About the supplied manuals
The following three manuals come with the headphone amplifier.
Help Guide (this data)
Operation manual on the Web, which can be accessed by a PC or smartphone, provides the detailed information on how to use the headphone amplifier and troubleshooting, etc.
Start Guide (enclosed paper)
Provides basic information on how to connect or use the headphone amplifier.
Reference Guide (enclosed paper)
Provides precautions and specifications.