User manual JBL MUSIC 2

[. . . ] But it is your listening pleasure that ultimately determines how successful we are in this endeavor. It is solely in the interest of ensuring a perfect listening experience that we ask you to faithfully follow the setup and operation procedures outlined in this owner's guide. This guide exists for several purposes. As your owner's manual, it contains all necessary background information and detailed instructions for setting up your Project K2 MUSIC 2 loudspeaker system, including unpacking the loudspeaker, selecting the correct location, speaker wire, wiring scheme and amplification, and connecting it to its associated electronics. This information will be found in Chapters 3 through 7. [. . . ] There is no effective limit to the power handling capabilities of the Project K2 MUSIC 2 loudspeakers when driven by consumer audio amplifiers. No damage will occur when used with high-powered components. Source impedance is an important criterion in selecting an appropriate unit; the selected amplifier(s) should have a very high current capacity and must be capable of driving a low impedance load. For bi-wiring or bi-amplification applications, four identical amplifiers or two dual-channel units may be used, although specialized lowfrequency and high-frequency amplifiers offer clear advantages. (If four amplifier channels are used, the high-frequency amplifier may be up to 6dB less powerful than the low-frequency amplifier. Due to the power versus frequency distribution of the music, the lowfrequency section requires approximately four times the power of the high-frequency section. ) Project K2 MUSIC 2 specialist dealers can recommend amplification to best suit individual needs. In all cases, the left and right amplifiers for each section must be identical. Make sure that the input sensitivity of the two amplifiers is equal or that input level controls are provided to maintain the proper low to mid/high balance. If two identical stereo amplifiers are chosen, each amplifier may be located near a loudspeaker and drive low-frequency and highfrequency sections through short wire runs. 11 CHAPTER 6 ­ PLACEMENT AND SETUP CONSIDERATIONS The Project K2 MUSIC 2 loudspeaker system is designed to be less affected by room acoustics than conventional imaging systems. However, it is very sensitive to overall symmetry, and proximity to walls, ceilings and corners. Ideally, any listening room should contain a combination of live surfaces (e. g. , walls and windows) and absorbent surfaces (e. g. , drapes, carpets, upholstery). If the distance from floor to ceiling is short, it is preferable that one surface has an absorbent covering. The Network Mode (Bi-Amp) Switch TM (center) should be left in the Normal position except when bi-amplification with an external electronic crossover is to be employed. The necessary crossover slopes for the K2 MUSIC 2 are very specific and bi-amping the system should only be done using factory-approved electronics. The HF Trim Switch £ (right) adjusts the high-frequency level over the range of approximately 1000Hz to 10kHz. The +1dB position gives the highest HF output and measures the most level. 0dB reduces the HF level by 1dB and the ­1dB position reduces the HF level by an additional 1dB. Although the range of these controls is rather small, each of them operate over a reasonably wide frequency range and thus have a noticeable effect on the overall tonal balance of the system. It is recommended that the system first be played with the switch in the middle position. This setting gives the most uniform measurements in a controlled environment. Of course, we are interested in producing the most pleasing sound in your environment with your choice of program material. It is, therefore, recommended that the HF Trim Switch £ be tested in its various settings on a variety of program material. Once you become familiar with their individual character, you should have no difficulty determining the setting which produces the most pleasing, natural sound in your room with your equipment. 13 CONTROLS AND CONNECTIONS CONTROLS AND CONNECTIONS BI-AMP ¡ TM £ NORMAL/ BI-WIRE +1dB 0dB ­1dB HIGH FREQUENCY TRIM (­) ¢ High Frequency (+) § Low Frequency (­) (+) Figure 9. [. . . ] If the problem remains in the same speaker, then the fault is in the loudspeaker. In this event, consult your Project K2 MUSIC 2 specialist dealer for assistance. If, however, the problem has moved to the other speaker, then the cause is in either a cable or an electronic component. IF THE SYSTEM PLAYS AT LOW VOLUMES BUT SHUTS OFF AS VOLUME IS INCREASED: IF THE SPEAKERS SOUND QUALITATIVELY DIFFERENT IN AN INDEFINABLE WAY: · Test the batteries and replace them if necessary. NOTE: The batteries should be tested once a year in any event. · Check the "Balance" control on your receiver/processor. [. . . ]