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R-28  
(2021 Version)

Fully Balance Discrete Transistors Headamp And Preampamps
All In One

Built in real balanced headphone amp max output power achieve 9500 mW that can drive most headphone easy.

 8 group fully discrete R-2R DA modules to combine into real balanced push/pull decoders.

4 group fully discrete real balanced DSD native decoders.

Fully discrete real balanced  current transmition design.

2 pc ultra high frequency 90/98 MHz Accusilicon 318B femtosecond clocks provide synchronous clock for whole unit without PLL up-frequency .

32bit / PCM384K /DSD512 asynchronous transfer Amanero 384 apply the FPGA synchronous clock.

The whole digital circuit built with 1 pc FPGA and 5 pc CPLD programmable chipsets to separate the different configured circuits for avoid interrupt, data process in parallel mode.

Support firmware update to improve on sound quality.

All digital process mode settings accessible by buttons on front  (No need  to open the chassis).
 

 

             
Please note: The product improve cause the inside or outside change without inform .
Summarize Use Manual Specs Custom Option Shipping Cost

Specifications tested by OS8 mode and already through sound tuned, we always improve for better real like , musical and analog sound ,
improvement may result in changes in specifications and
design without notice.
S/N Ratio
>120DB
 

THD+N
 
<0.01%

Gain
 

L mode : +12DB
H mode : +22DB
 

Volume characteristic
 
 

Channels imbalance
 
< 0.05DB
Frequency Breadth
20Hz - 20KHz  (< - 0.5DB)
 
 Output Level
 Headphone output : 19V RMS  (balance)

Preamp Variable output : 19V RMS (balance)

DAC Fixed output : 5 V RMS (balance)
 
Headphone amp output power level
(Only for  headphone over 15 ohms.)

Balanced mode


9500mW / 25 ohm
8000MW / 40 ohm
 3500MW / 100 ohm
1200MW / 300 ohm
600MW / 600 ohm

 


Output impedance
 
1 ohm /  Headphone output

5 ohm / DAC / Preamp output
Input Sensitivity
0.5 Vp-p(75 Ohms, Coaxial)
19 dBm (Optical)
 
Support Operate Systems (USB)
Windows, OSX, Linux, ISO
 
Support Sampling  
USB & IIS : 44.1kHz - 384kHz /32Bit DSD64-512
 Coaxial mode: 44.1kHz - 192kHz
Optical mode: 44.1kHz - 96kHz
Power Requirement
1 Version  100-120V  AC 50/60 Hz

2 Version  220-240V  AC 50/60 Hz
 
Power Consumption
35W
 
Package Weight
Approximately 8.5KG
 

Dimensions
 
W360 X L360 X H85(MM, Fully aluminium ) 
Accessories
AC power cord            X1
USB cable X1
 


 

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