I'm trying to decide between the M40's and M50's. I listen to mainly acoustical music and lighter alternative. I like to hear clear crisp highs and tight bass, I don't need booming bass. I have a NAD preamp and two power amps at 240 per side, and from what I've read on the Axiom site and others is that too little power hurts speakers, not too much. So I'm also asking if 240W okay for the 40's and 50's?