Input Signal Chain (Line Level Devices); Output Signal Chain - Extron electronics MediaPort 200 User Manual

Input Signal Chain (Line Level Devices)

The default input gain setting is 0 dB. For devices with a line level output, a setting of 0
dB may work for a balanced, pro line level output of +4 dBu, while an input gain setting of
+11.8 dB will bring an unbalanced, consumer level output of −10 dBV up to pro (+4 dBu)
line level. Some additional adjustment may be necessary, depending on other settings on
the device.

Output Signal Chain

Gain
All output gain controls are set to 0 dB, or "unity gain." For outputs 1 and 2, connected to
a sound system, input sensitivity should be set on the receiving amplifier such that clipping
on the amp does not occur. Many amplifiers have an input sensitivity of +4 dBu; therefore,
a setting of –17 dBu works well. Often, the 12:00 position on the amplifier input knob is
close to this setting, and will work well while providing an easily repeatable position for input
sensitivity.
For output 3, no adjustment should be necessary for the input to the MediaPort Mic/Line
In. The unity gain setting should work well for output 4, though an input gain setting may be
necessary on the hardware video codec.
Limiter
A limiter is placed on the output signal chain to prevent clipping and protect connected
devices. The threshold for the limiter is set to –3 dBFS. If the output signal stays at the
–3 dBFS point for extended periods of time, you might hear the limiting of the dynamic
range of the signal. In this case, you may want to lower the output gain control by 5 dB.
MediaPort 200 Audio Application Tutorial • Configurations for DMP 128 31