Hi ! I have a Peavey 60/60 watt tube amp. (2 x 6L6 tubes pr. channel) Driven by an alpha tube preamp. I am using one of the channels to drive a 2x 10" system. I would like to add a larger 1 x 15" or 1 x 18". And used the built inn crossover ano channel for the 15" and another for the 2 x 10". How does tubeamps controll / manage larger cone speakers ? I don't mean sound level, but more about "starting and stopping" the speaker. The reason that i am asking is that in another band i used to play, we discoverd that som of the smaler power amps. Did not handel the 18" very well. Do i need a larger power amp (tube or transistor ) ?