Some rock and pop music recordings sound good on audiophile equipment, other recordings sound better on "everyman" setups.

For sure. I have albums which sound better on my SR225 than my RS-1.

I have a question about tightening my headband. They are really loose on my head. Have any of you needed to do this? How did you go about it?

Just bend it back in with your hands, trying to keep it straight (e.g. don't twist). Don't use too much force - you can do this a few times until the fit is right. Try to keep your hands away from the ends, since you don't want anything to snap near the rods. If the fit gets too tight, just do the reverse - your ears shouldn't be pressed too hard against the driver screens. If you end up getting other kinds of pads, you might want to adjust the headband again to improve the fit.