Precsion Class A Headphone Amplifier
LEF Headphone Amplifi
8. Listening Etiquette
Excessive sound pressure from headphones and earphones can cause hearing
impairments. Take care not to increase the volume too much.
When adjusting the sound volume level, make sure you do not disturb other people and
The packaging of HD53N should contain the following:
1. HD53N unit
2. AC Power Cord
3. Owner’s manual
NOTE: Keep the packaging available for future transportation needs.
The AC power cord is for use with HD53N exclusively, and should not be
used for other devices.