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Audio-GD NOS-19 Single Ended DAC (PCM1704)

RM 4,479.00
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ItemID
204149696
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International ,Ship By: Courier Services,Self Collect,Normal Post
Weight
5KG (kg or dimension)
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1000
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StarsPicker
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Item Specification
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  • Brand : Audio-GD
    Model / SKU : NOS-19
    Conditions : New

    Product Description


    Audio-GD NOS-19 Single Ended DAC (PCM1704)

    KINDLY PM FOR LATEST STOCK AVAILABILITY BEFORE MAKING PAYMENT
     
    Hai Wei
     
    ** Facebook http://m.me/StarsPickerAudio
     
    ** WhatsApp https://goo.gl/GsPFak

    NOS 19

    PCM1704UK & DSP built in
    32bit / 768K support 
    32bit / 384K Asynchronous Transfer  XMOS U208 Chip
    C
    lass A PSUs and Class A analog amps design

                      

              

          

     

    Xmos U8 Introduce and drivers download
    Amanero combo 384 Intruduce and driver download (For the unit with the Amanero Combo384 upgrade module)

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

    Reviews: 
    http://www.head-fi.org/t/806397/audio-gd-new-nos-7-2016-edition-impression-thread/60

    How to update the firmware

    Since Oct. 12th. 2016 , the unit had update the Ver 2 DSP software: 
              The Ver 2 DSP software had improve on the timing performance, hence can support high res music better and working better on high oversampling input, users can hear more better detail in sound quality . And the new software had addition the 3rd Nos mode for users choice for their favorite taste.

    What's new in the NOS 19: 
             The NOS 19 produced is based on a lot our older PCM1704 product users feedback . 
              A lot users feedback they like the NOS sound in the PCM1704 products, let me made the  decision to design a new software offer the better performance of the NOS mode.
              For the most real like sound reproduce, Mr.Kingwa had spend a long term to  design and rectify the new NOS DSP software personally, not only based the the software codes , but he  also well know on the hardware compatible and  sensitivity on the sound quality  . 
              In the design had applied -6db /oct passive analog filter , you can hear the wonderful sound of the NOS but you can't hear the noise as other some NOS design .
              100 people may had 99 type prefers . We had design two NOS modes in the software for users select.
              One is the best speed data process, another is applied large algorithm to process the data.
              The full new design concept had boost the PCM1704 support up to 768KHz even 1536KHz (test in emulation mode).
               A high exact TCXO for the DSP chip   running in the asynchronous data process mode, it don't want the source master clock input , which is reduce the signal transmit request, FIFO design and rebuilt the clock by the DSP chip, can refuse the jitter .       

               IN1 , USB input  ,up to 32bit / 384KHz support  . 
               IN2 , HDMI input ,up to 32bit / 384KHz support  . 
               IN3, RCA coaxial input,  up to 24bit /96KHz support .
               IN4, optical input , up to 24bit / 96KHz support .
              

    Different to the DAC 19: 
              The DAC 19 had the 8X times oversampling and NOS mode can be selection .
              The NOS 19 had the more advantage algorithm   than the NOS mode of the DAC 19 .
              The oversampling design and NOS design had different sound characteristic ,it is not which is better but depend on the customer's prefer.
             We can't exact explain the different in English, please search in web .


    Summarize
    Multi-ply shield boards to isolation the power input socket , transformer, power supplies, digital part and the analog part .
    Fully Discrete design built by discrete analog stages without any OPA and coupling caps in the signal channels .
    Non- feedback ACSS analog output stage 
    Large R-core transformers and Hi-fi grade parts like DALE resistors, WIMA caps and OCC wires .
    A total of 5 groups class A parallel mode PSU power supply for all digital and analog circuits.
    4 digital inputs:   USB / Optical / Coaxial /HDMI 
     
    Support up to 384K / 32 BIT through USB 
    Best sound SPDIF interface chip DIR9001 built in .
    DAC output:   RCA / ACSS 
     

    Below is the picture of the DSP input , was from the Amanero connect the macBook pro .


    And after the DSP process :


    Technology detail

    Detail of the Current Conveyor Technology
     

    Simple and short signal transfer is best:     
                  The NOS 19 is a fully  discrete design. Applies the 2 Pieces Expensive high-end grade PCM1704UK which can support up to  32 Bit / 192KHz through USB / I2S input . The  SPDIF input support up to 96K / 24 BIT because we had applied the best sound SPDIF receiver DIR9001 .  
                  Different  to other PCM1704UK designs , we applied Non-feedback ACSS analog stages. The  PCM1704UK feed to the ACSS analog stages without any OPAs and couple caps so it can avoid sound coloration .
           
