Prism Sound ADA-8XR Multi-channel A/D D/A Converter Module Reference - Revision 1.01
© Prism Media Products Limited, 2001-2005
Page 3.9
3 Analogue Line Input Module PREV039/4/2
3.1 Overview
The Analogue Line Input Module type PREV039/4/2 provides eight electronically-balanced
analogue input channels to the ADA-8XR, on eight female XLR connectors.
Input line-up level (sensitivity) is variable for each channel over the range 0dBFS=+5.0dBu to
0dBFS=+24.0dBu, in 0.5dBu steps plus a fine trim.
Each channel has a Prism Sound Overkiller progressive limiter capability, which prevents the
A/D converter from reaching full-scale, even when the input level significantly exceeds the
selected input range. More information about the Prism Sound Overkiller can be found in the
Technical Background section of the Operation Manual.
Control of the input line-up level and trim, and of the Overkillers, is via menus which are
present in the ADA-8XR Menu System if the Module is present.
3.2 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 Input 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 input modules are fitted in the upper slot (AIO1) and line output modules in the
lower slot (AIO2). 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.
3.3 Connection
Connection from a balanced source is straightforward with conventional XLR pinouts: hot (+)
on pin 2, cold (-) on pin 3, with pin 1 connected to the cable screen.
Unbalanced sources should still be connected to the ADA-8XR between pins 2 (+) and 3 (-) of
its input XLR, since the input circuit is balanced. Pin 1 may be commoned to pin 3 depending
on the topology of the driving circuit.
It is important not to connect an unbalanced source between pins 2 and 1 of the
ADA-8XR’s input XLR with pin 3 unconnected, since incorrect levels and/or excessive
interference may result.
