I run mine active. The mids are 3 ohm and are getting about 225w each right now, and they have never missed a beat. The tweets are 8 ohm and are only getting about 40 watts each, and they scream. I'm not sure how much power is lost running them through the passive crossovers, but I do know that gobs of power can fry lesser crossovers, so it's a testament to their crossover design that you can even power them that way.as say what said...they are power hungry speakers for sure. i have 300w a piece on mine and they've been taking it for as long as ive had them, everyday, maxed out.
i will say this. ive READ that most of the power is lost through the xover. supposedly the speakers are pretty average in efficiency, its just you need all the extra power because of the xover. how true is this? i dont know. but again, supposedly running them active GREATLY reduces the amount of power you need to the speakers.
I recently purchased one of the new JL HD amps, the 600/4, so within the next week or so, I'll be sending the mids a solid 300w each actively.
I am thrilled with the performance of these Pro60s. I've been jamming them hard for almost two years now with no problems. They get very loud and sound great doing it.