this system, when there were no audio service companies yet, was called "voice system" because at that time (60s/70s") they did not amplify the drums, guitar and bass (they had their own amplifier), only the singers' voices and maybe the keyboard ... so here we have a "control unit" (its true definition of the time) that acts as a mixer with tape echo, valve amplifier, and preamplifiers, all inside a portable container with 4 legs that are mounted and becomes like a small table ... then we have the 2 speakers (called at that time "columns") that rose from the ground with iron supports (tripods) to let everyone hear the sound well ... objects that have been standing still for a long time now. ideal for collectors, or for use after a thorough general overhaul ... not tested ...