VideoEase MonoPro XLR Application Guide
© MuxLab Inc. 2005-2006
6
Use In Conjunction With Analog Audio Balun (500019)
The MonoPro XLR also works in conjunction with the 500025 at the source and the 500019 at
the receiver. For example, in a building paging system, there may be a central audio distribution
amplifier with pro-audio balanced (XLR) outputs that needs to connect to remote audio
amplifiers with line-level (RCA) inputs in another location via Cat5 cable.
However, it is important to note that the nominal professional audio signal is +4dBu and that
unbalanced line level audio is typically -10dBu. For example, if one connects the 500025 to the
500019 via 10 feet of Cat5, the signal level will be too high.
The risks are:
a)
the signal may be distorted (s/n ratio)
b)
there will be poor frequency response or
c)
there may be possible damage to the receiver.
In order to ensure reliable operation, the following precautions should be taken:
a) Ensure straight-through polarity between the 500025 and 500019.
b) Ensure that the signal level at the XLR output is not too high and corresponds to -10dBu at
the receiver either by calculating the signal loss due to the cable and/or adjusting the volume
controls.
