User manual JBL K2 S9800

[. . . ] K2 manual v11 approved 12/4/01 12:10 PM Page 1 Project K2 S9800 CHAPTER 1 Preface JBL wishes to thank you for selecting a Project K2 S9800 loudspeaker system. It represents the sum total of our research and developmental efforts in sound reproduction over the last half century. We have labored to create a loudspeaker system with no acoustical or electrical limitations whatsoever. While the Project K2 S9800 loudspeaker is itself a new development, the goal behind it goes right back to the earliest days of the original James B. [. . . ] Specialized wires for low frequency and high frequency sections may yield excellent results. Whatever wires are used, be sure that the low frequency wires are as short as possible and the left and right wires for each section are the same length. 13 K2 manual v11 approved 12/4/01 12:10 PM Page 14 Project K2 S9800 CHAPTER 6 Amplifier Recommendations No single type of amplifier is specified for use with the Project K2 S9800 system. The speakers are highly efficient and will operate adequately with an amplifier or receiver of 70-100 watts. However, the transient response and audio definition of a high-end system such as Project K2 S9800 will pick up all inefficiencies and distortion in an amplifier system. For full-range operation, the Project K2 S9800 system should not be used with an amplifier/receiver of less than 100 watts. Amplifiers/receivers of 100-500 watts will ensure optimum system performance. There is no effective limit to the power handling capabilities of the Project K2 S9800 loudspeakers when driven by consumer audio amplifiers. No damage will occur when used with high powered components. Source impedance is an important criteria 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 low frequency and high frequency amplifiers offer clear advantages. (If four amplifier channels are used, the high frequency amplifier may be up to 6 dB less powerful than the low frequency amplifier. Due to the power versus frequency distribution of the music, the low frequency section requires approximately four times the power of the high frequency section. ) Project K2 S9800 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 high frequency sections through short wire runs. The addition of a crossover network such as the JBLDX1 Electronic Crossover will allow the direct connection of the low and high frequency components of the Project K2 system to frequency dedicated amplifiers, and is required if the system is to be biamplified. The DX1 crossover is specifically matched to the response characteristics of Project K2 S9800 and will ensure optimum performance. The DX1 may be purchased from Project K2 S9800 specialist dealers. 14 K2 manual v11 approved 12/4/01 12:10 PM Page 15 Project K2 S9800 CHAPTER 7 Placement and Set-up Considerations The Project K2 S9800 loudspeaker system is designed to be less affected by room acoustics than conventional imaging systems. However, it is very sensitive to overall symmetry, 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 between floor to ceiling is low, it is preferable that one surface has an absorbent covering. With Project K2 S9800, it is most important to be able to accommodate the optimum listening area that is defined by the 60° horizontal/30° vertical coverage pattern of the horn. [. . . ] Treat the lacquered surface very carefully to avoid scratching the finish. To remove fingerprints and smudges, apply a small amount of ammonia-free window cleaner to the cloth and gently clean the surface. Never use any abrasive cleaners or chemicals to clean the enclosure. if the enclosure becomes perceptibly scratched or otherwise damaged, consult a qualified furniture repair shop. [. . . ]