What is claimed to happen with OFC wires is that during manufacture, oxygen is not allowed to attack the crystal boundaries (what happens in service life, is another matter).
It is at the crystal boundaries that the unseen diodes are supposed to be formed.
OFC strands unless protected by other means, surface oxidize as non OFC strands.
George
Tried to play with that kind of things in 1968, with a double moving coil Loudspeaker from GEGO.
Traditional motor at the back of the speaker, a second moving coil/little magnet assembly in front of the cone.
I gave-it up.
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And, I am sending HD audio/video over unshielded ac power wiring, too. PLC. Works just fine. [Giving a little something for everyone.]
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Easy reduction in speaker THD -
An easy way to get the bass thd lowered in a driver is to return the neg speaker wire thru (in series) with the resistor which goes to ground in the gain setting R's of the power amplifier. Works well, cheap and even extends the bass lower at the same time. Just one resistor is added. [published in TAA and showed before and after results] Thx-RNM
An easy way to get the bass thd lowered in a driver is to return the neg speaker wire thru (in series) with the resistor which goes to ground in the gain setting R's of the power amplifier. Works well, cheap and even extends the bass lower at the same time. Just one resistor is added. [published in TAA and showed before and after results] Thx-RNM
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Richard, were you part of the input on the power amplifier made by Audible Illusions, 25years or so ago? It had one of those connections that you are referring to.
negative effects was worse than positive adds.
Plus: Better damping, extended bass response, less distortion at low frequencies and low levels.
Minus: Complexity, stability, and, worse of all, power limitation. And increasing distortion at higher frequencies due to cone fractioning under the brutal signals send to dump the cone resonances.
I live out in the woods... Very low density population here. I cant even use a cell phone out here. And, really, really quiet and peaceful. Just what I need after a hectic vacation.
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It was another give away - like dc servo control. I published it and so anyone could use it. If others here missed it, try it. Thx - RNM
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thx - Ambisonic
I had forgotten all about it... must have a copy here somewhere.... it was actually part of an article on a low feedback power amp design with very low thd. And, I threw that into it. I have been reacting/recalling from things people bring up here... it triggers something I did which I can contribute or throw into the mix.
BTW-- speaking of Ambisonic -- A multi-part series by W.Sommerwerek is in TAA... starts with part #1 in issue 3/84. The last part (1985-86?) is to have the schematic for diy building. That can be the basis of a revival with new descrete or opa circuits to go along with the microphone talked about here. To me, I have not seen in my life time any better way and it deserves to be kept alive until it catches fire. Lower cost can do that. Thx-RNMarsh
I had forgotten all about it... must have a copy here somewhere.... it was actually part of an article on a low feedback power amp design with very low thd. And, I threw that into it. I have been reacting/recalling from things people bring up here... it triggers something I did which I can contribute or throw into the mix.
BTW-- speaking of Ambisonic -- A multi-part series by W.Sommerwerek is in TAA... starts with part #1 in issue 3/84. The last part (1985-86?) is to have the schematic for diy building. That can be the basis of a revival with new descrete or opa circuits to go along with the microphone talked about here. To me, I have not seen in my life time any better way and it deserves to be kept alive until it catches fire. Lower cost can do that. Thx-RNMarsh
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So, you too had played with kind of servo for Loudspeakers ?
Did-you still use it nowadays, or gave-it up, like me ?
For the same reasons, if you gave-it up ?
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That's a very good series of articles by Sommerwerck, 3, 4, and 5/84. I haven't seen the later one yet but I must have it somewhere.
You have to read the paper though IIRC, we didn't publish the parameters of the cables tested cos it was only an interesting side issue to the main speaker listening tests.
In dem days, 'Low Ls' was done by introducing loadsa evil C and these had adverse audible effects at HF, especially with Golden Pinnae amps. Dunno how 'Low Ls' is done this century.
The cynical might conclude that you just have to get the x-section of Cu high enough to beat the zillion $/ft cables 😀 A more useful recommendation might be to have the PAs at or built into the speaker & run evil balanced line level instead but that has its own problems.
Much later, 90's, we lent the cables to a well known UK HiFi mag for a mass review. The editor told us they easily beat all the Golden Pinnae cables but didn't feel it was appropriate to report in the mag.
BTW, the techniques in Absolute Listening Tests - Further Progress are quite simple and one wonders why no one had done anything similar before. The results when you REALLY investigate obvious stuff with Blind Listening Tests are often surprising.
Blind Listening Tests don't actually pooh pooh the differences in cables etc. They just show that the most accurate, best sounding, bla bla cables, preamps, PAs, speakers are often NOT the ones the Golden Pinnae brigade claim.
JC, as Blowtorch is no longer sold, why not publish the schematic? I'm sure many people have stuck with this huge thread(s) in the hope that you might lighten all mankind with this pearl of wisdom. No irony or sh*t stirring meant. It's just my lack of facility with English as she is spoken
Publishing the schematic is unlikely to affect your present or future finances.
Unlike putting it in a Blind Listening Test .. which I fully understand though I bemoan the chance to sample a 1st cru Burgundy again before my demise. 😡
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If I may ask another 2 questions .. again without any sh*t-stirring motive.
How long does it take for a Golden Pinnae or even a member of the unwashed masses like us to distinguish Blowtorch from lesser designs and appreciate its unique strengths? In sighted, no stress listening as specified by the designer of course. 🙂
Which 1980's Mark Levinson power amps were you involved with?
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Those who have bothered to read through the thread know that this has been answered several times already. Those who haven't, regular as clockwork, appear every couple of months, attack John Curl, then lose interest. Gets old sometimes.
Chris
Thanks for this George. Good to see people have been busy while I've been in the bush 🙂 Rythmik seemed to have picked up my point about temp. affecting DC resistance but I think David Birt's solution is more elegant.
I'll get my lawyers to see Yamaha et al for infringing my Powered Integrated Super Sub patents. 😀
The Dynamic Duo are Stan Lipsh*tz & John Vanderkooy, the High Priests of ABX and other good stuff. But their ABX team also have at least one of the best ears in the business.
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Mr. Marsh, I tried this in the 70's and it was old then. There was a very old Wharfedale Engineering Memo with test results too. As you say, 1 resistor.
Anyone got a copy of TAA article?
It's the great grandfather of the supa dupa ACE stuff.
I'm not sure you get bass extension though you get other good stuff.
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