OPERATING INSTRUCTIONS | AMPLIFIERS
EL AMP II
SUPPORT
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CONTACT@JDSLABS.COM
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UNITED STATES
SECTION 1
SECTION 2
QUICK SETUP
STEP 01
Connect AC power adapter to rear power jack
(16VAC), then connect to wall outlet
STEP 02
Connect a cable from your audio player to the
RCA Input jacks
CONFIGURATION
Connectivity
EL AMP II accepts analog input via RCA jacks.
Maximum RCA Analog Input Level (High Gain):
Maximum RCA Analog Input Level (Low Gain):
Setting Gain
2.2 VRMS (+9 dBu)
9.9 VRMS (+22 dBu)
STEP 03
Connect headphones to the front
headphone output jack
STEP 04
Press the power button on the rear side of the
amplier. Keep volume low until music is
playing
Press the gain button to toggle between low or high gain amplication. Always use the lowest
gain necessary.
Switch to high gain only when you’re unable to achieve desired listening volume at low gain.
Source Safety
EL Amp II is DC coupled for maximum signal quality and requires an input source with < 4.5mV
of DC oset for safe operation. All JDS Labs DACs and consumer audio sources are safe to use.
If you experience warm headphones, a loud pop when changing gain, or severe rustling sounds
while adjusting volume, immediately power o and contact the manufacturer of your audio
source to ensure DC oset is below 4mV.
STEP 05
Slowly raise the volume knob to an
appropriate listening level. See listening tips on
page 5
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Preamp-Output Functionality
EL Amp II provides headphone output and RCA Preamp Outputs. Hold the Power/Mode button
for at least 1 second to toggle between these modes. Only one mode is active at a time. Volume
is adjustable in either mode.
HEADPHONE OUTPUT MODE
Listening Tips
EL Amp II can amplify headphones to
dangerously loud audio. Listen safely to
conserve your hearing:
www.hearingloss.org
To ensure an optimal noise oor,
always position headphone ampliers as
far away as possible from wireless devices.
USB
INPUT
HEADPHONE
AMPLIFIER
DAC
RCA JACKS
(LINE-OUTPUT)
RCA OUTPUT MODE
AUDIO TO
HEADPHONES
SPEAKERS
MUTE
Operating Care
EL AMP II uses a high current power supply
and runs warm to the touch. Avoid
covering the top and sides.
Do not lift the amplier by knob, or turn
knob beyond its limits.
EL AMP II can be safely powered on 24/7.
For maximum relay lifespan, cycle power at
least once per month.
Use gentle force when inserting or
removing cables.
USB
INPUT
HEADPHONE
AMPLIFIER
DAC
RCA JACKS
(LINE-OUTPUT)
HEADPHONES
MUTE
AUDIO TO
SPEAKERS
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Troubleshooting
Amplier does not turn on
Cause: Missing or loose power adapter connection.
Solution: Firmly connect AC adapter to 16VAC power jack.
Internal LED ashes, then turns o
Cause: Wrong power adapter detected.
Solution: Please see Power Adapters section below.
No sound in one channel
Cause: Bad cable, or incorrect computer settings.
Solution: Check balance settings; try another headphone or RCA cable. Some Mac OS X systems
will pan audio to the Left channel upon initial connection of a DAC. User must restore balance
to center.
No sound from headphones
Cause: Wrong mode, or incorrect connectivity, or incorrect setup
Solution: Please see Connectivity page to toggle between Headphone or RCA Output. Check
cabling.
Power Adapters
ATTENTION: Incorrect power adapters can result in capacitor
explosion hazards and device damage. Only use the power adapter
included with your Element:
Type: AC-to-AC Transformer Output Voltage: 16 VAC
Current: Minimum 1000mA Connector: 2.1x55.mm (ID x OD)
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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, EN61000-33, 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.
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