Audio Research reference dac Manuale utente
User Guide
H I G H D E F I N I T I O N ®
REFERENCE DAC
Digital Media Bridge
3
Contents
Model Reference DAC Digital Media Bridge
Illustrations 4
Menu Tree 5 – 7
Explanation of Icons 8
Preface 9
Warnings 9
Packaging 9
Installation of Vacuum Tubes 9
Description of Controls 10
Connections 11
Installation Instructions 11
Settings Menu 11 – 12
Operating Procedure 12
Input Operation 13
Windows Software Installation 14 – 15
Mac Software Installation 15 – 16
Software Settings 16 – 18
Troubleshooting 19
Servicing 19
Cleaning 19
Disposal and Recycling Guidelines 19
Limited Warranty 20
Compatibility and Connectivity 21
Specications 22
4
INPUT
VOLUME
POWER <SELECT EXIT>MUTE
DIGITAL MEDIA BRIDGE REFERENCE DAC HIGH DEFINITION
USB MEM
1.5A FUSE
SLO-BLO
T1A (230V)
WARNING
TO PREVENT FIRE AND SHOCK HAZARD, DO NOT
EXPOSE THIS DEVICE TO RAIN OR MOISTURE.
UNIT MUST BE OPERATED IN A HORIZONTAL POSITION.
-DO NOT OPERATE WITH COVERS REMOVED-
UNIT CONTAINS VOLTAGES WHICH MAY BE HAZARDOUS.
+12V REMOTE
TRIGGER OUT
VOLTS
SERIAL
140W MAX 50/60 HZ ~
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION !
CAUTION
FOR CONTINUED PROTECTION AGAINST
FIRE HAZARD REPLACE FUSE ONLY
WITH SAME TYPE AND RATING
WiFi
ANTENNA
TOSAES/EBUBNCRCAUSB2.0HS ETHERNET
iPod
RS-232 IR
INPUT
RIGHT CHANNEL LEFT CHANNEL
PLYMOUTH, MINNESOTA
MADE IN U.S.A.
REFERENCE DAC
DIGITAL MEDIA BRIDGE
DIGITAL INPUTS
ANALOG OUTPUTS
EXIT
BAL L BAL R
INVERT
MONO
POWER
VOL DN VOL UP
PAUSE
PLAY
SAMPLE
MUTE
FILTER
HOURS
REFERENCE DAC
INPUT
SHUFFLE REPEAT
H I G H D E F I N I T I O N ®
5
6
7
8
Play
Pause
Mute
AES/EBU
BNC
RCA
Media Server
iPod
Internet Radio
MEM
USB Stick
HS
USB 2.0 HS
Toslink
1Repeat One
Balance Left
Balance Right
Invert
Sharp Filter
Soft Filter
Mono
Repeat All
Shufe
Selected
Loading
Music File/Album
Song/Station
Settings
Status BarMain Menu
Functional
Icons
9
Preface
Please take time to carefully read and understand the
following instructions before you install or attempt to
operate your Audio Research Reference DAC Digital
Media Bridge. Becoming familiar with the product and
its correct operating procedures will help assure you of
maximum musical enjoyment and reliable operation.
The effort you invest now will be well rewarded in the
years ahead.
Warnings
1. To prevent re or shock hazard, do not expose this
product to rain or moisture.
2. Do not place objects containing water on top of
this unit.
3. The appliance coupler at the rear of this unit must
be accessible for emergency power disconnect.
4. The Power button on the front of this unit, when off,
DOES NOT DISCONNECT ALL POWER from this unit.
This unit is in SLEEP MODE when not ON.
5. This unit operates on voltages which can cause
serious injury or death. Do not operate with covers
removed. Any necessary servicing should be
carried out by your authorized Audio Research
dealer or other qualied electronics technician.
6. The power cord supplied with this unit is safety
tested and is equipped with a proper grounding
plug. If used normally, it will provide a safe earth
ground connection of the chassis. Defeat of the
grounding plug or use of a power cord without a
grounding plug, or any unauthorized modication
of the active circuitry or controls of this unit,
automatically voids warranty coverage, and
could cause injury or death.
7. For safe operation and protection against re
hazard, replace fuses only with those of the same
type and rating as those supplied with this unit.
Packaging
Save all packaging accompanying this product. You
have purchased a precision electronic instrument,
and it should be properly cartoned any time shipment
becomes necessary. It is very possible that this unit
could be damaged during shipment if repackaged in
cartoning other than that designed for it. The original
packaging materials help protect your investment from
unnecessary damage, delay and added expense
whenever shipment of this unit is required.
DO NOT ATTEMPT TO OPERATE THIS EQUIPMENT BEFORE
INSTALLING THE NUMBERED VACUUM TUBES IN THEIR
RESPECTIVE SOCKETS.
Installation of Vacuum Tubes
This unit has been shipped with the vacuum tubes in
a protective foam block inside a separate box. Using
a phillips-head screwdriver to loosen the fastening
screws, remove the top cover and set aside.
After removing the top cover open the box of vacuum
tubes and see the accompanying illustrated sheet for
instructions on installing the tubes for your Reference
DAC in their proper locations in the power supply
and audio section. Note that the numbers written on
each tube correspond to a ‘V’ number printed on the
circuit board next to each tube socket. Insert each
tube rmly, carefully aligning the tube pins with the
corresponding socket holes.
WARNING!
