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Re: Audio Transmission Line Optimization



As a proffessional home/car audio installer I have to say: Buy a clue, then
attempt to join the real world. (I promise we wont bite.(unless provoked))

In Space, No One Can Hear You Snore wrote:

> Knowing that many hams are also interested in high performance audio
> systems, I thought that I should pass on this important technical
> advice offering suggestions on how to optimize your loudspeaker wires.
> Some of this advice is no doubt applicable to RF transmission lines
> also......
>
> Dan Schultz N8FGV
> -----------------------------------------------------------------------
>
>                         Wizardry With Wire
>
> At least for the present, we still need wire to connect up most audio
> equipment. Here are a few application tips on selecting and getting
> the best performance from wire.
>
> Check any good handbook of physical constants and you will find that
> silver has much lower resistivity than copper. In fact silver has the
> lowest resistivity of anything which is solid at room temperature and
> is thus suitable for making wires. However, from a cost perspective,
> the practical solution is to use thicker copper wire. Still, to avoid
> the debilitating nature of skin effects, the best solution is to use
> silver plated copper wire. Of course, not to be overlooked is the fact
> that copper is reddish, and so will tend to brighten or warm up the
> sound; while silver, being white, will tend towards a neutral
> presentation, which can be tweaked towards brightness by selective
> use of gold-plated jacks and plugs.
>
> The type of wire insulation used can grossly affect sound quality.
> For example, rubber-type insulations act as shock absorbers that dampen
> dynamic peaks (such as turning the crack of a rim shot into something
> more like a thud). They also have a high coefficient of friction which
> slows the passage of sound through the wire causing the musical pitch
> to be lower. To counteract this effect, musical groups have to tune to
> a concert A as high as 450 Hz in order to for the correct musical pitch
> to be reproduced through the sound system. The best wire insulation is
> Teflon which is a very firm material with a very low coefficient of
> friction. This allows the sound to slide easily through the wires
> without dampening the peaks or slowing it down.
>
> The colors of wire insulation should be selected according to light
> spectrum wavelengths and absorption. Generally bright colors are
> reflective. Therefore bright colored insulation will reduce high frequency
> loses by reflecting HF audio back into the wires thus maintaining clarity
> and brightness. Dark, absorptive colors should be used for low frequency
> wire insulation. By absorbing and carrying some of the low frequency energy
> dark colored insulation actually increases the effective diameter of the
> conductor - a good thing for improving the high current flow needed at low
> frequencies.
>
> You should also rack your signal sources above your amplifiers, and rack
> the amplifiers higher than the loudspeakers. This is so that the electrons
> don't have to struggle uphill through the wires to get the sound out. You'd
> be amazed at the difference that can make. Also, both speakers should be
> off to the same side of the amp, so that the loudspeaker cables are subject
> to the same Coriolis forces owing to the earth's rotation; failure to
> observe this can result in truly nasty phase shifts.
>
> Dr. Sam Gidren



--
KC7YPJ, Ryan Dorman
QTH: Victor ID, grid# DN431c
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kc7ypj@pdt.net
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