Retro 1980s audio equipment Carver C-9 Sonic Hologram Generator

Retro 1980s vintage, Carver model C-9 "Sonic Hologram Generator" made for a rack mounting. We're told that is was designed by Bob Carver (the inventor of the Phase Linear amplifiers). It is marked with a US patent number from 1980 and measures 19" wide, 1.75" high and 4.25" deep. We don't know much about this or how to test it. We plugged it in and it powers up.