Hi Bob, I'm surprised too - however, I thought if someone didn't believe me they could very easily get a cheap metal outlet cover and try it for themselves - in their system. The $2.00 investment is certainly less than the cost of trying cords, cones, interconnects, etc. Perhaps it would help them see the light.
I'm not saying the metal cover would sound better - just different.
I'm not saying the metal cover would sound better - just different.