13
HDCD
®
Gain-Matching
Some HDCD-encoded recordings are mastered at a level which is notice-
ably lower (6 dB) than conventional recordings, to allow for greater dy-
namic peaks. To avoid unexpected changes in average volume when going
from one disc to another, the Nº30.6 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 Nº30.6 will display the input’s name and “
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 transpar-
ent gain-matching technique is to
raise
the volume of the preamplifier by
the requisite 6 dB when playing those few discs that require it.
All other de-
sign options introduce a compromise in sound quality.
For Best Performance:
We strongly recommend that you use the HDCD
MANUAL gain-matching in your Nº30.6 digital audio
processor.
If you are using the Nº30.6 with a Mark Levinson preamplifier
, simply
name the appropriate input on the preamplifier “No30” (explained in the
preamp manual), and connect the two products with a Communications
Link cable. (
If you have a Nº32 Reference Preamplifier, you can select the
name “Nº30.6,” since that preamp has enough extra characters to show the
entire name of the processor.
) When you have done so, the Nº30.6 will tell
the preamplifier to change its volume setting as necessary to compensate
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 nor-
mal and show “HD+0” when you return to conventional recordings. Older
Nº38 and Nº38S preamplifiers may require 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, regard-
less of the recordings you play.
If you are using the Nº30.6 with any other preamplifier
, follow the steps
below. (You will have to adjust the volume on some HDCD recordings
manually.)
