Towering, overpowering power. With guts enough to challenge infinity. Thats what it takes if you're performing outdoors. There's no second chance. No walls to bounce the sound off. You'd better have enough power the first time round.
Late sixties amplifier advert featuring country musician Joe Maphis
Late sixties Standell advert, for solid state amplifiers, implying they are the amplifiers for the next 200 years!