User manual JBL L65

[. . . ] 1 PLACEMENT Bookshelf Models: For the best stereo reproduction, the two loudspeaker systems should be an equal distance from your listening position and separated so that the angle Tower Models: The Tower models cabinet height and driver placement allow for speaker placement directly on the floor. For the best stereo reproduction, the two loudspeaker systems should be an equal distance from your listening position and separated so that the angle between 2 MR SERIES LOUDSPEAKERS them, at the listening position, is between 40 and 60 degrees. For example, if your listening position is 8 to 12 feet (2. 5m to 4m) from each speaker, the two systems should be about 8 feet (2. 5m) apart. Center Channel Model: As the center channel contains the dialog and other central action sounds, the speaker should be located very close to the Monitor/TV and centered with the Monitor/TV's center line. [. . . ] In Case Color Interference Occurs: The speaker is shielded to work with video applications, however some color interference may be observed on the TV screen depending on the type of your TV set. If color interference is observed, turn your TV off for 15 minutes and move the speaker back about 1" from the front edge of the TV. If this is not far enough, move back further and experiment until the interference disappears. You may have to turn the TV off for a few minutes and turn it on again to clear the screen. (2 ft. or less) CONNECTIONS To connect the loudspeaker systems to the receiver or amplifier, use twoconductor insulated wire. Your JBL dealer can recommend suitable cables, or you can buy wire at most hardware or electronic stores. If your speaker is more than 30 feet (10m) from your receiver or amplifier, use larger diameter lower gauge wire. Connections are made at the terminals located on the back of the MR Series speakers. Preparing the Hookup Wire Carefully plan your wire lengths before cutting any speaker wire. Be sure to allow plenty of extra wire to help hide paths in corners, along baseboards, etc. 1. For Left and Right Speakers, first determine the wire length needed between the most distant speaker and the receiver or amplifier. Now make the hookup wires for both speakers this length, even if one loudspeaker is much closer to your amplifier than the other. However, using a small amplifier to obtain the desired volume listening levels may lead to overdriving the amplifier. This will generate high distortion levels and may cause damage to your loudspeaker. For the best performance, an amplifier should be selected with an output rating that is greater than the maximum power that will be used. This margin of reserve power will ensure that the amplifier will not attempt to deliver more power than its design allows. However, the amplifier's power rating per channel must not exceed the maximum recommended amplifier power for that specific loudspeaker model. Following these guidelines will provide virtually distortion-free sound reproduction and long loudspeaker life. No sound from one speaker 1. One of the connections between sound source and amp/receiver is faulty or has become disconnected. Both speakers play at low volumes but shut off as volume is increased OR sound turns on and off intermittently A few strands of speaker wire may be shorting out. Bass is very weak AND/OR sound seems to come from each speaker separately, without creating a stable stereo image between the speakers. 1. The polarity (+ & ­) of one speaker has been reversed relative to the other. Additional Areas to Check When Using an AV Receiver: No sound at all or very faint sound from the center channel or other speakers 1. Speaker wire has become disconnected. TROUBLESHOOTING The vast majority of new speaker "malfunctions" end up being traced to connections or switch settings. [. . . ] Amp/receiver tape monitor button pushed in while using CD, FM or phono inputs. 5 2. One of the connections between sound source and AV receiver/amp is faulty or has become disconnected. Rear/surround information may not be recorded in some scenes and passages. Sound source (VDP, VCR, CD, cassette deck, turntable) not turned on, not activated, not hooked up or not selected on AV receiver/amp front panel. SERVICE Should your loudspeaker ever need service, return it to the JBL dealer from whom it was purchased. [. . . ]