                  The ACSS is a non-feedback technology made with fully discrete amplifiers. Most people know the global feedback design can offer better specs in test measurements, and classic non-feedback can't do well in test measurements but can offer better sound for the human's ears. Here is a conflict of the classic circuits. But the ACSS opens a new field, it can offer a least coloration sound which is more neutral with very low distortion and high linearity. So it can retain the dynamics, detail and neutral sound but not sound bright or harsh.
                  The ACSS circuit naturally working in current model and have design  current input , it can transfer the PCM1704UK current signal to output and implement the I/V conversion in current model in one ACSS amp . And this ACSS amp only have one current gain stage , the PCM1704UK output signal only through one stage can arrive the output stages .
                 The shortest signal journey can reproduce the best detail and dynamic, and almost without sound coloration , It can show the  real performance of the PCM1704UK .
                The output buffers are Non-feedback class A FET design.The output impedance only had 10 ohm .
     

    DSP-1 processor:
               For the most real like sound reproduce, Mr.Kingwa had spend a lot time to  design and rectify the new NOS DSP software personally, not only based the the software codes , but also had a lot audition on the sound quality  . 
              In the design had applied -6db /oct passive analog filter , you can hear the wonderful sound of the NOS but you can't hear the noise as other some NOS design .
              100 people may had 99 type prefers . We had design two NOS modes in the software for users select. Since Oct. 12th. 2016, the new Ver 2 software had offer 3 Nos modes .
              One is the best speed data process, another is applied large algorithm to process the data.
              The full new design concept had boost the PCM1704 support up to 768KHz even 1536KHz (test in emulation mode).
               A high exact TCXO for the DSP chip   running in the asynchronous data process mode, it don't want the source master clock input , which is reduce the signal transmit request, FIFO design and rebuilt the clock by the DSP chip, can refuse the jitter .       

    Power supply:
                NOS 19 applies the excellent 2 pcs PCM1704UK and excellent analog output stages, but these are not the only keys of the best sound. The power supply is most important. Even applying the best DA chip and the best amp, if matched to a normal power supply, the total sound may still be average or sound musical, but can't be neutral and detailed. That is why it is easy to find hi-end grade gears maybe without the best chips or amp stages, but with plenteous dedicated DC supply circuits. 
                The NOS 19  
    had total  Uses 5 groups of high-quality class A parallel connection PSU with dedicated DC supply double-stage PSU, which can offer very clear DC power for the DAC, producing a very black background and neutral sound characteristic. The double-stage PSU is very important for digital parts. Some designs may have very low jitter in theory, but if the power is supplied by a dirty or low-speed power supply, it will increase the jitter and pollute the data, and degrade the sound quality obviously.
                 The class A parallel connection PSU has very high input impedance to avoid pulse through the PSU from affecting the DAC and low output impedance with very fast speed and high linearity, so it is a very clean power supply. In my experience, its sound is better than battery power supply, better human sound and neutral.
            Diagram of the  Class A PSUs for analogy parts      Diagram of the Class A   PSUs for digital parts

                                  

    Built in Hi-End grade parts :
             
    NOS 19  have built in most high end grade parts, like the DALE resistors (USA), WIMA caps (Germany)  and NOVER parts (UK) . 
             These parts have through long term practices and consider have least sound coloration . 
             Built in high end grade parts have not warranty have the good  sound , but the best technology design with high end grade parts can have the high ended sound quality .

     

    Use Manual:

    Power button: 
    Power ON/Off the DAC.

    Setting button: 
    Select the phase of output signal  , pull off for the normal output, push into for invert output .

    Selector button:
    Select the input sources.   1: USB input. 2: HDMI . 3: C
    oaxial  input. 4 :  Optical input. (Please note : The version without HDMI, select both 2 and 3 are the coaxial input.)

    DSP-1 Jumpers setting


    The product shipping before Oct. 12th. 2016

    Jumpers Number

    Setting

    Functions describing

    Jumper1  PLLEN

    J1 (ON) ,J2(OFF) :PLL1 active
    J1 (OFF) ,J2(ON) : PLL 2 active
    J1 (OFF),J2(OFF) :    All PLL off
    J1(ON), J2(ON)    :    All PLL off

    PLL 1 setting for both NOS modes

    Jumper2  ATT0

    PLL 2 setting for  NOS mode 1 only

    Jumper4  IPS0

    J4 (ON) : NOS mode 2

    J4 (OFF) : NOS mode 1

    NOS modes selection

    Jumper5  IPS1

    J5 (ON) :Smoother

    J5 (OFF) : Neutral

    Sound flavor selection

    Jumper6  DITH

    J6 (ON) :Asynchronous mode2  active

    J6 (OFF) :Asynchronous mode1 active

    Asynchronous  mode selection


    The product shipping in or after Oct. 12th. 2016

    Jumpers Number

    Setting

    Functions describing

    Jumper1  PLLEN

    J1(ON), J2(ON)    :    PLL1 active
    J1 (ON) ,J2(OFF) : PLL2 active
    J1 (OFF) ,J2(ON) :    All PLL off
    J1 (OFF),J2(OFF) :    All PLL off

