Audio-GD C-2 (11th Anniversary Edition) Headphone Amplifier/ Preamp

    Audio-GD C-2 (11th Anniversary Edition) Headphone Amplifier/ Preamp

    RM 2,263.21

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    Product ID : 204149680 Brand : Audio-GD Model / SKU : C-2 (11th Anniversary Edition) Conditions : New

    Audio-GD C-2 (11th Anniversary Edition) Headphone Amplifier/ Preamp

    Hai Wei
    ** Facebook http://m.me/StarsPickerAudio
    ** WhatsApp https://goo.gl/GsPFak

    We are authorized agent of Audio-GD products in Malaysia. Products come with 10 years warranty. We will bear the postage for warranty claim for the first year. Price quoted, including postage to West Malaysia and import tax. For East Malaysia customers, please refer to the additional postage stated. 
    Should you need any advice on custom option, please kindly contact us. 

    Demo unit of Master 9 Pre-Amp/ headphone amp is available for audition at Kota Damansara outlet. Welcome to pay us a visit. 

    C-2 ( 11th Anniversary Edition )

    The single ended design based on Master 9
    Class A PSUs built in
    Discrete  Headphone amplifier / Preamplifier
    3000mW at 25 ohm (Class A )
    8000mW at 40 ohm
    OCC and hi-end parts applied 



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

    Different to the NFB-1AMP:
    The C-2 is a single ended  headamp and preamp (+/- 30V DC high voltage power supply ), The NFB-1AMP is balance  headamp and preamp (+/-15V DC power supply ).  So They had same output power specs can drive most headphone as well.
    If customer like to keep your headphone with single ended connector (6.3MM), choice the C-2 get better performance than the NFB-1AMP.
    If customer had the balance connector headphone or can modify the headphone with balance connector, choice the NFB-1AMP.

    Class A design built by discrete analog stages without any OPA or coupling caps in the signal channels.
    Non- feedback ACSS and output stage designs just same as our top grade Master 9
    Total applied 4 pcs exact matching 150W  transistors  as the pure class A output stages
    3000MW at 25 ohm Pure Class A   ,drive most headphones can working under pure class A state, 8000mW at 40 ohm max output, no matter with the low sensitivity headphones
    +/- 35V DC high voltage power supply built in, Class A  PSU's for  DC supply. 
    Uses most Hi-end grade parts and exactly matched transistors, OCC wires.
    100 steps digitally controlled relay-based volume control avoids channel imbalance and improves sound quality .
    Supper Exponential Volume Characteristic,  easy match the volume with very high sensitivity headphones and speakers 
    10 DB and 19DB gain can drive the high and low sensitivity headphones
    5 groups input:  RCA X4, ACSS X1
    Preamp output :   RCA / RCA / ACSS

    Headphone amp output:    4pins XLR X1 /  6.3MM X1 
    Static storage mode control software for avoid disturb sound quality , the MCU output once control data and save in the perform parts ,then stop output data until users next operation.


    Technology detail 

    Detail of the Current Conveyor (ACSS) Technology

    Impedance matching:
                 There are a lot different DACs in worth, they had different design and output impedance . For avoid the sound quality effect by different DAC's output impedance, in the C-2, it had design a pair single-ended class A FET buffers in the input . All the RCA input signals through these FET buffers, the output impedance had become very low, even the source had high or low output impedance. 
                 The FET buffers working on pure class A state, and it is so short signal journey , it can keep the sound quality without coloration ,dry and harsh .

                 C-2 had the same ACSS design with our top grade model Master 9 . It is a pure class A design built by discrete analog stages without any OPA or coupling caps in the signal channels.
                 They seem complex , but in fact they are the most simple design the world has ever had , their a lot components to process the power supply. The simplest and shortest signal journey brings out the most neutral and least colored sound.

                The ACSS is a non-feedback technology made with discrete amplifiers. Most people know the global feedback design can offer better specs in test measurements, and 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.
                All signal gain is in current area, all transistors work in pure class A mode.
                The C-2 has all components  exactly matched before installation.

