Pearl Nano User Guide
Adjust audio gain and delay
Microphones typically have low audio signals (less than -30 dBu) and are not supported
directly as inputs to Pearl Nano. Use an audio mixing board or preamp to amplify
microphones and supply the appropriate line level input.
Adjusting the
Input Gain
for an analog audio source affects the volume for that audio source in
recordings, streamed output, video output ports, and in the headphone jack. Be aware that excessive
amounts of gain can increase the perception of any noise that may be present in the audio signal.
If the gain of your analog audio signal needs adjustment, connect your headphones and use the VU
meters to monitor the audio level while you add some gain. As a rule, each 10 dB of gain doubles the
perceived loudness of the audio signal.
This table offers some guidelines for adjusting the gain at the audio input port of Pearl Nano for common
types of audio input 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 22
Audio input port gains guidelines
Audio source
Input
port
Gain
Mobile phone or other
consumer line level
device
XLR
Add +6 to +12 dB gain to the audio input port.
RCA
1
Nominal
Professional mixer
XLR
Nominal
RCA
1
Not recommended.
USB microphone
USB
Nominal
Dynamic, condenser, or
electret microphones
XLR
Not recommended.
To connect microphones to the pro line level XLR inputs, you
must use an external preamp to boost the microphone signal
enough to provide the proper line level signal at the XLR input
port, see
Connecting microphones to the XLR line level inputs
.
1 To avoid unwanted signal noise on the RCA ports, we recommend adding no more than 12dB of gain to the RCA port or when
XLR/RCA is used, see
Assign audio sources to an input
.
Ensure the audio input source is connected to an analog audio input port on Pearl Nano before
proceeding.
108
Summary of Contents for Pearl Nano
Page 100: ...Pearl Nano User Guide Disable the network discovery port 87 ...
Page 315: ...Pearl Nano User Guide Start and stop streaming to a CDN 302 ...
Page 325: ...Pearl Nano User Guide Viewing with Session Announcement Protocol SAP 312 ...
Page 452: ...Pearl Nano User Guide Register your device 439 ...
Page 484: ... and 2021 Epiphan Systems Inc ...
