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If you want to purchase, please send the address, tel. number , name  to audio-gd@vip.163.com ,We will quote for you in short time.

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R2R 11
Single Ended Discrete Ladder Headphone amp / DAC (DSD native / DXD / PCM)

NOS design with
R-2R resistor ladders DAC+Headamp

Built in 2 groups DA-8 R-2R modules

Unique noise reject technology remove the artifacts
DSD , DXD support from USB
Amanero Combo 384 USB interface

All parts soldering with silver tin All resistors are the KOA / Vishay, no upgrade options

Price:     USD350 (Exclude shipping cost)

    

     
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Click to read the Amanero combo 384

Audio-gd products are design and tested based on the AP SYS-2722 specifications (The top-drawer professional equipment in world) 




SUMMARY
•Discrete DAC single ended headphone- and preamplifier
•True NOS , R-2R discrete ladder DAC
•Built in pre- and headhpone amp
•Built in 2 groups DA-8 R-2R modules with high speed CPLD correction
•Unique noise process technology will remove any digital artifact
•DSD native , DXD, PCM up to 384KHz Support
•Amanero Combo 384 USB interface
•Soldered with silver tin for all parts on board
•High quality ALPS 27 volume potentiometer

INPUTS
1.USB input.
2.Toslink optical SPDIF
3.RCA coaxial SPDIF


OUTPUTS
•RCA single ended (Output is configurable: fixed or variable)
•Headphone 6,3mm jack

Pros and cons of R-2R DAC  :

Advantages:
         1.R-2R will not convert the clock signal into the output signal.
         2. R-2R is not sensitive to jitter while Delta-Sigma DA is much more sensitive to jitter.
         3. The output signal is much more precise compared to Delta-Sigma DA .
Weaknesses:
        1.THD today is extremely good with Sigma Delta chips; R2R ladders are good too but not as good.
        2. Glitches and accuracy of the ladder resistors are very difficult to avoid and require complex technology to resolve it.

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R2R 11 CHARACTERISTICS
•R2R-11 are a breakthrough of discrete R-2R designed ladder dacs. Audio-GD are first in the market offering high performance discrete R2R in this price-range.


•Two pcs DA 8 modules equipped with ultra-high speed CPLD processors to correct the discrete resistor ladder. Unique parallel processing to achieve superb performance .

•Analogue section design based on Audio-GDs ACSS current driven technology, fully discrete transistors amplifiers.

•Double stages ultra-low noise high speed power supplies offers a musical and black background and favorable transparency .

•Built in Amanero combo 384 USB interface. Amanero offers satisfying and compatibility and marvelous sound quality.

•True NOS design. NOS is less sensitive to jitter and offering neutral sound. To avoid the digital artifacts, a uniquely designed noise rejection processing technology is applied.

•Native DSD support. no switch applied between the DSD and PCM decoder outputs for avoid effect on sound quality but had not obvious switch pop sound appear .

•Built with purity components: all resistors  are KOA / Vishay low  tolerance resistors  , silver tin soldering for all parts on board and ALPS 27 volume potentiometer .

•Option to set Neutral or Warm sound (Jumper setting) according to personal taste.


Sound flavor different between R2R 11 and NFB-11:
 
          They are not which is better but most different on the flavor and worth own both just like you own some different headphones.
           NFB-11 sound detail, dynamic, control but not bright and hash.
           R2R 11 had the  exotic sound quality! Smooth, coherent and analogue, it had not emphasize anythings but had not miss.
         

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