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5.5
AMPLIFIER GAIN SETTINGS
In order for Divergence Shading to work properly, all amplifiers for all passbands must be set to
the same voltage gain, regardless of their power output ratings. Among other things, equal
amplifier gains are required to maintain array coherence throughout the venue.
NOTE: This does NOT mean the same input sensitivity, but the same input to output voltage
gain. Consult your amplifier manufacturer if this cannot be readily determined. Do not selectively
boost or attenuate loudspeaker levels at the amplifiers in order to achieve consistent SPL at
various distances. This is achieved by adjusting the array curvature as described above.
5.6
USER ADJUSTMENTS
5.6.1
Equalization
EAW recommends that 1/3 octave or careful use of parametric equalization be used to modify
performance to accommodate a particular program, venue characteristics, or personal taste.
5.6.2
Array Measurements
It is recommended to use a multi-channel measurement software platform to investigate the
interaction between an array and the acoustical characteristics of a venue. This is a fast, yet
sophisticated, process that will indicate problem areas due to particular venue characteristics.
Usually it is a matter of applying small amounts of 1/3 octave or parametric equalization to adjust
significant anomalies.
5.7
AMPLIFIER POWER REQUIREMENTS
As is true of all professional loudspeaker systems, the performance of the KF740 depends on
amplifiers delivering an adequate supply of clean power. Determining the appropriate power
amplifier wattage for a given loudspeaker and application is a subject of some debate. In fact,
there are three distinct issues regarding amplifier power as discussed in the next sections:
"Power Ratings," "Selecting an Appropriate Amplifier Size," and "Operating Limits."
For more information on selecting amplifiers, please consult the Frequently Asked Questions
(FAQ) portion of the EAW web site, EAW's Technical Paper on Amplifier Power also available on
the EAW web site; or contact EAW Applications Support Group.
5.7.1
Power Ratings
The KF740 is a Tri or Quad amplified loudspeaker depending on the end users preference,
requiring power for two LF, one MF, and one HF amplifier channel.
connected in parallel to a single amplifier channel or each can be connected to a separate
amplifier channel. The following tables list the rms voltage limits for the KF740.
NOTE: The rms Voltage Limit listed for each sub-system (LF, MF, or HF) is the same for any
enclosure quantity. The wattages are calculated using the Voltage Limits and the overall nominal
impedance for the each listed quantity of KF740 loudspeakers.
Section
Nominal Z
LF Side
LF Front
MF
HF
CAUTION: The rms voltage limits listed above are related to the thermal limits determined from
EAW's standard power test. In this test, transducers are "exercised" to a point of damage or
rms Volts
Wattage
8
700 W
8
700 W
8
625 W
8
200 W
74.83
74.83
70.71
40
KF740 OWNER'S MANUAL Page 9 of 22
LF sections can be
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