KB1 PEAVEY 20W PA SYSTEM. The Peavey KB 1 keyboard amp is perfect for keyboards, drum machines, backing machines, or as a PA. 20W drive an 8" extended-range speaker. 2 separate channels with a 2-band EQ per. channel and a headphone out. Headphone out. 20 watts of clean Peavey power. Legendary Peavey reliability.