睿志音响

	Wisdom in mind, enthusiasm at heart.

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 ) :
          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.
　

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.