User manual JBL LXE990

[. . . ] Because the LXE tweeter faceplate has no concentric or parallel lines, it produces high frequency signals without diffraction. 2 PLACEMENT 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 them, at the listening position, is between 40 and 60 degrees (see Fig. For example, if your listening position is 8 to 12 feet (2. 5 to 4 m) from each speaker, the two systems should be about 8 feet (2. 5 m) apart. Placing the loudspeakers in corners or against a wall will result in the strongest (not necessarily the most accurate) bass. [. . . ] 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. Push down on the button below the terminal and insert the wire, or the banana plug, through the hole. For each channel, the red terminal on all loudspeakers should be connected to the red or (+) speaker connection terminal on the receiver or amplifier, and the black to the black or (­) (see Fig. Connecting the loudspeakers in this manner ensures that they will be in phase; that is, work together rather than in opposition. Connecting the loudspeakers out of phase will not damage them, but will result in less bass and poor imaging. Left Speaker Red Blk. (+) (­) 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 distance between the most distant speaker and the receiver or amplifier. Now make the hookup wires for both speakers this length, even if one LXE Series loudspeaker is much closer to your amplifier than the other. 2 Hooking Up Multiple Sets of Speakers If your receiver has two complete sets of speaker terminals ("A" and "B"), it's possible to hook up an additional pair of speakers for simultaneous sound in another room. However, some speakers may not be usable as a second pair if you want to play two sets at once. Before hooking up another set of speakers besides your LXE Series, check the following: 1. Impedance is always expressed in ohms and can be found in the owner's manual that came with your unit. For example, the following are typical entries in amplifier/receiver owner's manuals: A) 100 watts RMS into 8 ohms, both channels driven, 20-20kHz with less than 0. 02% THD. [. . . ] Do not use any cleaners or solvents on the speaker drivers themselves. SERVICE Should your loudspeaker ever need service, return it to the JBL dealer from whom it was purchased. If for some reason this is impractical, in the United States, call 800-336-4JBL for your nearest warranty station. Military personnel who purchased from authorized military outlets should return them to a similar outlet or contact: Mohawk Marketing Corp. [. . . ]