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Re: SoundPiper Tubular Speaker Conductors

209.215.72.226

Posted by Jon Risch on July 24, 1999 at 17:34:02

In Reply to: SoundPiper Tubular Speaker Conductors posted by Robert A. Genna on July 23, 1999 at 21:19:32:

As Rod indicated, we do not allow advertising to be done as posts here. Unless of course, you are giving them away free, because the idea is just so awesome that you wanted to insure we all had a shot at audio nirvana.

Rather than delete your post, I felt it would be more punishing to comment on the concepts behind these 'soundpipers' of yours.

First, anyone can go down to the hardware store and get some gas line copper tubing, and have there own 'soundpipers'. The issues here are: copper purity, freedom from surface oxidation, and long term stability of the copper surface. You do appear to have addressed the long term issue by coating the pipes, but what assurance is there that they won't corrode after a period of time, espcially if they were just sprayed with acrylic or laquer (neither of which is a great dielectric) after being sanded and possibly polished. The polish or sanding could have damaged the surface of the copper.

Second, speaker cables don't care about capacitance, the parameter of importance is low inductance. By spacing your pipes apart so much, they will have a relatively high inductance, and would as a consequence tend to sound soft and dull, unless of course, the copper in the pipe was of such an impure grade that they had some false brightness due to that, but two wrongs don't make a right.

Third, it is likely that the pipes might sound better if filled with sand, so as to damp any tendency toward mechanical resonance, which with such large and relatively heavy runs of copper, would tend toward a lower register twang. Any livelyness you hear is probably due to said resonances, and represent a deviation from accurate signal transfer and neutrality.

Fourth, these rotatable leads don't sound like very good connections, and if they truly pivot, then the contact CAN'T be that firm or low resisitance. If they are merely flexible leads, then at the very least, you now have a discontinuity from your tubular profile, and possibly a solder joint, at best a crimp, and maybe worst of all, a bolt or other mechanical connection that will corrode and oxidize over time.

Doesn't sound like anythig worth giving up zip cord for to me.

Jon Risch

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