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D-27   

(Dual ES9038Pro + FPGA Processor)

Discrete  DAC + Headphone amplifier / Preamplifier
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Built in FPGA processor , reject the jitter
DSD , DXD support from USB &I2S
Dual 32bit / 768K Sabre ES9038Pro
32bit / 384K Asynchronous Transfer Amanero Combo 384
9000mW at 40 ohm (Pure Class A, per channels )

Price:  (Exclude shipping cost )
D-27.28 : USD1399 (Dual ES9028 PRO)
D-27.38 : USD1599 (Dual ES9038 PRO + TCXOs built in)
Free  mini remote controller (not in warranty)
 
Metal remote price is USD50.





     

      
Summarize Use Manual Specs Custom Option Shipping Cost


Click to read the Amanero combo 384

The different between dual ES9038 Pro and single ES9038 Pro is large:
               
The different not only the DNR, but the dual ES9038 Pro working under mono mode, the channel crossing is improve and offer a larger and exact sound stage.

           Dual ESS9028 Pro, working under mono mode, its DNR had 3DB better than single ES9038 Pro .


The FPGA is important in the D-27:

               
The FPGA is Programmable Array Logic.
           Nowdays the FPGA had applied in a lot high end grade DACs, like the popular ROCKNA WAVEDREAM DAC.
           Its inside hardware construction can through the complex software to design and arrange, and it can upgrade through the software upgrade.
           While upgrade the firmware, just same as upgrade the hardware. The design is much flexibility , can improve on sound quality , addition the newest functions , and it can never become out of date.

What the FPGA duty  in the D-27:

               
1, Separate the data feed to dual ES9038 Pro for working in mono mode.
           2, Clock re-clock process and FIFO design for all inputs , the output data can exact synchronization with clock signal, reject jitter.
           3, Built in high performance SPDIF interface , give up the built in low performance SPDIF interface of the ES9038 Pro .

Full discrete output stages:

               
The signal last stage is the analog output stages, they can much effect the whole DAC sound quality.
           The output stages working after ES9038 pro, they are full discrete transistor built with hole parts but not SMD parts .
           The high speed ACSS amps as the signal gain and process, they are non feedback design and working with current signal , so the dual ES9038 pro output current signal can through the ACSS amp , don't like others design want to multiple conversion the signal between current and voltage.
           The output buffers are the pure class A design , built with 4 pcs 150W (in total 600W ) on every channels, to drive the most headphones with difficult .
           In total the output stages are working in pure class A state, and without any negative feedback for the most pure and real like sound reproduce.
           There are 4 pcs OPA built in as DC serve , so the DAC can working well without couple caps  and output the most neutral sound.


Heavy power supplies design:
               
 The DAC has 3 high quality low noise, low flux leakage, R-cores transformers.
            In total 130W power to supply all digital parts and the left and right analog boards.
            The digital parts DC power is distributed by 15 ultra high speed low noise PSUs, they are group became the double stages PSUs .
            The analog parts DC power is distributed by 4 groups PSUs ..All are pure class A low noise regulated power.
            This results in ultra-high speed and ultra-low noise performance. Clean and independent power for all different parts to achieve highest quality.

   

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 D-27 , 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  .
           The volume control quality is much important in the real balance gear . It must guarantee the four channels signal control exact to achieve the performance of the real balance gear .  If the cool and hot of the balance signal can't guarantee exact, the balance output will has large distortion cause the sound quality and performance even much worst than a single end gear waste the  balance gear  design and the cost.
            In D-27 is applied a four channels digital control relays based volume control. .D-27 has total four channels through changing the Vishay resistors to control the volume for avoid channels imbalanced ,achieve the best performance and sound quality of the gear.
           D-27 have 100 steps volume control, control range achieve 90DB (usually the steps volume ports, potentiometer volume port, relays base volume control all have around 70DB range  ), very smooth control range on first 50 steps , cooperate with 13DB high gain, so can very easy adjust the volume for  both high / low sensitivity headphone and speakers. While users change the volume, the different relays break or close, it may had slightly switch sound on output and disappear while stop change the volume.
          Supper Exponential volume characteristic      Volume steps comparison to normal volume knob       
                                                            

The overall arrangement :
               
The DAC had separate the digital, Left analog, Right analog and power transformers parts, every parts had separate by 5MM thick aluminum boards for avoid the interrupt of each others.
           The Left and Right analog parts had symmetric place beside the digital parts , keep the wires and distance in same , made the sound stage is better exact .


The sound quality adjust :
               
Some people may don't like the sound of ESS chips. They are consider the sound is like fake . We want to change this concept .
           At first we want to let the unit had full burn in, then adjust the parameter , layout and design  to boost the distortion in minimum . This is easy finished.
         Then we had to spend a long term to listen and compare the sound , adjust the parameters to change the Odd and even numbers distortion to let the sound life and like real.
         Finally the DAC may had not the minimum distortion but had the most neutral sound with life and real.

  

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