KLING & FREITAG K&F Line 212-9 - SP - Manual (Page 11)

User’s Manual LINE 212-6 - SP / LINE 212-9 - SP
KLING & FREITAG GMBH ©2003 - 2014 Version 5.0, 09.09.2014 Page 11 of 44
5) FILTERS ON / OFF (High Pass / Low Pass / Equalizer)
This switch turns the filter in the SP module on (‘ON’), or off (‘OFF’).
a) The switch should always be in the ‘ON’ position when the speakers are being
driven without K&F System Controller.
b) The switch should always be in the ‘OFF’ position when the speakers are being
driven with K&F System Controller.
The filters consist of:
− high-pass: protects the speakers against mechanical stress due to frequen-
cies outside the speaker's frequency range (protection against subsonic
frequencies)
− EQ: filter for basic equalization, optimising the frequency response of the
speaker systems.
Furthermore, the SP filter module has a phase alignment, which prevents loss
of certain frequencies due to phase shift between mid-high and bass systems.
Thus the combination of all available K&F mid-high SP systems with all K&F
bass SP systems is possible, and 100% phase compatibility with all K&F speak-
ers operating in conjunction with a K&F System Controller in the ‘2-way active’
mode is guaranteed.
6) LED POWER ON (GREEN) and LIMIT / PROTECT (RED)
The LED is dual-purpose:
a) When the LED is green, the speaker is connected to the supply voltage and
ready for operation
b) The LED will turn red if…
…the input signal is so high that the internal limiters reduce its level.
The limiters consist of a peak limiter, which limits the peaks of the signal,
and an RMS / thermal limiter, which continuously regulates excessive levels.
During normal operation, the red light may occasionally illuminate briefly
when the barely audible limiter cuts in to limit peak levels. It does indicate
that the level peaks are limited by the limiter circuit. The peak performance
of the speaker has then been reached.
Should the red light come on more frequently or remain illuminated, the
output level of the mixer should be reduced. When speakers with and
without SP module are in operation simultaneously, the gain control on the
SP speaker can be turned down, provided the level is sufficient for the oth-
er power amplifiers. The limiter protects the speaker from damage due to
excessive levels.