    PLL select for setting for all NOS modes

    Jumper2  ATT0

    Jumper3  ATT1

    J3 (ON) :Smoother

    J3 (OFF) : Neutral

    Sound flavor selection

    Jumper4  IPS0

    J4 (ON),J5 (ON) : NOS mode 1 
    J4 (ON),J5 (OFF) : NOS mode 3 
    J4 (OFF),J5 (ON) : NOS mode 2
    J4 (OFF),J5 (OFF) : NOS mode 1

    NOS modes selection

    Jumper5  IPS1

    Jumper6  DITH

    J6 (ON) :Asynchronous mode2  active

    J6 (OFF) :Asynchronous mode1 active

    Asynchronous  mode selection


    Note:     ON mean the jumper push on. 
                  OFF mean the jumper pull off. 
                  Before witch the jumper ,for avoid the people body if had the static electric will damage the chips in the unit.

     
    Specifications might subject to change without prior notice for product improvement.
    THD + N
    109dB (22Hz - 22KHz)
    (The NOS design had inborn worst specs than the Oversampling design )
    THD <0.0008% (20Hz-20KHz)
    (The NOS design had inborn worst specs than the Oversampling design )

    Output impedance
    10 ohm

    Output Level
    2.5V (RCA)
    2MA (ACSS)
    Input Sensitivity
    0.5 Vp-p(75 Ohms, Coaxial)
    19 dBm (Optical)
    USB1.0 / 1.1 / 2.0 / 3.0 (The USB speed lower than 2.0, support up to 96K )
    Frequency Response
    20Hz - 20KHz ( - 1DB)
    (The NOS design had inborn worst specs than the Oversampling design )

     

    Support Operate Systems (USB)


    Windows , OSX

    Support Sampling  
     USB and I2S modes: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz , 192kHz, 352kHz, 384kHz
     Coaxial and Optical mode: 44.1kHz, 48kHz, 88.2kHz, 96kHz
    Power Requirement


     Version 1: 100-130V  AC 50/60 Hz
    Version 2:  220-240V  AC 50/60 Hz

    Power Consumption
    16W
    Package Weight
    Approximately 5KG

    Dimensions
    W240 X L320 X H80 (MM, Fully aluminium ) 
    Accessories
    AC power cord            X1
    USB cable                X1

    Custom order options:

    1, Custom order two pair RCA outputs:
          If customers don't want ACSS output , it can be replaced by RCA output. 


    2,
     Upgrade to the Amanero combo384 USB module:
        
     Upgrade to the Amanero combo384 USB module for replace the USB32 ( Choice this upgrade option, customer don't want upgrade the TCXO for the USB ).


    Last Updated @ 7/15/2017 3:40:41 PM


      Buy with confidencewe have 908 Good Ratings from buyers !

    BuyerItem IDDateRatings
    ze**** 197277498 5/24/2018 8:09:00 PM Received item as advertised. Delivery was fast. You have to find out suitable program to use on your pc for playlist creation and export.
    su**** 192272629 5/17/2018 4:20:00 PM Fast delivery. Thumbs up!
    dr**** 202015630 5/8/2018 8:37:00 PM -
    bl**** 195704728 5/4/2018 9:47:00 PM -
    bl**** 195656612 5/4/2018 9:45:00 PM -
    lo**** 201449836 4/27/2018 9:33:00 PM Very good and friendly seller with much variety of item! Must visit their shop for superb environment and food.
    dr**** 201776746 4/21/2018 6:10:00 PM -
    ma**** 202370144 4/20/2018 2:19:00 PM Excellent seller.Wide variety of products  Responsive to question.Very fast delivery.Hope you sell aplenty





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    2. The warranty period begins to run as of the date when customers receive the product.

      Coverage of the Warranty

      1. The buyer is entitled to claim for warranty for damage to the product in transit, defect in workmanship of the product, delivery of a wrong item of product, or any other damage caused by reasons other than fault of the consumer, and all cost and expenses incurred for the shipment of the product will be borne by us.
      2. The warranty does not cover damage caused by human factors, accident, misuse of the product, unauthorized alternation to or change of parts or components of the product, act of God or problems of power supply.
      3. No warranty is offered for products which have gone beyond the period of warranty. We can arrange to send back the products for repair but any cost incur will be bear by customers.
      4. No warranty is offered if the warranty label on the product is altered or damaged.

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