QuickMedia™ Matrix Switcher/Mixer
Crestron
QM-MD7x2
information on using Digital Media Tools software, refer to the extensive help
information provided with the software.
NOTE:
The input gain is independent of the system’s output volume level.
1. To adjust the input gain, set the gain and noise gate for microphone 1 to
their lowest settings. Disable the “Mute” function by removing the
check from the
Mute
checkbox.
2. Connect a microphone and enable phantom power if required.
3. Increase the gain for microphone 1 while providing a “normal” sound
level input to the microphone. When the “Norm” indicator shows fairly
consistent activity, you’ve reached a good signal level for the local
microphone input.
NOTE:
The "clip" indicator shows that the signal is clipping. Let your ears be the
judge, but when the clip indicator is active, you are approaching or have reached
distortion in local microphone signal. Occasional clip indications on loud input are
expected, but constant clip indicator activity is a sign that the gain may be set too
high.
4. Set the system output volume to a desirable listening level and verify
the gain settings by listening to the system output. Some minor gain
adjustment may be required for the “best sound” in any specific
configuration.
5. Repeat for the second microphone input.
Setting the Gating Level
The MD7x2 provides an input level gating function that will mute the local
microphone signal when the input sound level is below a user-set threshold. This
function can be enabled or disabled via software commands.
Use the Realtime Mode in Digital Media Tools to control phantom power, gain and
gate settings, and to monitor the gate, normal, and clip level indicators. For
information on using Digital Media Tools software, refer to the extensive help
information provided with the software.
The following procedure sets the optimal “gate level” for the microphone inputs:
1. Follow the “Setting Microphone Gain” procedure on page 75 to set the
gain for each microphone input.
2. Set the noise gate level, attack and decay times to minimum. Disable
the “Mute” function by removing the check from the
Mute
checkbox.
3. While providing a level to the microphone that is equivalent to the
background noise that should be gated out, increase the noise gate level
for microphone 1 until the
Gated
indicator turns off. When the input
sound levels are at or below the established noise gate level, the
microphone output signal will be gated off. Repeat for the second
microphone input.
4. Set the “attack time” to the minimum level and the “decay time” to the
maximum level. These settings provide the shortest time to enable the
microphone output when an input is above the gating level, and the
longest time before disabling the microphone after such an input.
76
•
QuickMedia™ Matrix Switcher/Mixer: QM-MD7x2
Operations Guide - DOC. 6273
