[. . . ] For more than 50 years, JBL has been involved in every aspect of music and film recording and reproduction, from live performances to the recordings you play in your home, car or office. [. . . ] Speaker Connections connection tips Speakers and electronics terminals have corresponding (+) and (­) terminals. It is important to connect both speakers identically: (+) on the speaker to (+) on the amplifier and (­) on the speaker to (­) on the amplifier. Wiring "out of phase" results in thin sound, weak bass and a poor stereo image. LEFT RIGHT ­ + ­ + ­+ LEFT ­+ RIGHT Front or Rear Speaker Outputs three. Contact your dealer or call 800-336-4JBL for a dealer near you. Troubleshooting If there is no sound from any of the speakers: · Check that receiver/ amplifier is on and a source is playing. If there is no sound coming from one speaker: · Check the "Balance" control on your receiver/ amplifier. · Check all wires and connections between receiver/ amplifier and speakers. [. . . ] 1111-CTRL1XOM A Harman International Company Steen Michaelsen JBL Europe A/S Birkerød. [. . . ]