User manual JBL L65

[. . . ] Every room is different and there are different tastes, so don't hesitate to experiment on your own. 40°-60° Fig. 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. [. . . ] 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. This will help maintain proper signal balance. (For the MR Center, determine the length needed from AV receiver's center channel output to speaker). Strip off 3/8" of insulation from both ends of each conductor. Twist each set of thin wires into a tightly-bunched spiral. At this point you need to identify a visual difference between the two conductors of each molded pair of speaker wire. Differentiating marks can be a different color wire (copper or "silver"); a strand of yarn in one conductor; thin, raised ribs on one Fig. 2 3 part of the outer insulation; or a printed "+" marking on one of the insulators. It does not make any difference which of the two strands of wire go to (+) and (­) on the speakers and amplifier, as long as all speakers used in your system are connected identically. 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. Please see the specification section for details. Following these guidelines will provide virtually distortion-free sound reproduction and long loudspeaker life. No sound from one speaker 1. Balance control turned all the way left or right. 2. 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. Speakers are too far away from back and side walls or too far apart. [. . . ] AV receiver/amp "audio direct" switch is activated. This switch should be off to activate the 5 speaker surround mode. 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. If purchased outside the United States, contact your local distributor to make arrangements for repair service. [. . . ]