Retail store services featuring apparatus for the transmission and reproduction of sound, amplifiers, loudspeakers and speakers

acoustic couplers; audio speakers; car sound amplifier; amplifiers; sound reproduction apparatus; sound transmission apparatus; acoustic arm for communication apparatus, namely, tone arms for record players; sound box in the nature of an audio speaker; speaker enclosures; acoustic conduit; diaphragms in the nature of electroacoustic transducers; audio sound receiver; acoustic pipes being couplers