re history question others said early pa i recall reading of a phonograph which used mechanical amplification compressed air was squirted out of a valve which was controlled by the pickup the result was noisy and distinctly lo fi but much louder than a conventional phonograph it tended to wear the disks out pretty quickly though an now deceased prof told us willing students about a project he had worked on during wwii they needed a mega power pa with very clear audio quality the purpose was to bellow at refugees from aircraft their solution was a giant compressed air source and a horn with parallel shutters worked by a small audio system i think he said it worked very well thus the war dept cancelled the project a host is a host from coast to coast wb foz skybridge scl cwru edu no one will talk to a host that s close linux unless the host that isn t close pob is busy hung or dead
