Jea48,
I did the comparison tonight. It was intersting and anyone who says covers don't make a dif. probably have ears that can not hear the differences.
I compared my brass outlet, pass and seymore plastic, and a 51 cent magnetic steel from home depot. I used the same center screw and tightness for all plates.
Well, this was no contest and here are my findings
The pass and seymore seem to lack in the focus. There seem to be a loss of a little life.
The 51 cent magnetic steel seem to lack slightly in the pace and rhythem. What I did not like about it is it seem to add a sense of roughness or unnatural sound.
The brass outlet was a really sweet deal. The first thing I liked was its good pace and rythem. It was very crisp. It had a better sense of resolution to it and life and the focus was the best yet.
I then thought, why not add a second brass outlet on top of the other one to add more brass bulk for better resonance. Boy, was I wrong! Did the pace and rhythem take a big hit.
I also then messed with the position of the center screw. Having it really tight was like taking the air out of the music. Having it really loose (sticking out slightly) seem to have a bit loss in the focus. Having it tighted just by hand so it is just snug proved to be the winner.
Call me a geek...I already do!!!