he KB 4 was designed as a personal PA system in a keyboard amp. The KB 4 features separate inputs on each channel and can easily handle voice, microphones and other instruments, including acoustic and electric guitars, drum machines and backing machines, such as CD and DAT players. Other essential features include stereo effects loop, ground lift, master level, XLR balanced stereo line out, DDT(TM) defeat switch and the capability to drive an external speaker.