KLING & FREITAG K&F CD 44 Digital System controller - Manual (Page 66)

User's manual K&F CD 44 Digital System Controller
KLING & FREITAG GMBH © 2014 Version 11.6 Page 66 of 77
11. Recommendations for Configuration
11.1 Operating several Speakers per CD 44 Channel
The maximum number of speakers which can be operated at one time using the CD 44
Controller is limited by the minimum output impedance of the power amplifiers.
Make sure the power amplifier has sufficient headroom.
No further adjustments need to be made to the CD 44 Controller when operating with
several speakers connected to a single controller. There is no need to adjust the limiters. They
receive the necessary information via the voltage applied (not via the current).
SP speakers: Up to 50 SP speakers can be connected to one channel.
11.2 The correct Level Balance between Subwoofer and Top
Speakers
When setting up the system it is very important to ensure that the volume levels of the tops
and subwoofer are correctly balanced.
The sound level of arrayed bass speakers increases by max. +6dB when doubling the number
of speakers (+3dB efficiency plus 3dB by doubling the power amplifier level). The loudness of
the tops increases in a different manner because of the directivity.
Furthermore, because of missing floor reflections, a flown subwoofer can be several decibels
quieter than a subwoofer which is standing on the floor.
With the CD 44, you can adjust this level balance to meet the requirements of different con-
figurations and applications.
In order to intuitively set the output gain, it is important to remember that the output gain
must always be set at 0 dB for the following speaker combinations (applies to systems placed
on the floor):
• 1 small top and a subwoofer with one chassis
• 1 large top and a subwoofer with two chassis
• ACCESS top T5 or T9 with 2 x ACCESS B5 or 2 x ACCESS B10
CA 106 and CA 1001 are regarded as small tops. All other tops with available LS-Block, except
the ACCESS, are considered to be large top.
The following tables show how this relationship is to be set for the particular configurations.
In doing so, it also considers if the systems are flown or placed on the floor.
The data given apply to subwoofer placed on the floor and are valid on the condition that
all systems are driven by identical power amplifiers with the signals set at the same level. We
recommend maximum level).
When using power amplifiers with different gain characteristics it can become necessary to
adjust the balance between top and subwoofer using the output gain control of the CD 44.
Depending upon room acoustics and geometry the correct settings may well differ in practice
from that given here. For this reason the sound engineer should always carry out a fine
adjustment.
11.2.1 SW 112 / SW 115D / SW 115E / SW 118E
Prerequisite:
• identical power amplifiers for tops and subwoofers with identical volume settings.
• subwoofers placed on the floor.
1 Subwoofer with 1 Top