O P E R AT I N G I N S T R U C T I O N S | A M P L I F I E R
OBJECTIVE2
SUPPORT
ONLINE
BY PHONE
BY MAIL
C O N TA C T @ J D S L A B S . C O M
314-252-0936
909 N BLUFF RD
JDSLABS.COM/SUPPORT
9 : 3 0 A M - 6 P M C S T,
M O N D AY T H R O U G H F R I D AY
COLLINSVILLE, IL 62234
U N I T E D S TAT E S
SECTION 1
QUICK SETUP
STEP 01
STEP 02
Connect AC power adapter to
15VAC power jack, then
connect to wall outlet.
Connect a cable from your audio
player to input jack.
STEP 03
STEP 04
Connect headphones to the front
headphone output jack.
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 5
JDSLABS.COM
2
SECTION 2
C O N F I G U R AT I O N
CONNECTIVITY
Objective2 accepts analog input through the front, right 3.5mm input jack, or by RCA
jacks if customized.
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.
Maximum RCA Analog Input Level
6.5x Gain
1.08 VRMS (+2.9 dBu)
4.5x Gain
1.56 VRMS (+6.1 dBu)
3.5x Gain
2.00 VRMS (+8.2 dBu)
3.3x Gain
2.12 VRMS (+8.7 dBu)
2.5x Gain
2.80 VRMS (+11.2 dBu)
1.0x Gain
7.00 VRMS (+19.1 dBu)
JDSLABS.COM
3
LISTENING TIPS
Listen safely to conserve your hearing:
www.hearingloss.org
To ensure an optimal noise floor,
always position audio equipment as far
away as possible from wireless devices.
O P E R AT I N G C A R E
Objective2 can be safely powered on
24/7.
Use gentle force when inserting or
removing cables.
CHARGING INSTRUCTIONS
1. Connect an AC power adapter to the 14-20 VAC Jack, then connect AC adapter to
wall. Amplifier can be used simultaneously.
2. Charge time for included NiMH batteries is ~24 hours.
3. Objective2 charges indefinitely at a low current. No charge indication is necessary
or provided. Simply disconnect the power adapter as needed.
INCLUDED ITEMS
-Objective2 Headphone Amplifier
-15VAC Adapter
JDSLABS.COM
4
TROUBLESHOOTING
Objective2 produces no sound, but power LED is on
Cause: Batteries are low
Solution: Connect AC adapter to recharge.
Objective2 turns off unexpectedly and/or produces clicking or popping
sounds
Cause: Batteries are low
Solution: Immediately turn the amplifier off or connect to AC adapter. Failure to turn
amp off for long durations of popping sounds may damage headphones.
Objective2 does not charge, charges only 1 battery, or clicks while
connected to power adapter
Cause: Incorrect power adapter
Solution: Use a 14-20VAC power adapter. See notes below.
Distortion at high gain
Cause: Objective2’s volume control resides between its input and output stages. Some
combinations of headphones and line-level sources can overdrive the Objective2’s
input stage. Refer to NwAvGuy’s blog for thorough explanation.
Solution: Use low gain or reduce source volume. Stronger AC adapter can sometimes
help.
POWER ADAPTERS
ATTENTION: Incorrect power adapters can result in capacitor
explosion hazards and device damage. Only use the power
adapter included with your Objective2:
Type: AC-to-AC Transformer
Output Voltage: 15VAC
Current: Minimum 500mA
Connector: 2.1x5.5mm (ID x OD)
JDSLABS.COM
5
Application for Council Directives 2004/108/EC, 2006/95/EC, 2002/95/
EC.Conformity declared for EN55022:2011, EN611000-3-2, EN61000-33, 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.
JDSLABS.COM
6