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INSTALLATION ORBAN Model 8400
dither, and you should set it to do so if the input material is insufficiently
dithered for these lower word lengths.
Dither turns on or off addition of “high-pass” dither before any truncation of the output
word.
The amount of dither automatically tracks the setting of the Word Length
control. This first-order noise shaped dither considerably reduces added
noise in the midrange by comparison to white PDF dither. However, unlike
extreme noise shaping, it adds a maximum of 3 dB of excess total noise
power when compared to white PDF dither. Thus, it is a good compromise
between white PDF dither and extreme noise shaping.
In many cases, the source material has already been correctly dithered, so
you will not need to add dither and can set this control to
Out. However, par-
ticularly if you use the Noise Reduction feature, the processing can some-
times attenuate input dither to a point where it is insufficient to dither the
output correctly. In this case, you should add dither within the 8400.
Sync determines if the sample rate appearing at the digital-channel output is synced to the
8400’s internal clock or to a signal appearing at the HD sync input.
This function is independent of the sync function for the FM digital output.
The sample rates of the digital-channel and FM digital outputs will be iden-
tical when both are set to internal sync and the same sample rate.
If there is no sync signal detected at the HD sync input, the digital-channel
output will always sync to the 8400’s internal clock.
If you want the digital-channel and FM digital outputs to have identical sam-
ple rates when externally synchronized, you must apply identical reference
sample rates to the HD sync input and to the FM sync input or the digital
audio input as desired. (Set the FM digital output so that it syncs to the FM
sync or digital audio input respectively.)
There is no means for internally synchronizing the digital-channel output’s
sample rate to the 8400’s digital audio input or FM sync input. If you wish
to sync the digital-channel output sample rate to the sample rate present at
the digital audio input, you must apply the same sample rate to the digital
audio input and the HD sync input.
Format determines if the digital-channel output follows the professional AES/EBU or
consumer SPDIF standard.
We expect that AES will be appropriate for almost all users, but some con-
sumer sound cards may require SPDIF.
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