I suggest you review this comprehensive article on Roger Russell's McIntosh history website. This article goes into great details and what McIntosh did to "test" wire to determine the facts. A matrix with speaker wire gauge and recommended max lengths is in this link; you'll have to wade through it to find it. Much interesting information.
Don't spend thousands on wire; let people that want to throw away money do that.
http://www.roger-russell.com/wire/wire.htm
Don't spend thousands on wire; let people that want to throw away money do that.
http://www.roger-russell.com/wire/wire.htm