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Missing sound card section. If you are missing the Sound, video and game controllers category in Device Manager, your sound card drivers may not be installed properly. Your sound card may also be disabled, malfunctioning, or unavailable. First, verify no conflicts or other devices are present in the Device Manager. USB Sound Card, TechRise USB External Stereo Sound Adapter Splitter Converter with Volume Control for Windows and Mac, Plug & Play, No Drivers Needed 4.3 out of 5 stars 1,541 $12.99. We do not manufacture graphics cards, sound cards or modems. Your retail manufacturer is responsible for your product support. Please contact your manufacturer or visit your manufacturer's Web site for driver support. These generic drivers may have been modified by the electronics manufacturer to suit a particular product. Sound Card:the native Windows drivers won’t include all the extra sound features like virtual surround, etc. If you bought a PC, head to their site, if you built one, either go to the motherboard manufacturer’s site for onboard sound, or the sound card manufacturer’s web site otherwise. Sound card drivers and multimedia device drivers are available to be downloaded for free for the Soft32 site. Visit the site today to take advantage!

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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)

R2R 11 2019 version new upgraded:
Since 28th of Oct. 2018 ,the R2R 11 2019 version had released , it had upgraded to reduce the DSD noise had extra -14DB and keep the sound same with the older version. Now the DSD background noise level is similar to the popular OS design units , but R2R 11 is a NOS design.
Firmware updated
Since 28th of March 2018, R2R 11 includes new updated firmware .
The update removes the 'pop' sound while switching to the PCM music tracks.
The customers who bought unit after 28th March do not require firmware update.

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 450MHz ultra speed CPLD
•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
•Without any mute switches for keep the signal without degrade
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 design is not sensitive to jitter as Delta-Sigma D/A which is much more sensitive to jitter.
3. The output signal is much more precise compared to Delta-Sigma D/A
Weaknesses:
1.THD today is extremely low with Sigma Delta chips; R2R ladders have good THD but nos as good as Delta Sigma
2. Glitches and accuracy of the ladder resistors are very difficult to avoid and require complex technology to resolve it.

R2R 11 CHARACTERISTICS

•R2R-11 are a breakthrough of discrete R-2R designed ladder dac’s. Audio-GD is the 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-GD’s ACSS current driven technology, fully discrete transistors amplifiers.
•Double stages ultra-low noise high speed power supplies offers a musical and black background and transparency .
•Built in Amanero combo 384 USB interface. Amanero offers high sound quality and great format compability.
•True NOS design. NOS is less sensitive to jitter and offers neutral sound quality .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 to avoid negative effect on sound quality.
•Built with highest quality components: all resistors are KOA / Vishay low tolerance resistors , silver tin soldering for all parts on board and ALPS 27 volume potentiometer .

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You can chose between Neutral or Warm sound (Jumper setting) according to your personal taste.

Sound quality differencies between R2R 11 and NFB-11:
The differencies between those units are only in tonal quaities
NFB-11 sound is detail, dynamic, controled but not bright or hash.
R2R 11 has Smooth, coherent and analoguesound quality and has no emphasise on any frequencies in audio spectrum
E.g : You can image the NFB11.28 is like a highly defined digital photo but the R2R 11 is more like real oil painting.
If you are a new audiophile , you should go for the NFB11.28 over R2R 11, NFB11.28 has modern sound quality may better fit for new audiophile.