Mains Section; Analog Input Card - Klein + Hummel 0810 Bedienungsanleitung

Mains Section

The power On/Off switch turns the mains power completely on and off. The applied mains power voltage should
be within -15% and +10% of the selected value. The internal mains fuse value depends on the mains voltage and
is specified on the electronics panel.
The voltage selector switch selects between 220/240 V, and 100/120 V. Set this to the correct value BEFORE
applying mains power to the subwoofer. The internal mains fuse is a suitable value for both voltage settings.
The 12 V trigger is used to turn the subwoofer on and off remotely without having the use the mains power
switch. This may be useful in a large facility where the whole room is powered-up using a single switch.
Equipment can be time-delayed using simple low-voltage circuitry so there is not a mains power surge. Note that
subwoofer's electronics are fully powered on and off with this control, so the startup time is subject to the same
on/off anti-popping muting delays as if the subwoofer had been turned off and on using the main power switch.
To activate the 12V remote power mode:
• Turn off the subwoofer and disconnect the mains power and signal cables.
• Open the electronics panel (located in the cabinet or remote electronics kit).
• Locate the large switch on the mains power circuit board and move the switch towards the large black
capacitor.
• Close the electronics panel and reattach the mains power and signal cables.
• Power up the subwoofer, apply 12V to the remote control terminals, and check that the appropriate lights are
illuminated.

Analog Input Card

The analog input stages are all 13 kΩ electronically balanced types on female XLR sockets. An input ground lift
switch disconnects pin 1 of all eight input audio grounds from the internal signal ground (note that pin 1 of all
eight input connectors remain connected to each other for both positions of the ground lift switch).
If there is a humming or buzzing sound coming from the subwoofer(s) or loudspeakers in the system, first check
it is not the subwoofer(s) or loudspeakers by disconnection the input and output signal cables. If the noise goes
away it is not the subwoofer(s) or loudspeakers, so the noises must be coming from the source or source cabling.
There are various ways to increase the loudspeaker's immunity from these external noises:
• Use the input ground lift switch on the subwoofer(s) and/or loudspeakers to disconnect the audio ground
from the electronics' chassis ground. For safety reasons, the electronics' chassis ground is always connected to
the mains power earth pin.
• Use loudspeakers fitted with a transformer balanced input stage. This is especially effective when combined
with the ground lift switch. This is not an option on these subwoofers.
Operating Manual O 810 / O 870
Pin Signal
1 Audio Ground
2 Positive
3 Negative
English
Klein + Hummel
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