AUDAC SourceCon MMP40, User Manual

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Using ‘ Mono (left input) ’, only the signal available on the left recording input will be
recorded as a single (mono) audio signal.
Using ‘ Mono mix’ , both left and right signal inputs will be summed to a mono signal,
which will be recorded as a single (mono) audio signal.
MP3:
The MP3 recording settings can be selected between ‘ Variable bitrate’ and ‘ Constant
bitrate ’. In constant bit rate mode, a fixed bitrate is used for the entire track resulting
in consistent and predictable file sizes. In variable bitrate mode, the bitrate is adapted
according to the complexity of the audio. For simple passages, the system automatically
turns the bitrate down, saving valuable data bits while retaining audio quality. During more
complex passages, the system automatically turns the bitrate up, using more databits to
retain the same level of audio quality. In general, the variable bitrate gives better results
in terms of audio quality, while the constant bitrate is better for compatibility (mainly
with older systems).
The bitrate for the audio recording can be selected between 64 kbps, 96 kbps, 128
kbps, 192 kbps, 256 kbps and 320 kbps. A bitrate of 192 kbps is generally accepted
as good-quality, while a 256 kbps recording corresponds with CD quality. For constant
bitrate recordings, the selected bitrate is constant throughout the entire track, while for
variable bitrate recordings the nominal bitrate is defined, which could be influenced by
the complexity and detail of the audio.
OGG Vorbis:
For OGG Vorbis recordings, the quality settings can be selected by a number from ‘0’
to ‘9’, whereby ‘0’ corresponds with a nominal bitrate of 64 kbps and ‘9’ corresponds
with a nominal bitrate if 320 kbps. Starting from ‘6’ (192 kbps) the recording is generally
accepted as a good-quality recording, while ‘8’ (256 kbps) corresponds with CD quality.
An OGG recording provides the same quality for a lower filesize, compared to MP3.
WAV:
For WAV recodings, the sampling rate can be selected between 8 kHz, 16 kHz, 24 kHz, 32
kHz and 48 kHz with a fixed bit depth of 16 bits per sample. Depending on the application,
the suitable sample rate can be selected. For high-quality music recordings, it is
recommended to always select the 48 kHz sample rate, while for voice announcements
or other spoken message recordings, lower sample rates can be sufficient.