User manual JBL L212

[. . . ] The L212 is ported on the front to allow placement directly up against a bookshelf or wall. Since the other CF Series models are ported on the back panel, do not place these speakers closer than 12 inches (305 mm) to the wall behind it if possible. SERIES 40°-60° Fig. 1 yarn in one conductor; thin, raised ribs on one 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 both speakers are connected identically. [. . . ] Connections are made at the terminals located on the back of the loudspeaker system. The terminals accept bare wire or dual banana plugs, either of which will provide easy, secure connections. Left Speaker Red Blk. (+) (­) 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. 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. 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 +L+R Amplifier/Receiver Fig. Recheck the minimum impedance requirements of the amp. Bass is very weak AND/OR sound seems to come from each speaker separately, without creating a stable stereo image between the speakers. 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. Experiment again with the speaker placement. If you are still encountering problems, consult your JBL dealer. POWER HANDLING Thanks to their high efficiency, JBL CF Series loudspeakers will produce reasonable volume levels in a room of moderate size with very little amplifier power. 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 power amplifier's power rating per channel must not exceed the maximum recommended amplifier power for that specific loudspeaker model. [. . . ] Do not return products to the JBL factory. GENERAL CARE The grille is held in place by pins near the edges. To remove the grille, grasp it by both top and bottom edges and pull gently. To replace, reposition it carefully and press gently at the corners. Do not push on the center area of the grille. [. . . ]