The difference between 9i-806 and 9i-906:

           1:  9i-806 uses potentiometer  for volume contrl and 9i-906 uses Volume IC Muse72320+  OP Muse02

           2:  9i-806 use a smaller transformer than 9i-906.

           3:  9i-806 use some cheaper components than 9i-906.

1： Introduction:

       9i-806 "Little 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/15W.   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.

       For the best sound quality, a balanced input is highly recommended unless you only  have unbalance signal. 

      "Little Silver fox" has four output interfaces: 4 pin XLR balanced, 6.35 single X2 , 4.4 balanced as well as double 3 pin XLR balanced .

2： Operating instructions:

 
     "Little 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 the characteristics of the headphonet as well as sound quailty you hear . High resistance mode is recommended in most cases.

     If you use ultra-high sensitivity headphones such as earbuds, you may hear a slight noise. Don't worry, Silver Fox has 3 low gain modes for you to choose from. You can choose one of the low resistance 1-3 modes and the noise will be eliminated.

3： Performance parameters:

 
Power: 15W (30 Ω BTL, distortion 0.02%)

Frequency response: 20-20KHz (0.2db)

Net Weight: 6.9kg

GRoss Weight: 8.1kg