KLEIN+HUMMEL O 810 Mode D'emploi page 10

Output Card Output Card Output Card Output Card
The output card has seven channels of 4
channels. Following this, there are 7 x XLR electronic
sum) have protection to avoid power on/off noises: the outputs turn on after a short delay when mains power is
applied and mute instantaneously when the mains power is removed. The content of each output channel
depends on the content placed on each of analog inputs, or the optional digital input's two subframes (channels).
There is also 80 Hz high pass filtering and summing of the LFE channel to the left and right outputs (more details
of how this is used can be found in the Filter Card section).
Finally, there is a Sum Sum Sum output socket for connecting additional subwoofers into the system. There is no volume Sum
control on this output as volume control is performed locally in each subwoofer. As the output is a filtered sum of
the input channels, it should be connected to the LFE/Sum input on subsequent subwoofers in the system (see
example system diagrams in the System Use section). These should have their LFE mode switch set to "SUB ONLY
(WIDE)" so that double filtering is not applied. As the Sum output is always analog, subwoofers after the first
one in a daisy chain should not have the optional DIM 4 digital input card fitted.
Filter Card Filter Card
Filter Card Filter Card
The filter card contains bass management processing, subwoofer filtering, acoustical controls and a remote
control input socket:
The Power On Power On Power On Power On light (red) is illuminated when power is applied to the subwoofer, the mains power switch is on,
and the 12 V DC remote control are in a state to turn on the subwoofer. This light blinks during the power-up
phase of the internal microcontroller, and flashes if the protection system is activated. If the latter happens, turn
down the input signal, use a bigger subwoofer, or add additional subwoofer(s) to the system.
The Bass Management Bass Management Bass Management Bass Management light (green) is illuminated when bass management is on.
The Bass Management Bass Management switch turns on the bass management. This inserts a 4 Bass Management Bass Management
the signal path of each main channel output and routes content below 80 Hz to the subwoofer. Reproduction of
the LFE channel is unaffected by the setting of this bass management switch.
The Rear Channel Bass Management Rear Channel Bass Management switch define whether the rear channels (left surround, right surround, left
Rear Channel Bass Management Rear Channel Bass Management
back and right back) are included in the bass management processing. Some sound engineers prefer to bass
manage the rear channels, others do not. The use of this switch avoids having to unplug the XLR connectors for
these channels. Reproduction of the LFE channel is unaffected by the setting of this bass management switch.
The Volume Control Volume Control switch defines whether the remote volume control facility is activated or not. There is no
Volume Control Volume Control
attenuation of the input signals when the remote volume control is deactivated, so care should be taken when
adjusting this switch. If a remote control device (SRC 1, SRC 2, or RS-232) is disconnected from the subwoofer,
remote volume control is automatically disabled (gain through the bass management defaults to 0 dB).
The Signal Generator Signal Generator switch applies an 80 Hz sine wave signal to the left channel input (on the DIM 4 it is digital
Signal Generator Signal Generator
input 1, subframe A). This low frequency tone will be audible through the subwoofer and the loudspeaker
connected to the left output socket. It is used for setting the phase control (see Calibrating Phase section).
The Subwoofer Gain Subwoofer Gain Subwoofer Gain Subwoofer Gain, Subwoofer Phase Subwoofer Phase, Parametric Equalizer Subwoofer Phase Subwoofer Phase
Controls section below.
LFE channel reproduction depends on the LFE mode
by the setting of either of the bass management switches.
The LFE Gain LFE Gain switch applies 0 or +10 dB gain to the LFE channel. For Dolby Digital and DTS formats only, one 10 LFE Gain LFE Gain
dB boost is required in the monitoring system somewhere between the LFE channel fader on the mixing console
and the listener's ear. This boost can be performed in the monitoring matrix (console or external), in a decoder
output stage (surround sound processor or DVD/Blue-ray disk player), or in the 7.1 High Definition Bass
Management System™. Before using this switch, check that it has not been applied somewhere else in the signal
path. Too much LFE channel gain results in less LFE channel level in the mix, and vice versa.
O 810 / O 870 Operating Manual
All manuals and user guides at all-guides.com
th
order 80 Hz high pass filtering, and a volume control for each of these
7 x XLR electronic- - - - balanced output stages balanced output stages. All outputs (main channels and
7 x XLR electronic 7 x XLR electronic balanced output stages balanced output stages
Parametric Equalizer, and Low Cut Parametric Equalizer Parametric Equalizer
LFE mode settings (see LFE Mode description below) and is unaffected
LFE mode LFE mode
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order 80 Hz high pass filter into
Low Cut controls are described in the Acoustical Low Cut Low Cut
Klein + Hummel
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