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output bridge
B411 to
100 V B407
70 V B408
50 V B409
4 ohms B410
table 1 bridge B411 settings figure 5 coding-bridges S405 / S406 settings
switching the output voltage output recognition OUTPUT CONFIG
Caution It is possible that during operation shock-hazard output voltages can be present at the POWER
OUTPUT connector (>34V peak value). Thus, the connected loudspeakers have to be installed in
accordance to applicable security standards and regulations (see also paragraph 8.5.2).
8. Enhanced application field
8.1 Standard input module NRS 90225
This input module for the power amplifiers DPA 4120 and DPA 4140 is meant for insertion at the power amplifiers'
rear. It provides the following functions:
• lockable XLR input connector
• XLR output connector; to patch the input signal through
• gain control; to be adjusted using a screwdriver
• mains remote ON/OFF
• battery remote ON/OFF
• control of the D- and E-relays
• fault messages via the READY relay contact:
- thermal overload of the mains transformer
- thermal overload of the power amplification stage
- ground fault (optional; only with installed NRS 90224)
- pilot tone signal (optional; only with installed NRS 90224)
• MONITOR output; electronically balanced
• input transformer for floating, balanced input; optional
• output transformer for floating, balanced monitor output; optional
The input module is meant to be used with the power amplifiers DPA 4120 and DPA 4140. The module allows to
control and monitor the operation of the power amplifiers using conventional equipment or (with reservations) by the
PROMATRIX manager DPM 4000.
Caution: Before installing the input module NRS 90225, you have to unplug the mains connector as well as a
presumably connected battery cord.
Before installing the input module, it is necessary to remove the two locking screws B on the rear panel of the
appliance. For installation the printed board assembly first has to be inserted into the guiding rails. After carefully
pushing the module in it has to be locked by using the two screws mentioned before.