FRONT PANEL CONTROLS
A
DIGITAL INPUT SELECT: Selects any of the 4 digital inputs. Positions 1, 2
and 3 correspond to the RCA phono style S/PDIF and the XLR AES / EBU inputs.
Position 4 corresponds to the A.T.&T. Optical input. When the switch is changed
the output mutes until "VALID DATA" is "LOCKED" by the AES 21 jitter
reduction chip.
B
32, 44.1, 48: 3 red LEDs that indicatethe sample rate of the incoming data. CD's
are always 44.1 while the sample rate of DAT's may be any of the three.
C
VALID DATA LED: Lit when the unit has a readable input that can be converted
to audio. This immediately indicates a "good" input
D
ERROR LED: Lit when audio is muted. There are several conditions that will
cause this. 1) Warm - up timer approximately 30 seconds. 2) momentary loss of
data including changing the DIGITAL INPUT SELECT. 3) any cable related loss
of data, unreadable data or data errors. 4) The phase-locked loop has not yet locked
or electronic latch-up. If the converter has been on for over a minute and the LED
is lit the problem can usually be remedied best by powering off the converter for
10 seconds and powering up again.
E
VOLUME: This is a precision 4 stack stepped attenuator. Because some users
prefer to feed the outputs of this unit directly to their power amps this VOLUME
becomes their main volume control. Other users with a preamp can use this control
to match the output of the D to A to thier analogue sources avoiding level jumps.
F
DE-EMPH LED: Lit when the digital source has been "pre-emphasized" and the
converter is performing the De-emphasis equalization. Few CD's have been pre-
emphasized so the chances of seeing this lit are rare.
A
C
B
D
E
F G
H
I
J K
L