                 Super low THD (Test by AP SYS-2722,0DBV output level)      Flat frequency response (Test by AP SYS-2722)

    Strong class A output stages:
                 The C-2 had design a pare diamond difference output stages, every parts had exact matching before assemble so don't need any human adjustment .  
                 The output stages had  two pair 150W transistors offer 3000MW at 25 ohm  Class A   ,drive most headphones can working under pure class A state, 8000mW at 40 ohm max output, no matter with the low sensitivity headphones


    Power supply:     

               The class A parallel connection PSU has very high input impedance to avoid pulse through the PSU from affecting the preamp and low output impedance with very fast speed and high linear, so it is a very clean power supply.
                The C-2 applies seperate linear PSUs for the display and control parts, avoid the disturbances through power line from affecting the amplifier.


    Volume control:
               The volume control is also different from conventional technology. Conventional volume control technology is the volume control implement in the analog amp input stage through a volume pot to reduce the signal  . The volume pots quality effect the sound quality direct , the low quality volume pot cause lost the detail and channels imbalance cause the soundstage distortion  . Even the high performance volume pot still cause the detail lose. Whatever quality volume pots, must cause the S/N worst .
               But in the C-2 , we applied the I/V conversion volume control , the volume control just  a variable passive I/V conversion place at the ACSS amp output , where the output is the current signal, not the voltage signal. The volume control is I/V conversion, and the volume depends on the current (I) conversion to the voltage (V). (Like R-2R D/A chips output passive I/V conversion)  It can keep the signal frequency band flat and not lost any detail. It can't degrade on sound quality in every volume level . After the volume , there are four groups  diamond non-feedback buffer output stages offer the very low output impedance  .
                Mark Levinson also knows that current volume control has great benefits, so in their Top End preamp NO.32 volume control, they use many components to change the signal to current signal (I), then implement the volume control , and then change back to voltage signal (V) again. 
                But C-2 is simply a more complete work in terms of the current signal, and technically, it is superior to conventional technology. 
    The less conversion bring much neutral sound .
                In C-2 is applied a  digital control relays based volume control. .C-2 has total two channels through changing the DALE resistors to control the volume for avoid channels imbalanced ,achieve the best performance and sound quality of the gear.
               C-2 have 100 steps volume control,  very smooth control  for  both high / low sensitivity headphone and speakers. While users change the volume, the 
    combine relays break or close, it may had slightly switch sound on output and disappear while stop change the volume.
                  C-2 Supper two sets Exponential volume characteristic  

    Static storage mode control software:
              In most control softwares design, the MCU will continuously output data to the perform parts , the MCU had the very high speed, so the output data become high frequency impulses disturb the audio signal circuits make the sound worst .  This product had applied static storage mode control software  , the MCU output once control data and save in the perform parts while just power on and users operate  ,then stop output data until users next operation. This design make the sound quality improve on the clear and transparency .


             The C-2 design had not compromise , it's built by full aluminum chassis, the transformer interference can't through the aluminum chassis transfer to the analog amps, and there are two shield boards for insulate the transformer and the power supplies.

          Uses all Hi-end grade components, including DALE resistors, WIMA caps, custom order NOVER (UK brand) caps.



    Font plate functions introduce:

    HP/PRE button : 
              Select the C-2 output model  , display "H" mean for headphone output, display " P" mean for preamp output.

    Gain button :  
              Select the Fast / Slow volume control characteristics.
              H: Fast increase the volume , 64 steps in total (0-63).
              L: Slow increase the volume ,100 steps in total (0-99).

    Input button : 
              Select the C-2 inputs from IN 1 to IN 5.

    Volume Knob: 
              Select the C-2 volume control .


