JDS Labs cMoyBB Operating Instructions

1. Connect an audio source to the Input jack using a 3.5mm interconnect cable.
2. Connect headphones to the Output jack.
3. Turn the Volume knob clockwise to power on the amplifier. Keep volume low until music is playing.
4. Slowly raise the cMoyBB's Volume knob to an appropriate level. See Listening Tips below.
• Bass boost can be turned on or off by moving the toggle switch right or left, respectively. Do not
expect your headphones to be able to play as loudly with bass boost turned on—this feature
pushes headphones to the limit.
• Dead/weak batteries should be avoided. If sound quality has degraded or distorts at high volumes
or with bass boost, try a new battery or an 18V+ DC adapter. High voltage DC adapters can greatly
extend the dynamic range of the cMoyBB.
• You should hear no noise or whining with your audio player plugged in and paused/muted. Each
cMoyBB is hand tested to ensure that it produces an extremely clean signal. If noise is present or
audio is significantly distorted at all volumes, try a different cable. New cables can be faulty!
Listening Tips
 For maximum sound quality, turn your audio player's volume up very high (60-80%) and only use the
cMoyBB's volume control. As a general guideline, the source volume should be set so the amplifier
plays cleanly to slightly past half of its volume knob rotation.
 Many audiophiles agree that new headphones and amplifiers require tens to hundreds of hours to
"break-in." Past cMoyBB customers have reported remarkable changes after 50-75 hours of usage.
 This amplifier can produce dangerously loud music. Please be sensible and listen safely.
Thank you for purchasing the cMoyBB. If you have additional questions or comments, feel free to contact us
at: contact@jdslabs.com
JDS Labs Model # cMoyBB v2.03
cMoyBB™ is a trademark of JDS Labs, Inc. Other brands and marks are the property of their respective owners.
cMoyBB Headphone Amplifier
Operating Instructions
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