Please note:
         For avoid the vacuum tubes damage during shipping, we assemble the foam in the unit, user get the unit, must remove the top board and remove the inside foam , then assemble the top board and can power on it .
         For avoid the sound quality degrade, the unit has not built the output delay design.
         After power on the unit, the display will blinking around 30 second, we are recommend power on the power amp after the display stop blink .

Auto / manual gain control:
         The product has 9 steps gain modes . The gain can set auto or manual control . 
          Push the left button once, the bottom display show "Ag. OFF" or "Ag. ON" , push the right button can set either "OFF" and "ON".
          While set to "Ag. ON" mean  auto gain control, the gain will follow the volume step change auto .
          While set to "Ag. OFF" mean  manual gain control , user can through turn the volume knob to set the gain between 1 to 9 , that can better match the different output level of the sources .


Auto dim the display:
         Push the left button once again , the bottom display show "Ad. OFF" or "Ad. ON", push the right button can set either "OFF" and "ON".
         While set to "Ad. ON" mean the auto dim active , the display will auto dark around 9 seconds after stop operate the unit , only a little dot as the power led on the display.
        While set to "Ad. OFF" mean the auto dim disable , the display will always light.

Display inform:
         Leftmost on top mean the gain step number, from 1 to 9, 9 is the max gain.
        Left 2nd and 3rd on top mean the volume level, from 0 to 99, 99 is the max volume .
         Left 1st on bottom mean the input channel number , 3rd ,4th and 5th on bottom mean the input channel name, it may change either BAL (balance) and RCA (Single-ended).



The different between Single Ended and Balanced��
          The single ended version mean the product has built in two channel amps for Left and Right signal process.
          The balanced version mean the product has built in four channel amps for Left and Right balanced signal process.
          While I design and adjust, the balanced version in the full balanced system, can improve the transparency and sound stage on sound quality, so for kept the best musical, the four channel amps had separate total.
          Based on this design, while the balanced version connect the balanced sources, it can output full balanced signal and single ended signal, while it connect the single ended source, the power amp can connect XLR output socket but the hot output is without signal.
          For more fun to the user of full balanced system, face to the front plate, the outside XLR output sockets only have the hot signal output (mean single ended)  , the inside XLR output sockets have the full balanced output, user can through the same XLR cable to experience the different sound flavor between full balanced and single ended.


User tweak the sound flavor (We don't recommend user swap the tubes unless user has very good skill )：
          User can swap the tube A and B to get the different sound flavor, before swap, must mark the sign on the tube .