JDS Labs Model # OBJODAC | Last updated June 4, 2015
Pg. 2 of 2
Power Adapters
ATTENTION:
Incorrect power adapters can result in capacitor explosion hazards and device damage.
Required power adapter characteristics for the Objective2 include:
Type:
AC-to-AC transformer
Voltage:
14-20V
AC
output
Current:
Minimum 200mA
Connector:
2.1x5.5mm (ID x OD)
Please note that Objective2 strictly requires an AC-to-AC adapter.
AC/DC
adapters differ greatly from
AC/AC
adapters.
Manufacturers commonly abbreviate and refer to all types simply as "AC Adapters", which gives no indication of their
actual type. Be aware that most adapters are in fact AC/DC type. These power adapters are used with laptops, game
consoles, computer peripherals, etc., and are
not
compatible
with the Objective2.
Please refer to the ObjODAC item page at www.jdslabs.com for current power adapter recommendations.
Computer Setup
ODAC requires no drivers in Windows, Mac OS X, or Linux. Most operating systems immediately recognize and
set ODAC as the default playback device. To manually select the playback device in:
o
Windows XP
- Double click volume icon in taskbar. Click Options,
Properties, choose ODAC.
o
Windows Vista/7/8/10
- Right click volume icon in taskbar, click
Playback Devices, set ODAC as default device. Suggested
Properties (Right click ODAC "Speakers" icon):
•
Enhancements: Check "Disable all enhancements"
•
Advanced: 24 bit, 96000 Hz
o
Mac OS X
-
Ensure ODAC is selected from Audio Devices
Listening Tips
For maximum signal fidelity, set ODAC to 24-bt audio and set digital
volume slightly below 100% at the computer. Only control volume from
the ObjODAC.
Set sampling frequency to match the majority of your music (i.e., use 96000 Hz for 96kHz music).
High-performance audio devices can produce dangerously loud music. Be sensible and listen safely:
www.hearingloss.org
Troubleshooting
•
Objective2 does not turn on, or power LED is on but output is silent
o
Cause: Wrong or missing power adapter
o
Solution: Connect proper AC adapter
•
Distortion at high gain
o
Cause: Objective2 's volume control resides between its input and output stages. Some headphones can
overdrive the Objective2's input stage. Refer to NwAvGuy's blog for thorough explanation.
o
Solution: Use low gain or reduce DAC volume at computer.
•
No sound in one channel
o
Causes: Bad output cable, or incorrect computer settings
o
Solutions: Check balance settings; try another output cable. Some Mac OS X systems will pan audio to
Left channel upon first connection of ODAC. User must restore balance to center.
•
Distorted output or “harsh” treble (constant or intermittent)
o
Causes: Weak USB power, or bad USB cable
o
Solutions: Use a powered USB hub or different computer; try another USB cable
