KLING & FREITAG K&F ACCESS T9 - Manual (Page 39)

User’s Manual ACCESS SYSTEM
KLING & FREITAG GMBH ©1995-2009 Version 6.0, 17.03.2009 Page 39 of 60
5. 1 Power Amplifier for 2 x B5:
2 x 1200-1400 W RMS (1700 W peak) / 4 Ω
1 x Controller K&F C5/9
6. 1 Power Amplifier for 1 x B10:
2 x 700-1000 W RMS (1000 W peak) / 8 Ω
1 x Controller K&F C5/9
7. 1 Power Amplifier for 2 x B10:
2 x 1200-1600 W RMS (2000 W peak) / 4 Ω
1 x Controller K&F C5/9
11.1 Correct Bass and Top Speaker Ratio
When making adjustments on the power amplifier, it is extremely important that the
volume levels for the top speakers T5/T9 and the amplifiers for the bass systems are
correct.
The C5/9 Controller is designed so that when a top speaker T5/T9 and two ass speakers
B5 are combined, the power amplifier’s gain for the tops should be approx. 3dB lower
than the gain of a bass power amplifier in stereo- and dual-mono operations (with level
controls at maximum).
This ratio can change with other configurations. One reason for this is the different
dispersion coverage of bass and mid/high speakers. When the number of basses is dou-
bled, the volume of basses set up next to each other can increase by max. +6dB (+3dB
efficiency and +3dB from doubling the amplifier’s power). The level of the tops does not
increase in this manner because of the directivity.
The position of a bass speaker has a large influence on the actual volume. A bass
speaker on the floor can be a few decibels louder than a flown bass system because of
floor reflections. Because of this, the sound engineer must always do some fine-tuning
on the amplifier controls (not on the mixing console!) when tuning the system.
The gain of the power amplifier is generally found in the user’s manual.
Customized adjustment of the C5/9 Controller to individual power amplifiers
If the C5/9 Controller should be customized to the particular amplifiers with which it will
be used, please contact KLING & FREITAG GmbH. We would be happy to adjust the
C5/9 Controller to meet your individual needs. In doing so, it would generally no longer
be necessary for the owner to make further adjustments on the power amplifiers when
using the standard configuration 1 x T5 or T9 and 2 x B5.