i highly reccomend not buying them. i ordered a set, to do my second setup ever. first set the magnets ,wich are sandwich mounted between two plates had shifted thanks to UPS, looked like someone had stomped them, when i depressed the cones they stuck down. so i sent them back and the second set seemed ok. they overheated on 275W (rated for 500 rms) in 2 minutes in a 1 cube sealed enclosure, which was recommended.