JDS Labs OBJECTIVE2+ODAC REVB User manual

OPERATING INSTRUCTIONS | AMP+DACS
OBJECTIVE2+ODAC REVB
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SECTION 1
QUICK SETUP
STEP 01
Connect included 15VAC adapter to
power jack, then connect adapter to
wall outlet
STEP 02
Connect USB cable between your
computer and the USB jack
Connect headphones to the front
Headphone output jack
STEP O3 STEP O4
Press the Power button on the front,
left side of the amplifier. Keep volume
low until music is playing
STEP 05
Slowly raise the volume knob to an
appropriate listening level.
See listening tips on page 6

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SECTION 2
CONFIGURATION
CONNECTIVITY
LISTEN TO HEADPHONES VIA USB DAC INPUT
Connectivity described below applies to JDS Labs Objective2+ODACs manufactured
beyond December 2017. Please refer to your specific order for exact functionality.
HEADPHONE AMPLIFIER: In use FRONT
Connect headphones
Do not connect right, 3.5mm input
DAC: In use REAR
Connect USB input

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LISTEN TO HEADPHONES VIA ANALOG INPUT
HEADPHONE AMPLIFIER: In use FRONT
Connect Headphones
Connect source to right, 3.5mm input
DAC: Bypassed REAR
Optionally connect USB cable

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LISTEN TO EXTERNAL SPEAKERS OR AMPLIFIER VIA
USB DAC INPUT
HEADPHONE AMPLIFIER: Bypassed FRONT
Move headphones to right 3.5mm jack
to bypass amplifier and mute head-
phones. This connection is important
for optimal line-output performance!
DAC: In use REAR
Connect external speakers or amplifier
to the rear, dedicated 3.5mm or RCA
line-output.
Line-output volume may be adjusted at
your receiving amplifier or from your
PC. Disconnect rear output when using
headphones.
Your O2+ODAC must be equipped with “Dedicated DAC line-output”

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LISTENING TIPS
For maximum signal fidelity, set the
DAC to 24-bit audio and adjust digital
volume slightly below 100% at your
computer. Only control volume from
the amplifier.
Objective2+ODAC can amplify
headphones to dangerously loud audio.
Listen safely to conserve your hearing:
www.hearingloss.org
Set sampling frequency to match the
majority of your music (i.e., use 44100
Hz for 44.1kHz music).
To ensure an optimal noise floor,
always position headphone amplifiers
as far away as possible from wireless
devices.
INCLUDED ITEMS
-Objective2+ODAC
-15VAC Adapter
-3 ft. USB Cable
SETTING GAIN
Press the gain button (right of volume knob) to toggle between low or high gain
amplification. Always use the lowest gain necessary.
Switch to high gain only when you’re unable to achieve desired listening volume at
low gain.

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SECTION 3
SETUP
COMPUTER SETUP
The Element requires no drivers in Windows, Mac OS X, or Linux. Most
operating systems immediately recognize and set the DAC as the default
playback device. To manually select the playback device in:
Windows Vista/7/8/10 - Right click
volume icon in taskbar, click
Playback Devices, set ODAC RevB as
default device.
Suggested Properties (Right click
ODAC RevB “Speakers” icon):
yEnhancements: Check
“Disable all
enhancements”
yAdvanced: See Listening
Tips
Mac OS X - Ensure ODAC RevB is
selected from Audio Devices

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TROUBLESHOOTING
Objective2 does not turn on, or power LED is on but output is silent
Cause: Wrong or missing power adapter
Solution: Connect proper AC adapter
Distortion at high gain
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.
Solution: Use low gain or reduce DAC volume at computer.
POWER ADAPTERS
ATTENTION: Incorrect power adapters can result in capacitor
explosion hazards and device damage. Only use the power
adapter included with your O2+ODAC:
Type: AC-to-AC Transformer Output Voltage: 15VAC
Current: Minimum 500mA Connector: 2.1x55.mm (ID x OD)
No sound in one channel
Cause: Bad output cable, or incorrect computer settings
Solution: 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)
Cause: Weak USB power, or bad USB cable
Solution: Use a powered USB hub or different computer; try another USB cable

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Application for Council Directives 2004/108/EC, 2006/95/EC, 2002/95/
EC.Conformity declared for EN55022:2011, EN611000-3-2, EN61000-3-
3, EN55024-2
This equipment has been tested and found to
comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules.