User's Manual
LINE 212-6 / LINE 212-9
KLING & FREITAG GMBH ©2003 - 2005
Version 4.1, 23.03.2006
Seite 19 von 37
9.
Operations with the K&F C2 Controller
The use of carefully adjusted filters (EQ) on the system plug-in cards enables the C2
Controller to optimise the feedback stability and the frequency response of the Line
212 System. We do not recommend operations without the C2 Controller.
Operating safety and maximum performance of the LINE 212 System can only be guar-
anteed when used with the C2 Controller. We cannot offer a guarantee for overload
damage resulting from use with a controller aside from the C2. As a rule, the Line 212
systems should only be operated with a system equalisation (filter). If, despite this risk,
the LINE 212 system should be run with another controller, we will send further instruc-
tions upon request.
The C2 Controller optimises the operating safety of speakers and power amplifiers
through special peak and RMS limiters with sense technology:
With other (universal) controllers, the gain of the selected power amplifiers must be
known. The limiter on the C2 Controller, on the other hand, uses a special control
circuit to determine the actual output voltage of the power amplifiers. The limiter
then reduces the input level only when the power amplifier actually provides more
power than the speakers can handle. The amplifier's gain and the position of the
input level control for the power amplifiers are insignificant for the limiter function of
the C2 Controller.
C2-
Power amplifier with
Controller
input level control
Limiter
Measured value
(Output voltage of
the power amplifier)
Universal
Power amplifier with
Controller
input level control
Limiter
Fixed value, depending on the gain and the position of
input level controls of the power amplifier.
Important
