Dielectrics and such...??


Knowing a little about something can be dangerous! Having read about poor dielectric designs, static fields, EMI…etc., I don’t know if my idea of executing some shotgun runs of speaker cables is a good or bad idea….

I want to use double shotgun runs of Kimber 4tc per speaker. Rather than twist the runs together, I want to try keeping them separated at equal width throughout the runs. My thought is to “laminate” four equal lengths of the cables together with some type of clear tape (i.e.: separate and secure four lengths of cables by an equal and consistent width throughout the run – say one-inch - by “sandwiching” all four cable between heavy clear tape).

Question: will the tape itself hinder the dialectic properties of the cables (because I assume the tape is a poor dielectric)…??

What say you electrical engineer types?

Thank you.

_Ben
2chnlben
So what else is there (other than resistance, inductance or dielectric) to consider?
Nothing else that I can think of, beyond what we've already said. I don't think that dielectric absorption will be an issue. The electric field between adjacent paralleled cables will be minimal, partly because of the one-inch distance, and partly because of the cancellation resulting from the twisted and braided construction of the two conductors in each of the four paralleled cables. Also, depending on which of the two physical configurations I asked about is used, the dielectric between paralleled cables may be mostly air, which as I understand it has essentially no susceptibility to dielectric absorption.

Total capacitance (between + and -) for a 2.5 meter run (about 8.2 feet) would be 1448 pf, somewhat on the high side but I suspect still low enough to not have audible consequences with the great majority of amplifiers.

Best regards,
-- Al
Al, that's perhaps why some manufacturers use foam Teflon (including my Acoustic Zen Absolute ICs) - not only to lower dielectric constant but to reduce absorption (introducing air). As for driving 1.5nF - I'll take your word, having limited experience.
Hi Ben, here is my experience. I have Kimber 3033 and tried to protect them from dust by wrapping them up in a thin plastic sheet, those used to keep food in the fridge.

Result was a huge change in sound for the worst. Harsh, unmusical,..., forcing me to remove it. Once done, good sound returned.

I admit I covered the whole lenght of the cables with the plastic sheet. Maybe using a short lenght of tape might not have the same effect.

Good luck.

Chema
Jbuenech - that's good input and certainly makes me rethink my original strategy.

Al and Kijanki - You guys are both so knowledgeable and I always look forward to your intelligent responses.

The Kimber 4tc, as you likely know, is comprised of multiple twisted ("braided") wires including both the positive and negative runs. I want to use each "braided pair" (one complete run of the 4tc) per speaker terminal (2 runs - one to each of the top/bottom positives, and 2 runs - one to each of the top/bottom negatives). My thought was to run the four runs parallel and evenly spaced. Perhaps I should twist the runs.

Please help me determine the best approach to twisting:

1) twist the top negative and top positive separately and twist the bottom negative and bottom positive separately.

2) Do step (1) - above - and then twist those two "twisted pairs" together to form one large twisted run (with all four cables).

3) Twist the two positive runs together; twist the two negatives together; and then twist those two twisted pairs together...

4) Don't twist - run parallel/evenly spaced.

5) Other...

Thanks guys.

04-04-12: Jbuenech
I have Kimber 3033 and tried to protect them from dust by wrapping them up in a thin plastic sheet, those used to keep food in the fridge. Result was a huge change in sound for the worst.
I suppose the reason for that might have been static electricity on the plastic sheet, which is a possible issue that I hadn't thought of when I composed my previous responses. Not sure how or if it may be possible to quantify or predict that risk.

Ben, Digikey has a selection of tapes having anti-static properties, which it would probably be a good idea to look through. Under "tape type" select one of the three anti-static entries, and then click "apply filters."

Best regards,
-- Al