13
HDCD
®
Gain-Matching
Some HDCD-encoded recordings are mastered at a level which is no-
ticeably lower (6 dB) than conventional recordings, to allow for greater
dynamic peaks. To avoid unexpected changes in average volume when
going from one disc to another, the Nº360S can automatically reduce
the volume of all recordings by six decibels. To remind you of of when
it is in this mode of operation, the Nº360S will display “
-6 dB PAD”
when locking on a digital input signal in the
HDCD AUTO mode.
In our listening tests, we have determined that the only sonically trans-
parent gain-matching technique is to raise the volume of the preampli-
fier by the requisite 6 dB when playing those discs that require it. All
other design options introduce a compromise in sound quality.
For Best Performance: We strongly recommend that you use the HDCD
MANUAL gain-matching in your Nº360S digital audio
processor.
If you are using the Nº360S with a Mark Levinson Nº380 or Nº380S
preamplifier, simply name the appropriate input on the preamplifier
“No36” (explained in the preamp manual), and connect the two prod-
ucts with a Communications Link cable. In this case, the Nº360S will
tell the preamplifier to change its volume setting as necessary to com-
pensate for differing CD mastering techniques, and you never have to
think about it. (The preamp’s display will show “HD+6” to indicate a
change required by the HDCD recording being played through the
Nº360S; it will revert to normal and show “HD+0” when you return to
conventional recordings. Older Nº38 and Nº38S preamplifiers may re-
quire a new EPROM to take advantage of this feature.) This technique
ensures that you always get the best possible sound from your system,
without any unexpected changes in level, regardless of the recordings
you play.
If you are using the Nº360S with any other preamplifier, follow the
steps below. (You will have to adjust the volume on some HDCD re-
cordings manually.)
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