2 operating the systems with k&f system controller, 3 maximum configuration – KLING & FREITAG K&F Line 212-9 - SP User Manual
Page 27
User’s Manual
LINE 212-6 - SP / LINE 212-9 - SP
KLING & FREITAG GMBH ©2003 - 2014
Version 5.0, 09.09.2014
Page 27 of 44
11.2 Operating the Systems with K&F System Controller
For optimal performance with an extended functional range we recommend using a
K&F system controller. Instructions for use, connecting diagrams and detailed descrip-
tions of the latest controller models ‘CD 24’ and ‘CD 44’ you can find in the corre-
sponding user’s manuals.
11.3 Maximum Configuration
It is possible to use a large number of SP speakers in parallel simultaneously, however,
this number is limited according to the permitted minimum load impedance of the sig-
nal source (e.g. mixer, equalizer, etc.).
The total input impedance of all SP speakers must be larger than the permitted mini-
mum load impedance of the signal source. If no manufacturer’s recommendations can
be found, take the output impedance of the signal source. In this case, we recommend
a total input impedance at least 10 times higher than the stated output impedance of
the signal source.
(The output impedance of your signal source can normally be found under ‘Technical
Specifications’ in the manufacturer’s instruction manual).
Definition:
source
signal
of
impedance
output
R
OUT
=
50.000Ω
50kΩ
speaker
-
SP
impedance
input
R
IN
=
=
=
speakers
SP
of
number
d
recommende
maximum
n
MAX
=
The maximum number of SP speakers can be calculated with this formula:
10
50
10
n
MAX.
×
Ω
=
×
<
OUT
OUT
IN
R
k
R
R
Example:
Ω
= 75
OUT
R
10
75
000
.
50
10
n
MAX.
x
R
R
OUT
IN
Ω
Ω
=
×
<
66
n
MAX.
<
⇒
Important