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User's Manual K&F Self Powered Subwoofer Systems 'SP'
KLING & FREITAG GMBH ©2003 - 2005 Page 23 of 49
8.3 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. If no manufacturer’s recom-
mendations 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