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Volume Control
One of the biggest problems in multichannel monitoring is controlling the replay level of the monitoring system.
When there is volume control available at source, the mixing console or surround sound processor controls the
level of the all the output signals from the device. The Volume Control switch should be set to "Disable" so that
the gain through the bass manager is fixed to 0 dB for all channels.
When volume control is not available at the source, it can be performed in the 7.1 High Definition Bass Manager™.
This is typical, for example, when stereo consoles are being used for multichannel work, or when CD players or
(processed) outputs from DVD players are directly connected to the subwoofer. In these cases, the Volume
Control switch should NOT be set to "Disable", i.e. to the left. The system volume can then be controlled using a
remote controller (the SRC 1 or SRC 2 from K+H), or by using RS-232 codes from an automation system, for
example Crestron or AMX (a protocol for this can be found at www.klein-hummel.com).
The VOL stages are located at the main channel outputs of the 7.1 High Definition Bass Manager™ and the
subwoofer output. As a result they can be used for controlling the replay level of the entire system or for
remotely trimming individual loudspeaker levels. Consequently, they cannot be used to replicate signal SOLO or
SELECT type functions as seen in mixing consoles. However, it is possible to MUTE and SOLO one or more of the
loudspeaker outputs. This is useful when setting up the system – play some bassy material at high levels with all
the main loudspeakers muted (subwoofer is soloed) to find the source of rattles in the listening room. Using
subwoofer mute and bass management together gives some useful additional functionality:
Bass Management
In order to maintain a high-quality signal path, there is no VOL stage on the SUM OUTPUT so daisy-chained
subwoofers must be individually controlled. The cables required for this depend on the source of the control data.
If the control equipment has RS-232 on D-sub connectors, an RS-232 to CAT-5 cable is required. Only pins 3, 4
and 5 should be connected. Pins 4 and 5 should be crossed over, i.e. TX connects to RX and vice versa.
If the control equipment has a USB connector, a USB to RS-232 Adapter is required – see Accessories and Options
section. It is not recommended to use commercially available adapter as, depending on the internal wiring,
damage is possible. Once the USB is converted to RS-232, an RS-232 to CAT-5 Adapter is required to connect to
the subwoofer – see Accessories and Options section.
For multiple subwoofer systems, an EtherCon Adapter (SEA 1) is required – see Accessories and Options section.
Four EtherCon sockets allow for simultaneous connection of a hardware remote control and an RS-232 source –
although simultaneous adjustment of the hardware remote should be avoided when sending data from the
RS-232 source. The last subwoofer in the daisy-chain is connected directed to the to previous subwoofer's
SEA 1 Sub Out socket. The connectors are for:
1. Hardware remote input (SRC 1 or SRC 2)
2. RS-232 input / Subwoofer daisy chain input
3. Subwoofer slave output (subwoofer 2, 3, ...)
4. Subwoofer output
Operating Manual O 810 / O 870
All manuals and user guides at all-guides.com
Subwoofer
ON
ON
ON
MUTED
DISABLE
ON
DISABLE
MUTED
RS-232 D-Sub to CAT-5 Adapter
Bass Extension (-3 dB)
18 Hz
80 Hz
Main Loudspeaker's LF Cut-off
Main Loudspeaker's LF Cut-off
English
Klein + Hummel
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