Crossover - KLEIN+HUMMEL O 410 Mode D'emploi

The 12 V trigger is used to turn the loudspeaker 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, although
there is already the soft start function to reduce this effect. Note that loudspeaker's electronics are fully powered
on and off with this control, so the startup time is subject to the same on/off muting delays as if the loudspeaker
had been turned off and on using the main power switch. There are two modes of operation, which are selected
using an internal switch (see picture below):
Remote Power Mode Switch Position
"12 V TURNS OFF" Away from backplate
"12 V TURNS ON" Towards backplate
The factory default mode setting is "12 V TURNS OFF". In both modes and with either applied voltage levels at
the terminals, switching the mains power switch to "OFF" will turn off the loudspeaker.
To change the remote power mode to "12V TURNS ON":
•
Turn off the loudspeaker 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 backplate.
•
Close the electronics panel and reattach the mains power and signal cables.
•
Power up the loudspeaker, apply 12V to the remote control terminals, and check that the appropriate lights
are illuminated.

Crossover

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Using 4 order filters, the crossover divides the input signal into three bands for reproduction by the appropriate
sized driver. Time alignment ensures that the sound from each driver around the crossover frequencies is emitted
at the same time. In addition to this an extensive protection system ensures that the loudspeaker is not
damaged if a large signal is applied to the input. The red "PROTECT" lights up when the protection system is
active. If this happens, reduce the input signal. If this happens regularly, use a larger loudspeaker with a higher
SPL output, or add a subwoofer to handle the high-level low-frequency energy. The protection system consists of:
thermal and peak limiters for the amplifiers, thermal modeling of the drivers, and an excursion limiter for the
drivers.
The protection system is not a compressor, it is designed to protect the loudspeaker from damage, and the red
light tells the user it is active. The protection cannot protect against sustained abuse of the loudspeaker, i.e.
consistently playing the loudspeaker for long periods of time with the protect light on, so avoid this to ensure a
long life from this product.
There are also production trimmers in the crossover section which are hidden from view to avoid "accidental"
adjustment. These should only be adjusted by qualified personnel with specialized measurement equipment.
If a component critical for sound quality, e.g. bass driver, is changed, the loudspeaker should ideally be
recalibrated in a Klein + Hummel Continental Service Center, i.e. one equipped with an anechoic chamber.
Operating Manual O 410
Function
Applying 12 V across the remote terminals turns OFF the loudspeaker
Removing the 12 V from the remote terminals turns ON the loudspeaker
Applying 12 V across the remote terminals turns ON the loudspeaker
Removing the 12 V from the remote terminals turns OFF the loudspeaker
English
Klein + Hummel
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