1： Introduction:
 

      9i-906 "silver fox" is a headphone power amplifier with high performance,  strong power supply and high current output.  It's circuit design is complex and perfect ,  4 pairs of  high-power British FET are used in output part , the output power is 30Ω/20W.   Ultra low sensitivity  headphones can also be driven with excellent audio performance.

      It has four output modes: Normal, Balanced(BTL), Virtual Ground(Active G) and Parallel, as well as three low resistance modes and one high resistance mode. A variety of headphones can be matched .

      It has two  balanced and two unbalanced inputs . Even if you input an unbalanced signal, the internal circuit will convert it into balanced signal .  Therefore, even if you input an unbalanced signal you will also get the maximum output power.

     "Silver fox" has four output interfaces: 4 pin XLR balanced, 6.35 single , 4.4 balanced as well as double 3 pin XLR balanced .

2： Operating instructions:
 
     "Silver fox" is a pure headphone Amp and the operation is very simple.   There are only several function keys:  power switch, input selection, output mode selection ,  high/low resistance selection.
 

      Long press the out key to switch between high and low resistance modes.  There are four kinds of headphone impedance options for choice :  high resistance, low resistance 1, 2 , 3.  You can selected any mode according to whether  you hear noise . High resistance mode is recommended in most cases.
 

3： Performance parameters:
 
Power: 20W (30 Ω BTL, distortion 0.02%)

Frequency response: 20-20KHz (0.2db)

Net Weight: 12kg

GRoss Weight: 13.7kg