User’s Manual
‘SP’ Models based upon the CA Series
KLING & FREITAG GMBH ©2003 - 2006
Version 6.1, 19.06.2006
Page 25 of 54
9.3
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
=
50.000
Ω
50k
Ω
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