Drawmer 1962 Digital Vacuum Tube Pre-Amplifier - Manual (Page 21)

1962 OPERATORS’ MANUAL 17
Dither (cont.):
REPLAY A, B, C, D:
The four positions A, B, C and D (in yellow) are used for playback from a
digital multitrack recorder to the AES/EBU and SPDIF outputs, 16bit or High
resolution mode will be automatically selected.
Which specific tracks are replayed are detailed at the bottom of the table on
the following page.
If high resolution tracks are replayed with any of the tracks missing audible
distortion will be heard.
RECORDING:
The multitrack tape must be pre-formatted at the required sample rate with
Emphasis Off before recording from the D62.
When recording to a multitrack machine, the SAMPLE RATE should be set
to EXT CLK and the rear panel INPUT SELECT set to TDIF/ADAT as the
multitrack tape machine must supply the master clock.
Note: On the DA88/DA38 the ‘Fs’ LED will flash, it does not affect the
recording.
High resolution recording:
When the required resolution is greater than that of the multitrack machine,
the 1962 splits the 2 digital signals into 3 channels, where the 3rd channel is
used to store the remainder bits. For example, when using a 16bit multitrack
machine to record a stereo 24bit signal, tracks 1,2, and 3 (or 5,6 and 7) must
be selected. The third channel sounds like white noise and is used to
reconstruct the 24bit signal on playback. With the availability of 20bit and
24bit machines, there is no need to split signals below the word length of the
machine, so 3 software versions are available to ensure full compatibility.
16bit version.
When 'WORD LENGTH' is set to 16 bit, signals are recorded to multitrack
without splitting, so all 8 tracks are available.
If 'WORD LENGTH' is set to 18, 20 or 24bit signals are split into 3 tracks
(1+2+3 or 5+6+7).
20bit version.
When 'WORD LENGTH' is set to 16, 18 or 20 bit, signals are recorded to
multitrack without splitting, so all 8 tracks are available.
If 'WORD LENGTH' is set to 24bit, signals are split into 3 tracks (1+2+3 or
5+6+7).
24bit version.
With this version, there is no need to split the signals, so whichever
resolution is selected, signals are recorded directly, leaving all 8 tracks
available for use.
It is important to remember that for any high resolution recording to be
successful, the (tape) operator must enable recording on ALL of the tracks
of the chosen output group (1+2+3 or 5+6+7).