Optional Digital Input Card (Dim 4) - Klein + Hummel O 810 Bedienungsanleitung

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
with the ground lift switch. This is not an option on these subwoofers.
• If unbalanced source signal cables are used, they can be specially wired – see picture below. Disconnect the
cable screen from the RCA sleeve if there are still humming or buzzing sounds, and/or use the ground lift
switch on the loudspeaker. Always use balanced connections from the subwoofer to the main loudspeakers.
In addition, the 7 main channels are summed and the LFE input has a 0 / +10 dB gain stage. Finally, the test
signal is routed onto the left input for reproduction by the subwoofer and left loudspeaker (see Calibrating Phase
section).

Optional Digital Input Card (DIM 4)

Optional Digital Input Card (DIM 4)
Optional Digital Input Card (DIM 4) Optional Digital Input Card (DIM 4)
The DIM 4 is an optional card with four 24-bit, 192 kHz digital input stages that can accept AES3-2003
(commonly known as AES/EBU), AES3id-2001, and S/P-DIF (with a suitable connector converter) signals 4 x XLR
and 4 x BNC connectors ensure good interconnectivity options, however only one of the sockets of an input stage
should be used at a time. The DIM 4 card converts up 4 digital audio signals into 8 channels of analog audio,
which are then routed to the channel summers and high pass filters, or the LFE routing and gain stage. Generally
the channel ordering will be as shown in the table below. With the exception of the LFE channel, the seven main
channels may be used for any broadband signal, however the output channel ordering will depend on the input
signal order.
* The LFE channel must be placed on AES or BNC input socket 2, subframe B to have access to the appropriate LFE
processing facilities.
Uncompressed PCM AES3, AES3id, and S/P-DIF digital signals generally contain two audio channels (called
"subframe A" and "subframe B") on one cable (single-wire mode). A clock input is not required because
loudspeakers are not audio sources and the clock signal is locally regenerated from data contained in the bit
stream. Always use good quality cables with the correct impedance and appropriate termination to achieve these
maximum cable lengths:
O 810 / O 870 Operating Manual
Downloaded from www.Manualslib.com
transformer balanced input stage. This is especially effective when combined transformer balanced input stage transformer balanced input stage
Source (RCA)
Unbalanced RCA to Balanced XLR Connections
Signal cable for unbalanced sources Signal cable for unbalanced sources
Signal cable for unbalanced sources Signal cable for unbalanced sources
Input Stage Input Stage
Input Stage Input Stage
1
2
3
4
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Pin Pin Pin Pin Signal Signal Signal Signal
1 Audio Ground
2 Positive
3 Negative
Loudspeaker
(XLR-M)
2
Subframe A Subframe A Subframe B Subframe B
Subframe A Subframe A Subframe B Subframe B
Left Right
Center LFE *
Surround Left Surround Right
Back Left Back Right
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