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RE: Cable terminations

Hi

You excluded an effect a shield (which end is connected if not a complete circuit) may have on a high impedance (signal) cable so I would assume your talking about a speaker cable?

I can't think of anything that would make the cable itself have preferred direction where an alteration of the signal takes place differently if driven from the opposite ends. When you are concerned with frequencies many octaves above 20KHz, all the wires properties become important or governing higher yet in frequency. I have not heard of any reference to preferred direction in an RF cable.

So that brings up the experimental process. A RULE is do not change more than one thing when you compare A to B. You are sure you hear a difference but the issue is "was the difference because of the wire?"
"Was the difference because of 4 different / new electrical connections?"

Since what you "hear" is partly what you see and already know, we all feel our hearing is pretty good yet like vision, color perception and our ears frequency response, we are all pretty different and we know nothing else, no other frame of reference..

Worse, comparing two amplifiers or two signal paths where one can switch quickly, you find our acoustic memory is quite short, after that we have a fading memory of what we think it was.

At the beginning of the company where i work now, we /I wasn't sure that making a horn speaker that radiated like a single driver was worth the hassle. Also how to identify problems when there was nothing in a measurement that pointed a direction.

This was using an olden days test for recording tape and electronics called a generation loss test. You play music of your choice through a speaker and record it with a measurement mic, then play that back through the speaker and record it again. Each time, the flaws that stop it from being faithful to the signal are exaggerated. Most loudspeaker are UN-listenable by 2 generations some on the first pass.
This did not tell you what to fix in the design process but it sure made it stand out so you knew were it was.

Anyway, this might be a way to figure out what the directional effect is.
If you have access to a (flat) measurement mic and decent usb interface you can make this kind of recording in your room, just put the mic close to the speaker to minimize the room contribution. Then compare the effect of the cable going one way, then the other and what the differences are are greatly exaggerated after a couple generations.
Tom Danley



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