Pearl Mini User Guide
Selecting an audio source for Pearl Mini
Selecting an audio source for Pearl Mini
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
Select your audio sources from connected video sources (SDI, HDMI, USB video UVC, SRT, 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:
l
Two XLR/TRS combo jacks.
l
XLR mic-level input (balanced), supports 48 V phantom power
l
TRS ¼" professional line-level input, + 4.0 dBu up to 12.3 V RMS, (+24 dBu)
(balanced/unbalanced)
l
One 3.5 mm stereo mic level input for electret microphones (unbalanced)
l
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
. 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
.
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 7
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.
Electret microphone
XLR
Add +18 to +40 dB gain to the audio input port.
3.5 mm
Add +6 to +12 dB gain to the audio input port.
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