The TNT review of the Supra Ply 3.4 speaker cables, includes a discussion on the benefits of tinned wire;
The Ply 3.4 makes use of 192 pure tin plated OFC copper strands in a low inductance design. The advantages of low inductance and tin plating can be summarized as follows: low inductance gives a better transient performance while the tin plating minimises the (in)famous skin-effect by acting as a semi-Litz conductor and minimises also the current jumps over oxidized surfaces of individual wires in the conductor, so to say, such a configuration works with the same advantages of solid-core cables. The tin plating is considered better than the silver plating because copper and tin "melt" together without creating a diodic barrier such as between copper and silver. Moreover the tin plating protects the OFC copper from oxidation.On another topic, are those of you with Supra cables using the screened (aka, shielded) version? TNT liked the sound of the Supras with the shield connected but, as is often the case, I found a whole bunch of comments saying shielding of speaker cables is basically BS.