Prism Sound ADA-8XR Multi-channel A/D D/A Converter Module Reference - Revision 1.01
© Prism Media Products Limited, 2001-2005
Page 3.13
4 Analogue Line Output Module PREV039/5/1
4.1 Overview
The Analogue Line Output Module type PREV039/5/1 provides eight electronically-balanced
analogue output channels from the ADA-8XR, on eight male XLR connectors.
Output line-up level (gain) is variable for each channel over the range 0dBFS=+5.0dBu to
0dBFS=+24.0dBu, in 0.5dBu steps plus a fine trim.
Control of the output line-up level and trim is via menus which are present in the ADA-8XR
Menu System if the Module is present.
4.2 Fitting the Module
In most cases, the Module has been factory-fitted so, unless you are fitting the module
yourself, the remainder of this section may be ignored.
The Analogue Line Output Module can be fitted to either Analogue I/O Slot (AIO1 or AIO2) in
the rear of the ADA-8XR (as shown in the Layout section of the Operation Manual). Although
the ADA-8XR can automatically accommodate the module in either position, it is conventional
that analogue output modules are fitted in the lower slot (AIO2) and line input modules in the
upper slot (AIO1). This will provide compatibility with operating examples quoted in these
manuals. An exception is the case of ADA-8XRs configured for 16-channel A/D or D/A
operation, where BOTH AIO slots would contain either line input or line output modules
respectively.
For details of how to fit the Module, refer to the Adjustments and Upgrades section of the
Operation Manual.
4.3 Connection
Connection to a balanced load is straightforward with conventional XLR pinouts: hot (+) on pin
2, cold (-) on pin 3, with pin 1 connected to the cable screen.
An unbalanced load should be connected between pins 2 (+) and 3 (-) of the output XLR. Pin
1 may be connected to pin 3 to ground reference the cold leg if required, and will often give
better results, depending on the topology of the load circuit. Note that in this mode, line-up
levels above 0dBFS=+20dBFS should not be used since the bootstrapping action of the
output circuit may cause clipping.
It is possible to connect unbalanced loads across pins 2 (+) and 1 (gnd) of the output XLR,
albeit with a gain loss of 6dB. This method is not recommended since it may cause increased
distortion.
4.4 Module Dependent Output Options Menus
When an Analogue Line Output Module is assigned as an output Port from a Path, two menus
become available for the appropriate Module Slot in the Module Dependent Output Options
section of the Menu System for that Path. These menus can be reached either using Menu
System navigation keys, or more easily by pressing the blue ‘Access’ button in the ‘Dest’ box
of the Mimic panel when it is selected to the desired Path.
