Hi Gang, Newbie here. My neighbor is ready to upgrade his bass rig. He has a 200w newer model Fender Bassman combo with 1x15 that is about dead. He is looking at a GK 4x10 cab, but is afraid that 10" speakers won't give him the bottom end he wants. What is the general opinion on 15" speakers vs a 4x10's? Will he get the Boom Boom that he wants for playing STP and Ozzy?