Manual JBL Project Everest DD67000 (page 15 of 26) (English)

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AMPLIFIER

RECOMMENDA TIONS

No single type of amplier is specied for use with Project Everest

Loudspeaker systems. The speakers are highly efcient and will

operate adequately with an amplier or receiver of 70 – 100 watts.

However, the transient response and audio denition of a high-end

system such as Project Everest will expose all the inaccuracies

and distortion in the electronic chain that precedes it. For full-

range operation, Project Everest loudspeaker systems should not

be used with an amplier/receiver of less than 100 watts. High-

quality ampliers/receivers of 100 – 500 watts will ensure optimal

system performance.

There is no effective limit to the power handling capabilities of

the Project Everest loudspeakers when driven by consumer audio

ampliers. No damage will occur when used with high-powered

components. The selected amplier(s) should have a very high

current capacity and must be capable of driving a low-impedance

load. Low output impedance is also an important criterion in

selecting an appropriate amplier.

For bi-wiring or bi-amplication applications, four identical ampliers

or two dual-channel units may be used, although specialized low-

frequency and high-frequency ampliers offer clear advantages.

(If four amplier channels are used, the high-frequency amplier

may be up to 6dB less powerful than the low-frequency amplier.

Due to the power-versus-frequency distribution of music, the

loudspeaker’s low-frequency section requires approximately four

times the power of the high-frequency section.)

Project Everest dealers can recommend amplication to best suit

your individual needs. In all cases, the left and right ampliers for

each section must be identical. When bi-amping or bi-wiring,

make sure that the input sensitivity of the two ampliers is equal

or that input level controls are provided to maintain the proper low

to mid/high balance. If two identical stereo ampliers are chosen,

each amplier 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 electronic

crossover network (not included) must be connected to the

outputs of the preamp/processor and to the inputs of the

ampliers that are powering the loudspeakers’ low-frequency and

high-frequency sections. Refer to HF Drive/LF Drive in Chapter 7,

for more information.

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JBL Project Everest DD67000 Manual

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