3

Use the Marantz as your pre-amp. Route the audio out of one of its 'Recorder' outputs. This should give you consumer-level output, nominally -20dB. Input to the Behringer on a switchable input mic/line/instrument & flick between the options to see which gives you the best impedance/level match - probably line or instrument. Watch levels as you do this, ...


2

There is no formula you can use to make this conversion. It is unlikely your webcam would be suitable as a sound sensor due to the processing involved in detecting and multiplexing the audio into the visual data stream. Also, the 'dB' values you are quoting are meaningless. In order to be able to detect something useful, you would need a raw feed from the ...


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