That's different than combining 2 different wires; that's SPC, Silver Plated Copper. A lot of people use that because its cheaper than just Silver wire. What is a problem is if you use Copper for ground, and SPC for others, because they may have different conductances and such, and you may get a variation between the two. You just need to use commensurate wire when building cables. Use all wire from one batch from one company in a cable, SK you can ensure that they are all identical.
My cables are all SPC, I like it because its cheap enough, and it makes me feel like I'm not cheaping out
26 AWG 7N Pure UP-OCC Cryo Stranded Silver + Copper Type 2 Litz Custom Wire
This custom wire is our 26AWG 7N Pure Silver plus 7N Copper type 2 litz wire, made in collaboration with those who created “UP-OCC” wires. This new and unique wire features 3 enamel-coated groups of Pure Silver and two groups of Copper inside containing 10 strands in each for not only decreasing electrical anomalies (i.e. skin and proximity effect) but prevent oxidation to maintain same appearance after very long use, increases durability greatly, and sound quality improvements through its configuration. We designed the wire in “SSSCC” configuration to offer more concentrated, concise sound. It utilizes PE insulation for flexibility and durability, and are cryo-treated for long lasting, enhanced sound quality.
I am talking about this silver + copper wire but not a SPC.
I am thinking of whether I can combine a silver and a copper wire to serve the purpose as this plussound wire does.