Playing on stage live I've yet to see anyone who is or has created best of both worlds pun intended "EvH" both front of houseand and live cabinets pushing air to appease us TUBE addited speaker tweakers to achieve CONTROLLED FEEDBACK from low to high harmonies or vice versa....? Anyone? I've ordered Seymours Powerstage 700 class D for my K. Stage. Correction, Controlled feedback harmonies "or" OUT OF CONTROL feedback applies as well. lol....Help...