mr. Soibelman, surely you are not accusing me of taking any other form of 'authority' serious.
2 coaxials, inner conductor of one connected to the shield of the other.
http://www.diyaudio.com/forums/soli...l-shielded-cable-input-wiring.html#post782635
2 coaxials, inner conductor of one connected to the shield of the other.
http://www.diyaudio.com/forums/soli...l-shielded-cable-input-wiring.html#post782635
Eidetic images can be weird indeed. Last 'big' one I had (20 years ago) was of a poster stating with the most vivid of letters & background stating that the woman sitting next to me would bring trouble!
............She did - and plenty of it!
Perhaps best in the telepathy thread!
............She did - and plenty of it!
Perhaps best in the telepathy thread!
If only it didn't make one talk so weird.
( http://www.diyaudio.com/forums/pass-labs/186060-threshold-sa-4e-vs-sa-1-a.html#post2548248 )
Bruce Hofer of Audio Precision has a new presentation on 'Designing for Ultra-Low THD in Analog Circuits' this really useful as well as telling many of you as Ed Simon and have: "I told you so!" Get it if you can. It is in pdf format, about 1.6 meg.
Bruce is my buddy, watch out. He doesn't do quantum purification. He is hard core engineering all the way the BS walks.
That one was 6.12MB
http://www.ap.com/download/file/747
>Edit. The link at AP site although dated 25 Feb2014, leads to the same Audio Express Nov 2013 pdf
George
http://www.ap.com/download/file/747
>Edit. The link at AP site although dated 25 Feb2014, leads to the same Audio Express Nov 2013 pdf
George
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It has been known for years that speaker cables can act as an antenna. Radio amateurs have been only too aware of this, as their neighbour complains that he hears a funny noise on his 'hi-fi' some evenings! May be less well known among audio folk, but then there is the danger of over-hyping things.Triodethom said:
Maybe some misunderstanding here?hitsware said:
The presentation I was sent appears to be a 'Power-Point' that has a lot less detail, except for some fundamental recommendations not present in the 2013 article in AudioXpress. For example, avoiding 'bulk metal resistors' for hi end audio, etc.
I don't know about "avoiding" bulk metal resistors - I believe the commentary is just that they aren't as much better on thermal modulation distortion at audio frequencies as simple comparison of DC Tempco might lead you think
still very good compared to many other types
Bruce's recommendation for ultimate low distortion numbers (way below any suspicion of audibility) are still expensive and uncommon 5 ppm thin film R to see better distortion numbers than the bulk foil at audio
(and some of us "conventional engineers" have seen the presentation in person at AP Audio Master Class seminars)
still very good compared to many other types
Bruce's recommendation for ultimate low distortion numbers (way below any suspicion of audibility) are still expensive and uncommon 5 ppm thin film R to see better distortion numbers than the bulk foil at audio
(and some of us "conventional engineers" have seen the presentation in person at AP Audio Master Class seminars)
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It was a humorous response (along with a circuit that purports universal stability) to my comment about a vehement hatred of Zobels (which was also tongue in cheek).
There's enough on Bruce Hofer's article/powerpoint that everyone can have their, "I told you so" moment and miss the rest of the details. 😀
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