睿志音响

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NOS-1704 (Limit) Dedicated Discrete Diamond Difference design DAC NOS design applied up to 192K support 4pcs PCM1704UK (two-two parallel connect) Price: USD859 (Exclude shipping cost) (Default install DIR9001 for SPDIF input support up to 24bit / 96KHz, if customer want support up to 192KHz, while place the order inform free replace by CS8416 .)	24Bit 192KHz USB-SPDIF convertor price USD40 .
		The USB-SPDIF convertor place on outside, connect to computer, SPDIF connect to NOS-1704 input for implement USB playback. Driver download: Download TE8802 driver V2.0 (For Windows) Download TE8802 driver V1.1 for mac

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          It is close the PCM1704UK chips out of stock, so we design the NOS-1704 as the final version musical DAC built in PCM1704UK .
         The NOS-1704 had applied the NOS + Diamond Difference combo design which is had consider the best musical designs.
         NOS mean Non OverSample technology, It is easy to implement but difficult to achieve the good state , without the oversampling digital filter cause the DAC difficult to reproduce a dark background . Some designs cut a lot high frequency signal in analog parts to reduce the noise, but lost the detail and have unacceptable phase distortion .
         15 years ago we start build NOS DACs, we have build some lot different NOS DACs , the popular design with TDA1541, TDA1543 sound too warm but lost detail .
         The NOS-1704 sound not very warm but smooth , have not lose detail and reduce dynamic, the most important is it still have dark background .
         While you decide place the order please ensure you know the NOS DAC characteristics.

Fully discrete Diamond Difference design , without any OPA and couple caps in the signal channels. High working voltage (+/-35VDC) class A design .
Uses R-core transformer .
More than 20,000uf audio grade NOVER capacitors are used to ensure ample and smooth power feed.
A total of 4 groups class A PSU and 4 groups linear PSU are used to purify the power supply. To achieve high S/N, the control circuit is powered with separate regulator.
Uses most Hi-end grade parts and exact match transistors.
High / Low output level select .
5 groups digital input : coaxial *2 / Optical *2 / BNC*1
DAC output : RCA*3

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 writed 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.
　