You just made my point. You've de-crypted what I was saying about faith. There is faith, and then there is knowing. A big difference. I have experimented with safety wire to run speakers, aluminum, aluminum foil and I can say without a shadow of a doubt that the changes in sound character are pretty substantial. You can still hear everything, it just sounds different. Why? well this could be an explanation:
Skin depth=
.where
ρ =
resistivity of the conductorω =
angular frequency of current = 2π × frequencyμ = absolute
magnetic permeability of the conductor
But I think there may be more variables to the sonic changes that occur. Here is pretty much how iron fares in high freq (more than 60Hz):
In a good conductor, skin depth varies as the inverse square root of the conductivity. This means that better conductors have a reduced skin depth. The overall resistance of the better conductor remains lower even with the reduced skin depth. However this means that there is less reduction in A.C. resistance when substituting a metal of higher conductivity, compared to the reduction of D.C. resistance, when its diameter is larger than the skin depth for that frequency.
Skin depth also varies as the inverse square root of the
permeability of the conductor. In the case of iron, its conductivity is about 1/7 that of copper. However being
ferromagnetic its permeability is about 10,000 times greater. This reduces the skin depth for iron to about 1/38 that of copper, about 220
micrometers at 60 Hz. Iron wire is thus useless for A.C. power lines. The skin effect also reduces the effective thickness of
laminations in power transformers, increasing their losses.
Iron rods work well for
direct-current (DC)
welding but it is impossible to use them at frequencies much higher than 60 Hz. At a few kilohertz, the welding rod will glow red hot as current flows through the greatly increased A.C. resistance resulting from the skin effect, with relatively little power remaining for the
arc itself. Only
non-magnetic rods can be used for high-frequency welding.
If it doesn't matter what type of wire we use on our stereo, then why not just sell coat hangers instead of copper? Coat hangers are mostly iron. I have allot of safety wire laying around and it would be great to put it in a teflon jacket and to use it for speaker wire, but I haven't convinced myself that it would be a better material to use than a good quality copper, or better yet silver, but silver is not worth the extra money since the differences can be attenuated with a good EQ, IMO.
Some of the sounds I hear when using poor conductors for wire can be described as very thin and deleted highs, raspy boxy sounding mids. Those sounds are extremely apparent and ever present.
But who will use iron or aluminum for wire when a good cheap copper wire can be had at any store. For me it is vastly more important to have a good quality connector that won't corrode, since I am in Hawaii. Here I have even seen plastic "rust". So for me a good "audiophile quality" RCA wire and some good pure copper with tinned terminations are important to me.
If someone askes me if I did a blind test on all these wires, I will say I had my eyes wide open the whole time.