KLING & FREITAG K&F E 90 MK II - Manual (Page 15)

User’s Manual E 90 MK II
KLING & FREITAG GMBH ©1995 - 2006 Version 4.0, 02.11.2006 Page 15 of 22
9. Operating the Speakers
− Switch off all equipment and turn down all level controls.
− Wire the E 90 MK II systems according to the wiring diagrams as shown be-
fore.
− Upon completing the wiring, ensure that the connected speaker channels are
working in phase. To do so, use i.e. a phase checker. A phase error can also
be recognized when the connected channels are used simultaneously. During
simultaneous use the bass frequencies become notably quieter or the mid-
frequencies such as voices cannot be located.
− Now switch on the peripheral equipment first (mixing console, effects etc.),
followed by the power amplifiers. Always use the before mentioned switching
order. Otherwise switching noises may damage the system.
− If there is interference, turn off all appliances in the reverse order and check all
cable connections (see chapter 7.2 ).
− Now put a low level signal into the system and check for the correct function
of the system. In doing so, all amplifier input controls need to be turned off
again. Now turn on the control for the left E 90 MK II system and check that
the correct signal is coming out of the E 90 MK II system.
− Your system should now be ready for operation.
− Turning down the input level controls may not always prevent distortions in
the input section of the power amplifier, especially if this section has a rela-
tively low headroom. A clipping signal may not be displayed by the clipping
indicator then. To prevent signal interruptions or damages to the speakers,
turn the level controls of the power amplifier to the maximum position, if pos-
sible. The output level of the mixing console or the controller should be set to
a level that doesn't overload the power amplifiers.
− When turning off the system, the input controls for the power amplifiers
should be turned down first followed by the power switches of the amplifiers.
After that, the other appliances can be turned off.
− The crossovers of the E 90 MK II systems are equipped with protection circuits
for the 1’’ and 5’’ drivers. These circuits cut off the signal current when highly
overloaded. If the high speaker turns off, reduce the volume. After a few sec-
onds, it will turn back on automatically.
Important