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Even though the PCM1704 PDF declare the PCM1704 support up to 96KHz / 24bit, highest word clock input is 768KHz.
In fact the PCM1704UK can support 192KHz / 24bit at 8X oversampling , the word clock input is 1.536MHz , as high as ESS9018.

SA-2 (Upgrade from Reference 9)
Dedicated Discrete Diamond Difference design  DAC
DSP inside
Built in 4 Pieces  PCM1704UK Support up to 192KHz
32bit / 384K Asynchronous Transfer  USB-32 Module
OCC wires applied

Price:  USD1550   (Exclude shipping cost)
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Click to read the USB-32 character                              USB-32 Introduce

What's new in the SA-2 ( Upgrade from Reference 9 )
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          The full new design DSP processor solder on the main board direct for best signal transfer and faster process data and clock , it have better jitter refuse performance .
           It support up to 32bit / 192KHz through USB and I2S input, 24bit / 192KHz through SPDIF inputs ( NOS, 2X , 4X and 8X oversampling support . ).
           It is a full new design concept  . The SPDIF inputs have applied specialty interface process the data, this is allow the best parameter design for different type SPDIF inputs.
           IN1 : BNC input ,up to 24bit / 96KHz support  .
           IN2: AES input,   up to 24bit / 192KHz support .
           IN3, RCA coaxial input,  up to 24bit / 192KHz support .
           IN4, optical input ,  up to 24bit / 96KHz support .
           IN5 , I2S input,  ,up to 32bit / 192KHz support  .
           IN6 , USB input,  ,up to 32bit / 192KHz support  . 

Fully  discrete Diamond Difference design , without any OPA and couple caps in the signal channels.
High working voltage (+/-35VDC) class A design .

Uses 3 units R-core transformer .
Total of 20 groups dedicated power circuits ( 11 groups of high-quality class A parallel connection PSU with dedicated DC supply double-stage PSU power supply for digital parts ,  8 groups discrete dedicated linear double-stage PSU power supply for analog parts  ) and more than 35,000uF caps  are used to purify the power supply.

Uses most Hi-end grade parts and exact match transistors.

6 groups digital input :
 BNC coaxial  / AES /  RCA coaxial / Optical / USB / I2S
output :
  RCA *3
USB Audio Class 2 High-speed Input from Windows / MAC / Linux
Supports High / full speed Asynchronous Transfer Mode up to 384K / 32Bit ability .
Resolutions support 16 / 24 / 32 Bit with sampling rate support 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz ( USB  )
      
Supports up to 24 Bit/192KHz ( SPDIF  )
The DSP digital processor can supports NOS, 2X, 4X and 8X oversampling customers setting.


Sound characteristic : Musical (coloration ) but detail , smooth but not too warm .

History of the Diamond Difference design :

         At July 2004, I registered the brand audio-gd ,  at September 2004, I published the first generation diamond difference design at the < Radio & TV> , the best popular  audio technology magazine in China . There were a lot DIYer call me even wrote letters to me discuss the circuit.          At November 2004 , the fist regular product of audio-gd , XA-100 power amp released. It had the good honor from customers , let audio-gd can stand and grow up. Before this amp, I already have 6 years experiences of built the Diamond Difference circuit .         At 2005,  the first regular DAC product  DAC-1 released,  a   TDA1541A with diamond difference output stages.
       At 2006 ,the RT-1 released ,  its sound adjusted based on a 300B tube amp.      At 2007 , the RT3 kit released for DIYers .         At 2008 , the DAC-3 released, built in 4 pcs PCM1704 with diamond difference design .
 
At 2009 ,the SA-300 balanced amp released .     At 2010, I design the dual TDA1541AS2 DAC for fun, we only sale 5 units to the return customers . A pair TDA1541AS2 now value USD800 in market . At 2011 is the Reference 8 and 9 released .
   

Some other products applied Diamond Difference design maybe can't list , like the C-2 SA, ROC-SA, SA-100.
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Feedback from users :

8th Jan,
Gabriel from Spain:

         Now it's beginning to burn in in the system but the first impressions are awesome.
         Resolution and focus are terrific compared to the Audiomeca Mephisto.

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