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GENERAL DESCRIPTION
USER MANUAL LOAD1_80
DATE: 30/08/00 12:48
Balanced Audio Output
The analogue outputs are on 3-pin male XLR connectors with positive and negative signal
polarities on pins 2 and 3 respectively. Pin 1 is coupled at high frequencies to the chassis using a
capacitor to limit screen currents, and to the analogue ground with a jumper link. The output will
deliver a full-scale output of +28dBu(balanced 600Ω / 1nF load.)
During A/C power up of the NX241, all outputs are muted by firmware-controlled relays (strapping
pin 2 and pin 3 of each output).
Connecting the audio outputs
Output stages are able to drive several amplifiers in parallel; however it is not advised to work with
loads of less than 600 Ohm. It is best to check with the impedance characteristics of the inputs -
supplied by the manufacturer - to check if the number of amplifier channels is acceptable. Where
precise information is not available (and taking 5 kΩ as the minimum expected value) then seven
channels in parallel per output is a conservative maximum. In the case where input impedance is
20kΩ it puts this value up to 30 amps channels
General Functions
System Protections
The following protection functions are performed. See "Protection Information Notes" page 20 for a
complete description. As the NX241 TDcontroller is common to all NEXO cabinets, see also the
release notes corresponding to each software revision for an update of the following list.
n Temperature Protection
n Displacement protection
n Peak limiting
n Interchannel regulation
n Physiologic Dynamic Control
Sense lines
Recommendations for sense line wiring
The Input impedance of the TDcontroller’s Sense inputs is very high, current is thus very low
although voltages are high. It is therefore not necessary to use a special type of cable. If the
processor is placed in the amp rack an unshielded cable can be used.
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