Do not attempt to install or remove any
vacuum tubes unless this unit is turned off
and disconnected from the A.C. power
outlet. Unit should be connected to the A.C. outlet
and turned on only after all vacuum tubes have been
installed and appropriate panels have been replaced
and fastened. See owner’s manual for installation
instructions.
Before replacing vacuum tubes, turn off unit,
disconnect from A.C. outlet and allow installed tubes
to cool before attempting to remove them. Hot tubes
may cause burns or other injury if not allowed to cool
before removal.
When removing or installing tubes, do not touch tube
socket contacts or other components as the circuit
may retain sufcient levels of voltage and current to
cause injury or death.
Contact your dealer or Audio Research Customer
Service (763-577-9700) if you have any questions about
installing or replacing vacuum tubes in this unit.
FRONT
REAR
TUBE LOCATIONS
TOP VIEW
V6
V5
V4
V3
V2
V1
10
Description of Controls
Front Panel Rotary Controls
The Reference DAC has two microprocessor-driven
rotary controls.
The rotary control on the left adjusts Volume (output
level) up or down for both L and R channels. Volume
control is also selectable via Vol UP and Vol DN buttons
on the remote control. Volume adjustment is indicated
in the display window by numeric digits on 0–103 scale.
Do not turn volume up beyond normal listening levels
when ‘mute’ is engaged to avoid unexpected or
possibly damaging sound levels. Reduce volume level
whenever changing input sources, even when muted.
The rotary control (on the right) selects any of the
inputs on the Reference DAC, and is also a navigator
through the settings and front panel interface.
Front Panel and Remote Control Buttons
POWER ON/OFF: Supplies power from A.C. wall outlet
to DAC; indicated by active display window.
After pressing the Power button to turn on unit, the
display will remain black for approximately 8 seconds,
after which the Reference DAC splash screen will
appear. Once the splash screen is gone, the main
menu page is displayed, and a countdown timer will
show the seconds until the unit is ready for operation.
After countdown, the unit will be in Mute.
MUTE: When activated, electrically mutes all output of
the DAC; indicated by ‘Mute’ in display window. This
control should be activated before switching inputs,
changing connections or shutting down your audio
system to help protect your amplier and speakers
from unexpected signal pulses. When deactivated,
‘Mute’ disappears from the display window allowing
normal operation. Function also on remote control.
The Reference DAC also has automatic muting to
help protects system components during A.C. power
interruptions or low line voltage. When sensing these
conditions, the preamp automatically goes into
‘Mute’ and disables all outputs. The Reference DAC
will reset itself and begin the initial startup sequence as
described under ‘Power On/Off’.
Note that automatic muting is only designed to protect
against power line interruptions or severe voltage drop.
It will not mute in the event of subsonic transmissions
from a faulty input source, amplier failure or speaker
malfunction.
SELECT: Pressing the Select button engages the
highlighted input on the screen, or advances the
Reference DAC to the next screen when using the
settings menus. It also is used to select folders and
tracks when using an i-device or media server, or
stations for the internet radio tuner. Function also on
remote control (center button of navigation pad).
LEFT/RIGHT ARROWS (< >): Used during menu
navigation. The Right arrow (>) will advance the
Reference DAC to the next screen or selection, and
the Left arrow (<) will go back one screen or menu
selection. Function also on remote control (Left and
Right arrows on navigation pad).
EXIT: Toggles the Reference DAC from the current
screen to the main menu/input selection screen.
VOLUME UP/DOWN : Using rotary control on front panel
or VOL UP/VOL DN buttons on remote, increases/
decreases overall volume level of both channels
equally for whichever input has been selected.
Caution: do not turn up volume beyond normal
listening levels when “Mute” is engaged to avoid
unexpected or possibly damaging sound levels. It is
a good idea to reduce volume whenever changing
program sources, even when muted.
INPUT: Moves the selection bar up or down on the
display. Turn the Input knob to the left or right to
highlight an input, and then press the ‘Select’ button
to choose that input. Also use the Input knob to move
the selection bar to the desired function or folder
when navigating the settings menu or music folders.
Function also on remote (Up and Down arrows on
navigation pad).
Remote Control only Functions
FILTER: Selects between Sharp or Soft digital lter
algorithms.
MONO: Sums L and R input for mono output from any
source selected.
SAMPLE: Selects between the native sample rate of
the incoming signal or integer-based upsampling
(Ethernet client board, Media server, iPod, internet
radio, USB stick, max is 88.2 and 96kHz, SPDIF inputs,
max is 176.4 and 192kHz, and USB2.0HS, upsampling is
selected in the computer; not done in hardware).
INVERT: Inverts absolute phase of the output signal.
INPUT: Toggles through the different digital inputs.
REPEAT: Toggles the Reference DAC between Repeat
All and Repeat One track and no repeat.
SHUFFLE: Toggles the Shufe feature on and off. Shufe
instructs the Reference DAC to randomly select tracks
from a device or folder.
NOTE: Repeat and Shufe only function with
the following inputs: Media Server, Ipod
Dock, USB Input.
HOURS: When pressed, displays number of operating
hours vacuum tubes have been in service. WARNING:
after replacing tubes, this function should be reset
to ‘0’ only by a qualied technician. Hours display
can be reset to ‘0’ by pressing black button labeled
located on upper right corner of circuit board directly
behind display window. The unit must be “On” to
reset function – the service technician must be careful
to avoid any contact with other circuit components
during reset operation. Contact Audio Research
customer service (763-577-9700) for information
regarding this procedure.
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