EasyUSB AudioBRIDGE
Easy USB AudioBRIDGE - Document Number 342-0769 Rev B Page 7 of 16
Mixing Modes
The EasyUSB AudioBRIDGE supports a single mixing mode. The Unbalanced & Balanced Line Inputs will be
automatically summed and sent to the USB TX (Recording) channel on the PC. The USB RX (Playback) channel
from the PC will be routed to both the unbalanced and balanced line outputs of the AudioBRIDGE.
Table: AudioBRIDGE Routing Table
Matrix Mixer USB TX (Recording) Balanced Line Output Unbalanced Line Output
Balanced Line Input X Not Available Not Available
Unbalanced Line Input X Not Available Not Available
USB RX (Playback) Not Available X X
“X”- represents an internal cross-point within the matrix.
Advanced Audio Operational Functions
HID Volume Lock (Dip Switch 1): The HID Volume Lock function can be used in applications where it is
desirable that the PC does not change analog gain settings on the AudioBRIDGE. When in locked mode, the
gain structures between the AudioBRIDGE and the connected AV equipment (Room DSP) cannot be modified by
the Host PC. This can be desirable to maintain constant cross-point levels on a room’s mixer that is combining
multiple audio sources preventing the USB audio levels over-riding other sources in the mix.
USB Terminal Type (Dip Switch 2): The USB Terminal Type is useful for deployments using Microsoft Lync.
Microsoft Lync uses the terminal type to automatically enable or disable the software acoustical echo
cancellation. There recommended settings for Terminal Type are:
Type 405: Set AudioBRIDGE to Type 405 if the connected professional audio equipment has built in echo
cancellation. Microsoft Lync will disable its internal echo cancellation. This typically will yield better audio
performance in terms of duplex operation.
Type 403: Set AudioBRIDGE to Type 403 if the connected professional audio equipment does not have
built-in echo cancellation. Microsoft Lync will enable its internal echo cancellation. Note that Microsoft Lync
is a single echo canceler. Summing multiple microphones into the software based echo canceler can yield
poor performance depending upon acoustical characteristics of the room.
Input Attenuation (Dip Switch 3): Enabling (up) dip switch 3 will automatically apply 6dB attenuation to the
audio mix being sent the USB TX (Record) channel. Note that the AudioBRIDGE will sum the Unbalanced Line
Input and the Balanced Line Input. If both inputs are active in the application, enabling the 6dB attenuation will
provide a higher dynamic range.
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