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CHAPTER 3: MDM-832 FRONT AND REAR PANELS
Routing Two Inputs to Four Outputs Each
To route two inputs to four channel outputs each:
■
Set the Link 4 switch to OFF and all other Link switches
to ON.
Link 1
Link 2
Link 3
On
On
On
Out 1
Out 2
Out 3
In 1
In 1
In 2
In 2
In 3
In 3
Routing Eight Inputs to Eight Separate Outputs
To route eight inputs to eight separate channel outputs:
■
Set all Link switches to OFF.
Link 1
Link 2
Link 3
Off
Off
Off
Out 1
Out 2
Out 3
In 1
In 1
In 2
In 2
In 3
In 3
Input Impedance for Linked Channel Inputs
When a Link switch is enabled, the channel input's unbuff-
ered source signal is transmitted in parallel to each linked
channel output. This causes the channel input's impedance
(normally 10 kOhms for one loudspeaker) to be reduced for
each linked output. For example:
■
1 channel output, 10 kOhms input impedance
14
Link 4
Link 5
Link 6
Off
On
On
Out 4
Out 5
Out 6
Out 7
In 4
In 4
In 5
In 5
In 6
In 6
In 7
In 7
Link 4
Link 5
Link 6
Off
Off
Off
Out 4
Out 5
Out 6
Out 7
In 4
In 4
In 5
In 5
In 6
In 6
In 7
In 7
■
2 channel outputs, 5 kOhms input impedance
■
4 channel outputs, 2500 ohms input impedance
■
8 channel outputs, 1250 ohms input impedance
To avoid distortion when linking channel inputs, make sure
the source device can drive the total load impedance of the
Link 7
linked loudspeakers. The audio source must be capable of
On
producing +20 dBV (10 V rms, 14 V peak) into 600 ohms to
produce the maximum peak SPL over the operating band-
width of the connected loudspeaker.
Out 8
NOTE:
driving loads no smaller than 10 times their
output impedance. To drive eight loudspeakers linked
from a single channel input, the source device should
have an output impedance of approximately
100 ohms or less.
In 8
In 8
RMS Network Connectors
The RMS section of the user panel includes two network
connectors and a Terminator switch.
Link 7
Rear-Panel RMS Network Connectors
Off
The rear-panel Weidmuller 2-conductor, locking connectors
transfer data to and from the RMS network by providing a
connection between the distribution module and RMServer,
Out 8
and can be used to extend the RMS network to additional
distribution modules. Included with each MDM-832 are
Weidmuller cable connectors and mounting blocks for con-
structing RMS cables. The RMS blocks allow cables to be
securely attached to the RMS module with screws.
In 8
In 8
RMS Terminator Switch
The Terminator switch engages an internal resistive, capaci-
tive circuit designed to prevent electrical reflections in the
RMS network. If the RMServer is receiving poor data or
experiencing other communications problems with the RMS
network, switching the Terminator switch to the ON position
may help increase network stability.
Most source devices are capable of
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