Best used speakers around 500 for clasic rock

I second the NHT 2.5 ! They will make you beg for mercy !

Dude, glad to hear you are a rocker. I agree that any of the older Infinity Kappas are great at rock (kappa 9, 8 or 7), but be advised that replacement parts for those special "emit" drivers are tough to get so think about this carefully. But you can't go wrong with a Klipsch, those suckers ROCK baby! All of their older models are awesome with rock, especially if you like drums and impact, try Cornwall, Heresy, etc... Also you might try to pick up a pair of Snell Type C. I would also recommend the old Polk audio SDA series speakers, they range from small to huge, but they all rock. Good luck and have fun.

You might wan't to check out some British speakers like some of the older Mission 700 series. They were designed to be placed up against a wall. Maybe a couple of the Castle models that are currently on sale might work as well. They can also be placed near a wall. They say the build quality is excellent on the Castle's. I believe they make some of the cabinets for Proac also.

I have the JBL L-96's and the L-112's and L-100's have even better bass...You can have one hell of a rock speaker for little money...plus they have great accuracy and good soundstaging,,,,so you are actually getting a pretty good quality overall...

Klipsch. On tubes if you can get there. Rock on!