Zimm, what are you talking about? Tin is a metal with much higher electrical resistance than copper and as far as is known is never used in the electrical wire commonly bought for connecting speakers. It may be called by such generic names as "lamp cord", "power cord", "speaker wire","zip cord", etc. but in all cases it's better than 99.9% pure copper. My own usage has always been 16ga lamp cord connected directly to receiver and speaker terminals.

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Enjoy the music, not the equipment.