the nominal impedance of pro60s is 3ohm. my xtr 500.4 will be bridged to 250w x 2 @ 4ohm. of course ill have the gains low, but i dont know if i want to be running 3ohms on a bridged channel. so i have the option of going active, but id need to know the resistance of the tweets and woofers. BA's site doesnt have it listed. anyone know?