Extron electronics MediaPort 200 User Manual page 21

Room Volume (Near End)
This master volume control is shown in red (see
mix-points it controls are also shown in red. This control is used to set the master volume or
"listening level" in the local, or "near" room.
When the MediaPort is used with an external DSP with AEC, the Line output is no longer
connected to a sound reinforcement system, but is instead connected to the DSP. In
this case, volume control is handled in the DSP. Since the
MediaPort is no longer be used for room volume, the
to the 0 dB setting, or unity gain, to achieve the best signal to noise ratio between the
MediaPort and the DSP.
Figure 8 and below shows the signal routing scheme for when the USB
A B
communications audio signal is sent to the Line output and Ref output, as well as when it is
just sent to the Ref output.
When the
Mix USB Communications
checked, USB communications audio is only sent to the Ref output and the Line output.
This setting is used when the Line output is connected to a sound system, and not to a
DSP.
When the
Mix USB Communications
routed to the Line output, and is sent only to the Ref output. This setting is used when the
Line output is connected to a DSP, and not to a sound system. This is so that program
audio and USB communications audio can be managed separately in the DSP. Alternatively,
this setting can also be used to send program and USB Communications audio to separate
sound systems.
A Mix USB Communications
Box Checked
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
Figure 8. Mix USB Communications Box Routing Options (Example)
figure 7 on the previous page) and the
Room Volume
Room Volume
in the box in the
Near End
box is unchecked, USB communications is not
B Mix USB Communications
Box Unchecked
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
MediaPort 200 • Theory of Operation
control in the
control should be set
panel of the tab is
Mix
14