epiphan Pearl Mini, User Manual

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Pearl Mini User Guide Selecting an audio source
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Admin Panel : On the audio input source's configuration page when you select the input source from
the Inputs menu. You can also add the VU meter to appear on the video output ports, see Disable or
enable audio and output port volume .
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Epiphan Live : See Monitor video and audio input sources
Selecting an audio source
The audio that's coming from the connected HDMI video sources (HDMI-A and HDMI-B) is automatically used
as the default audio source for the HDMI-A and HDMI-B channels on Pearl Mini. You can choose different
audio sources for a channel using the Admin panel and do things like adjust the input gain, see
Adjust audio
gain and delay .
Select your audio sources from connected video sources (SDI, HDMI, USB video UVC, and RTSP), as well as
from the dedicated analog audio input ports. The USB (UVC/UAC) ports on the rear panel of Pearl Mini will
accept a USB microphone (UAC).
Dedicated analog audio inputs ports are:
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Two XLR/TRS combo jacks.
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XLR mic-level input (balanced), supports 48 V phantom power
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TRS ¼" professional line-level input, + 4.0 dBu up to 12.3 V RMS, (+24 dBu)
(balanced/unbalanced)
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One 3.5 mm stereo mic level input for electret microphones (unbalanced)
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One stereo pair RCA consumer line-level input (-10 dBV)
The XLR and TRS combo jacks are configured as a left/right stereo pair by default, see Configure audio ports
for stereo or mono . The 3.5 mm audio ports and the RCA audio ports are linked. You can configure Pearl Mini
to use both or just one of the audio sources using the Admin panel, see Assign audio sources to an input .
This table offers some guidelines for adjusting the gain of the audio input ports for common types of audio
devices. You should add the suggested gain to the audio input to get an average signal to register at a nominal
level in the VU meter (i.e. where the green bars change to yellow). The actual amount of gain needed depends
on the strength of the original audio signal.
Table 4 Audio gain guidelines for different audio devices
Audio source
Input
port
Gain
Dynamic microphone XLR Add +50 to +60 dB gain to the audio input port.
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