User manual JBL GSUB10

[. . . ] Bear in mind, however, that the number of contact points should be kept to a minimum, and at the same time each contact should be as tight as possible. For the same reason, we recommend the use of the highest quality spade connectors, expertly connected to the selected cables. Spade lugs will make the best possible connection between the speaker wire and the loudspeaker system, minimizing any contact resistance that might degrade the sound ever so slightly. It is essential that both loudspeakers in a stereo system have the same polarity with respect to the input signal (are in "phase"). [. . . ] If the driver cones of the two loudspeakers do not move in the same direction for a given voltage at the input terminals, there will be a lack of stereo definition and a loss of deep bass. We recommend experimenting with the polarity of the speakers, since recordings, program sources or power amplifiers can invert the polarity of the signal. the "correct" connection is the one that yields the best audible results. Be sure to reverse both left and right connections to keep the systems in polarity. Your JBL XTi-Series speakers offer satisfying sound in a great variety of listening rooms when set up in an equilateral triangle with respect to the listener. However, careful setup will always be rewarded, and for best results we recommend placement well away from the boundaries of the room with preferably minimum 0. Your authorized JBL dealer will be happy to help you obtain the best possible performance from your JBL speakers. NOTE: New loudspeakers require a certain amount of "exercise" before they perform their best. A steady level of performance is achieved after 8-12 hours of operation, depending on the nature of the music and the level. IMPORTANT: When connecting or disconnecting loudspeakers from an amplifier, the amplifier must be turned off. For these reasons, an amplifier should only be chosen after careful listening. If it is possible to achieve the desired volume level without distortion, then the amplifier has sufficient power regardless of the rating. Fuses or circuit breakers of any kind should not be used between the amplifier and loudspeakers. All such devices will seriously degrade the sound quality and do not ensure protection from loudspeaker damage. The key to safe operation is adequate amplifier power to avoid distortion at the highest sound levels required. The JBL XTi-speaker can be fitted with "spikes" for the best possible mechanical contact to the floor. In each corner of the bottom of the speaker is a threaded insert that allows insertion of the spikes supplied with each speaker. When mounting the spikes please make sure that each spike has good contact to the floor beneath the speaker before tightening the nuts on each spike. JBL XTi-Series loudspeaker systems are finished in materials that will retain its finish for many years to come. Occasional cleaning with a clean, soft cloth will maintain the original beauty of the finish. [. . . ] To remove fingerprints and smudges, an ammonia-free window cleaner may be used. Apply a small amount to a lint-free cotton cloth and gently clean the surface. Never use any abrasive cleaners or strong chemical to clean the enclosure. If a problem is suspected, first make sure all connections are properly made. [. . . ]