JBL K2 S9900, Product Commentaries And User Manual

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Project K2 S9900
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CHAPTER 5
Amplifier Recommendations
No single type of amplifier is specified for use with the Project K2 S9900
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 the K2 S9900 will pick up all the inefficiencies and distortion in an amplifier
system. For full-range operation, the Project K2 S9900 system should not be
used with an amplifier/receiver of less than 100 watts. High-quality amplifiers/
receivers of 100–500 watts will ensure optimal system performance. There is
no effective limit to the power handling capabilities of the Project K2 S9900
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 low-frequency 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 low-frequency section requires approximately four times the power
of the high-frequency section.)
Project K2 S9900 dealers can recommend amplification to best suit individual
needs. In all cases, the left and right amplifiers for each section must be identi-
cal. 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.
A separate crossover network (not included) can be connected directly to the low-
and high-frequency amplifiers driving this system, and is required if the system is
to be bi-amplified, although this is not recommended for the K2 S9900 system.
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