    Two sets Exponential Volume Characteristic

    Discontinued the analog idle input short circuit function:
             The unit  had design the analog idle input short circuit for avoid the disturb between different sources.
             This design also applied in a lot high end 
    brand devices.
             The working theory :  
    Without the idle input short circuit ,if the input 5 and input 4 had connect two extra DACs,  while users select the either input 5 and input 4 , the another input signal will fire through the circuits and mix  into the using signal, even though this signal is  weak  but still can degrade on the sound quality.
              With the idle input short circuit function : if user select either the input 5 and input 4, the another input signal will short circuit then no any signal fire through circuits , can keep the sound quality had not degrade.
           Below case users want to discontinued the idle input short circuit function, pull off the 4 jumpers as mark on the photo:
          1, The same extra source not only connect the 
    unit analog input, but connect with other amps simultaneity. 
          2, The same extra source connect to the 
    unit different inputs  at simultaneity.


    Setting the C-2 have 19DB gain :
             Default the C-2  had 10DB gain, it is enough for most headphones . If the sources had low voltage level output or the headphone had had very low sensitivity, user can push into 2 pcs jumpers in the C-2 to boost the gain up to 19DB . (Please pull out the power cord before the cover of the chassis is taken off .)


    Setting the C-2 have warmer sound:
            The two different settings  for setting the C-2 have warmer sound. Push into 2 or 4 pc jumpers let they active .
            The warmer 1 setting can effect the sound become warmer for the 4 group RCA inputs .
            The warmer 2 setting can effect the sound become warmer for all inputs .
    sers can setting both to let the sound more warmer . 
    (Please pull out the power cord before the cover of the chassis is taken off .)


    The display auto dark :  Push into the jumper is auto dark .Please operate the jumper while the unit power off .

    Improvement may result in changes in specifications and
    design without notice.

    S/N Ratio
    >125DB (Volume minimum)

    <0.002 % 


    Low Gain : +10 DB 
    High Gain : +19DB

    Volume characteristic

    Two sets Exponential Volume Characteristic

    Headphone amp Output Power
     ( Pure Class A )

    25 ohm:   3000MW
    40 ohm:   2000MW
    100 ohm: 900MW
    300 ohm: 300MW
    600 ohm:   150MW
    Headphone amp Output Power
     ( Max  )
    25 ohm:   9900MW
    40 ohm:   8000MW
    100 ohm: 3500MW
    300 ohm: 1200MW
    600 ohm:   600MW

     Preamp Output Level (Max)

    10V @ RCA
    2.4MA @ ACSS

    Output impedance

    1 ohm

    Input impedance

    47K ohm @ RCA
    <10 ohm @ ACSS

    Frequency Breadth (XLR input)

    20Hz - 20KHz ( +/- 0DB )
    1Hz - 220K (+0DB, -3DB)

    Channels cross
    > 120DB

    Channels imbalance
    < 0.05DB

    Power Requirement

    1 Version  100-120V  AC 50/60 Hz
    2 Version  220-240V  AC 50/60 Hz

    Power Consumption

    30W @240V or 120V

    Package Weight

    Approximately 5KG

    Approximately W240 X L360 X H80 (MM, Fully aluminium ) 


    Power cord  X1

    Custom order options:

    1,  Custom order the 6.3MM output replace the 4 pins headphone output .
    The C-2 default had one 6.3MM and one 4 pins headphone output sockets, if users don't want the 4 pins headphone output socket can custom order replay by another 6.3MM socket.

    2, Custom order High Gain model for the HE6 and low sensitivity headphones:
          The C-2 default had 10DB gain, and it can setting to 19DB gain for RCA inputs inside .customers can custom order extra +3 to +9 DB gain with 4 workdays leadtime. If connect with other high sensitivity headphones like over 115DB sensitivity , may turn few steps volume but had quite loud .
          +3DB extra gain, total +13DB ( can setting to 22DB gain for RCA inputs inside ).
          +6DB extra gain, total +16DB  ( can setting to 25DB gain for RCA inputs inside ).
          +9DB extra gain, total +19DB  ( can setting to 28DB gain for RCA inputs inside ).

    Last Updated @ 7/15/2017 3:24:51 PM

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