John Curl's Blowtorch preamplifier

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forr said:
About cable directionality, I once read a remark I found pertinent.
If a cable is good in one direction and bad (less good) in the reverse direction, it means that it suffers from a default in its structure. Whatever it is, it would be logical that its manufacturer cures this default before selling it with arrows on its sleeve indicating the right flowing direction for better sound.

Forr,

Interlinks with a directional arrow on one side indicate which side has the cable screen connected to the 'cold' or 'ground' terminal of the connector. For best results (lowest noise/hum) this side should be connected to the source. Thus, with such an interlink between say, a CD transport and a DAC, the arrow should point from the drive towards the DAC.

It is my belief that this perfectly good engineering was completely misunderstood and exploited to generate a considerable market.

It has, of course nothing to do with any cable directionality as a cable property.

Jan Didden
 
john curl said:
I don't understand the word 'subjectivist'. Do you mean someone who actually LISTENS to their design efforts?

Unfortunately, the meaning in plain English, which would certainly encompass your bete noirs like Lipshitz/Vanderkooy or David Moran, has been distorted to mean "people who don't use controls in subjective evaluation."
 
It is my opinion that it is important to learn from listening as much as from theory or measurement.
Actually, I don't listen to my designs as I design them. I have NEVER heard the Parasound JC-1 power amp or JC-2 preamp in my own personal system. I depend on the opinions of others for subjective evaluation. However, while I can measure 1 part in 1 million fairly easily, I have found that a good measurement is not enough. Yes, I can actually design a fairly marginal product (sonically) that measures almost perfectly. In fact, I have done it many times over the years. That is why I listen to others about 'subtle' tradeoffs and attempt to learn to do it right.
 
I believe that when I subjectively perceive something I have to find objective way to reproduce what I've perceived. And I always succeed, speaking of sound quality. Non-linearities may be measured and weighted against subjective audibility, in order to find a better compromise to minimize what error is audible instead of what one is easy measurable. If they are too hard to measure extrapolation may be used instead, but based on real objectively measured parameters...
 
janneman said:


Forr,

Interlinks with a directional arrow on one side indicate which side has the cable screen connected to the 'cold' or 'ground' terminal of the connector. For best results (lowest noise/hum) this side should be connected to the source. Thus, with such an interlink between say, a CD transport and a DAC, the arrow should point from the drive towards the DAC.

It is my belief that this perfectly good engineering was completely misunderstood and exploited to generate a considerable market.

It has, of course nothing to do with any cable directionality as a cable property.

Jan Didden

Hi Jan,
This is for balanced connections, I think. I've seen two wire cables for speakers with arrows on the sleeve made by Cyrus.
 
syn08 said:
No, but can your equipment predict if it will make my foot tap with the music? Or, in general, make any prediction about my subjective perceptions?

Uhm...., do you also have subjective perceptions? :bigeyes: 😀

I'm not suggesting to design without instruments but I see the ears / brain as an important part of testing. (May I say "trained" ears without getting shot.)
 
forr said:


Hi Jan,
This is for balanced connections, I think. I've seen two wire cables for speakers with arrows on the sleeve made by Cyrus.


No, I was specifically referring to RCA-type interlinks. You have the inner conductor for the signal and an outer conductor, or possibly a second inner conductor, for signal return. These are connected normally to the RCA's at each end. Then you have a lapped screen or something around the two conductors, and that screen is connected only at one side. For balanced connections, like XLR, you would have all 3 terminals (hot, cold, ground) connected at each end.

I wouldn't touch those speaker wires with a long pole, personally. 😉

Jan Didden
 
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