Attached. Looks like tinned copper and had some around. Will I notice any differences in bare copper vs this?

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It would probably work but solid copper would be best. It all depends on how acute your hearing is and the speakers you have. I used 16AWG 2-wire heater cord wire for wiring my first HTS and it worked very well. The speakers weren't the best in the world but if there was any drop in fidelity, I couldn't hear it. I kept my wiring length under 25' for the side channels.

Sure, they'll work just FINE....


Why would you prefer Solid copper [i.e. House Electrical Wire]????? Almost ALL Speaker Wires on the market are Stranded Wire....

I should have been more specific with my solid copper wire statement and mentioned stranded solid copper, not meaning to imply a solid, single copper wire like electrical wire. It was meant to distinguish copper wire from tinned copper wire.The heater cord wire (which was stranded) was used because it was $0.13 per foot, I needed it quickly, and the store was close to my house. I have since re-wired the downstairs HTS with stranded, solid copper speaker wire and used the same wiring scheme for the new upstairs HTS.

You can use any wire you want. There is NOTHING special about standard speaker wire.

For a speaker cable there is no electrical difference between solid conductors and stranded conductors, nor between tinned copper and bare copper.
Many people like the flexibility of stranded conductors.
The cable in the first post has an un-needed foil shield.