The USB and Bluetooth sources from the EX-UBT are digital (dBFS) sources. When the host device is set to 100%
volume, the signal will likely average -12 dBFS but will appear on Tesira audio meters as +12 dBu. If the host volume is
set to 50%, the signal will average approximately -24 dBFS or 0 dBu.
As a point of comparison, most analog microphones have their input gain adjusted so that a good signal will meter
between 0 and 6 dBu. When mixing dBFS signals with microphone or line-level dBu signals in the Tesira configuration,
consider using attenuation or dynamics to level match these different source types.
The EX-UBT Bluetooth input block does include a Peak indication LED. This indicator will illuminate when the signal
peak is 3 dB below clip (0 dBFS). A brief flickering of this indicator is acceptable and typically indicates the host
Bluetooth device volume is likely at 100%. Turning down the volume on the host Bluetooth device will lower the signal
accordingly. Based on the expected system performance, users may consider attenuating the Bluetooth input block as
shown in the following image:
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