Wisdom in mind,   enthusiasm at heart.

SA-31SE

Discrete Preamp / Headphone amp
Applied Diamond Difference design
Power output 10,000 mW @ 40 ohm

The rule of the power ON /  OFF:
Power On :
     Source power ON ---->    SA31 power ON ----> Amp power ON
Power Off:
    Amp power OFF ---->  SA31 power OFF   ---> Source power OFF .

Volume Down and Up button on front plate:
1. After powering on the SA-31, it will display “SA-31” three times and show the last settings before power off. If you push and hold the "volume down" button for one second, SA-31 will forget the volume level previously set and reset the volume to zero, other settings being unchanged. Otherwise, if you push and hold the "volume up" button for one second, SA-31 will resume the volume level previously set, other settings also being unchanged.
2. Push “volume up” or “volume down” button once to change the volume in single step.
3. Push and hold “volume up” or “volume down” button to change the volume quickly.