Grace Design m906 - Page 15

grace design m906
owner’s manual
14
grace design m906
owner’s manual
15
TOSLINK/ADAT ). The name of the current input will be displayed on
line one of the SYSTEM LCD (screenshot 2). Line two will display DAC
status (which is still supplying signal to the FIXED DAC OUTPUTS).
DAC Input source, sample rate and s-Lock status will be displayed.
The TOSLINK/ADAT input switch functions as a toggle between either the TOSLINK or ADAT input.
Pressing once activates the optical input that was last used. Pressing again will toggle to the other
optical input. For example, say you were monitoring a TOSLINK signal and then switched to AES3 1,
pressing the TOSLINK/ADAT switch would activate the TOSLINK input once again. To monitor the ADAT
source, simply press the TOSLINK/ADAT switch again. NOTE: The digital ADAT input is derived from any
one of the four channel pairs of an eight channel ADAT interface. The input pair is selected in CAL mode. To
choose ADAT input pair do the following:

Press the CAL switch. The switch LED will begin to ash, letting you know that CAL mode is now active.

Press the optical input switch. The LCD display will indicate weather you are in TOSLINK or ADAT mode. If
you are in TOSLINK input mode, press the optical input switch once again to reach ADAT mode. The menu is
stepped as follows:
TOSLINK INPUT OFFSET è ADAT INPUT OFFSET è ADAT SOURCE PAIR SELECT è

Once in ADAT INPUT OFFSET MODE, pressing the OPTICAL input switch one more time will bring up the ADAT
SOURCE PAIR SELECT menu. Simply use the main/edit rotary encoder to choose the desired input source
pair.

Press the CAL switch to exit CAL mode and return to normal operation.
Changing the Clock Source
The m906 DAC (Digital to Analog Converter) can be referenced to the embedded clock of a connected
digital source such as AES3, ADAT, S/PDIF or TOSLINK. The DAC can also be clocked by an external
Word Clock or Super Clock signal. The clock type you choose to use is entirely up to you. You may like a
particular external Word Clock generating device that you reference your entire digital audio system to
or you might feel completely comfortable with an embedded clock from a digital audio stream. From
our point of view, it matters little as our s-Lock
tm
PLL (Phase Lock Loop) will automatically be applied
once it detects the incoming clock source. Read more about s-Lock
tm
below.
The SEL switch, located below the LCD window, is used to select the clock source you’d like to use as a
reference for the m906 system. The LCD will show the currently selected source. If you’d like to change
the current selection, repeatedly pressing the SEL switch will cycle you through the available choices
which are: AES, WORD and SUPERCLOCK. The LCD text will ash if there is no valid clock available at
the input selected. When the m906 has locked to the selected clock source the text in the LCD will be
solid. The clock source preference for each digital input is saved in non volitile memory.
About s-Lock
tm
s-Lock
tm
is our new PLL circuitry that has been specically developed for both the m906 and its stereo
brother, the m904. The truly wonderful thing about s-Lock
tm
is that regardless of the condition of the
external clock used as a reference for the m906, s-Lock
tm
will take this clock source and provide an


digital input select/ DAC status
screenshot 2