A combination speaker and amplifier unit has speaker located on the front of a cabinet and speaker wire receptacles located in the back of the cabinet for providing speaker wire connections to a stereo unit. Also in the back of the cabinet is a power booster amplifier mounted thereon for amplifying the...http://www.google.fr/patents/US5546468?utm_source=gb-gplus-shareBrevet US5546468 - Portable speaker and amplifier unit
