What's your'e opinion about a PA amp. (transistor) like qsc or Peavey for the low frequency cabs. And tube amp(s) for midrange. ? High power tube amp.s are expencive and much of the softer tube sound is in the midrange, right ? A smaler tube amp. like marshall or peavey aren't that hard du get ( for a faire price). The same goes for PA amp's. Besides midrange speakers are often sensitive (high SPL) So 50 - 60 W should be enough. The cabinet's can be splitt with an active crossover. (som pre amp's have them built in).