G, you should enjoy excellent sound from your M50s and QS4s. Time to again cite(it's been 6 minutes since Rick has done it) Mr. Russell's excellent article on speaker wire. From the table you can see that your present in-wall wire is adequate. There's no good reason to go to the trouble of changing and no difference in sound will result.

Last edited by JohnK; 05/10/05 01:59 AM.
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Enjoy the music, not the equipment.