JBL Project Everest DD65000 Product Commentaries And User Manual

Contents

29amPLifierrecommenDations5 No single type of amplifier is specified for use with Project EverestLoudspeaker systems. The speakers are highly efficient and willoperate adequately with an amplifier or receiver of 70 – 100 watts.However, the transient response and audio definition of a high-endsystem such as Project Everest will expose all the inaccuraciesand distortion in the electronic chain that precedes it. For full-range operation, Project Everest loudspeaker systems should notbe used with an amplifier/receiver of less than 100 watts. High-quality amplifiers/receivers of 100 – 500 watts will ensure optimalsystem performance.There is no effective limit to the power handling capabilities ofthe Project Everest loudspeakers when driven by consumer audioamplifiers. No damage will occur when used with high-poweredcomponents. The selected amplifier(s) should have a very highcurrent capacity and must be capable of driving a low-impedanceload. Low output impedance is also an important criterion inselecting an appropriate amplifier.For bi-wiring or bi-amplification applications, four identical amplifiersor 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 amplifiermay be up to 6dB less powerful than the low-frequency amplifier.Due to the power-versus-frequency distribution of music, theloudspeaker’s low-frequency section requires approximately fourtimes the power of the high-frequency section.)Project Everest dealers can recommend amplification to best suityour individual needs. In all cases, the left and right amplifiers foreach section must be identical. When bi-amping or bi-wiring,make sure that the input sensitivity of the two amplifiers is equalor that input level controls are provided to maintain the proper lowto 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.If you are bi-amping the loudspeakers, a separate electroniccrossover network (not included) must be connected to theoutputs of the preamp/processor and to the inputs of theamplifiers that are powering the loudspeakers’ low-frequency andhigh-frequency sections. Refer to HF Drive/LF Drive in Chapter 7,for more information.