9i-92SA (Second generation) DAC/headphone Amp/Pre Amp
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9i-92SA (Second generation) DAC/headphone Amp/Pre Amp

Based on the 9i-92sa "golden thrush" first generation, the second optimized the DAC output buffer and redesigned the earphone circuit and learned from some design of dsdac1.0. The audio performance has been significantly improved on the original basis.

At the same time, the process level and the appearance has been greatly improved, the height has been reduced. The voice style of the first generation has been widely recognized and is known as the representative model within 10000 yuan.

The second generation has made great progress in the purity and density of sound. At the same time it has maintained the outstanding characteristics of musicality like the first generation and has strong competitiveness.
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Product description

.        9i-92SA "Golden Thrush" dac / headphone amplifier / preamplifier is a desktop hifi product for headphone user. It integrates a variety of advanced technologies and solutions  such as USB isolation technology, dual AK4497 decoder chip, etc., the audio quality is excellent, especially the quality of its headphone amplifier is very good.  It can get very good effect in driving the mainstream headphones such as HD800S and T1-II.

       "Golden Thrush"  has many functions and performs well on the adaptability of the headphones. There are not only four types of output mode for adapting to a variety of headphones but also different output circuits for high and low impedance headphones. As a headphone hifi product, "Golden Thrush" is excellent both in performance and function.
       The 9i-92SA "Golden Thrush" consists of the following parts:
       1: USB interface. XMOS second generation XU208 + FPGA digital processing module is used, and isolation technology is used to isolate noise from the computer. Support for NativeDSD512  and PCM384 input.
       2: AK4118+ dual AK4497DAC. The SPDIF receiver has three interfaces: coaxial, optical, and AES, support  PCM 24bit/192KHz and DOP (DSD64) inputs.
       3: Headphone amplifier. It has 6.35 unbalanced interface and 4-core XLR balanced interface. It has four output mode: standard, balanced, virtual ground and parallel.
       4: Pre-amp consisting of discrete components. "Golden Thrush" can be used as a pre-amp, the input interface is RCA and XLR, with infrared remote control.
       5: Power supply and display system.


      The following is a block diagram of the 9i-92SA "Golden Thrush":


      The figure above shows that there are 4 mode for connecting the headphone . The sound of each mode has its own characteristics, and the difference is very obvious. This is a very useful  for the user to selecting the most suitable mode. Under normal conditions high-impedance and high-quality headphones are suitable for balanced output mode, in this mode  the headphones can fully be driven by powerful driving force. Some headphones that are easier to be driven ,you can use parallel or virtual ground mode  to drive them. Here, I would like to introduce what is the "virtual ground" mode.

      Under normal conditions  the positive terminal of the headphone cable should be connected to the positive output, and the negative terminal should be connected to the GND. If we connect the input terminal of   amplifier to GND, the output will get 0 level, which is the same level as GND. At this time, the negative terminal of the headphone is connected to this 0 level, which is equal to GND. However, this is not the real GND, but the simulated GND, which is "virtual GND". This kind of connection can get a more unique sound, and the actual listening experience is warmer and softer, suitable for listening to human voice or string. In short, the "virtual GND" mode provides users with an effective tuning method that increases adaptability and entertainment.
      The second generation of XMOS is the latest XMOS solution which is faster.Isolation technology enables blocking between the  computer and 9i-92SA, the ground wire is not connected, completely isolating noise  from the computer. This feature is very effective because there are a large number of switching power supplies inside the computer that generate a lot of noise, which can interfere with the analog circuit and degrade its performance. Isolating these noises can significantly improve the purity of the sound.
      The code inside the FPGA has several functions: data isolation management, clock distribution, and DOP decode.
      The LPF is a balanced structure and the opAmp uses LME49720, a high performance opAmp. The analog output section is a discrete device architecture that has been carefully tuned to correct the sound. The volume control chip is PGA2311 which controlled by MCU and the volume range is -70db~0db. Its common volume has been optimized, volume adjustment and listening habits are more coordinated and there are reliable protection measures.
      The headphone amplifier uses a current feedback circuit. The technology of headphone amplifier is actually simple and the key is  adjustment. Drawing on our extensive experience in hifi  systems  we have achieved very good results when designing the "Golden Thrush" headphone amplifier. It not only has strong driving ability  but also sound balance, clear and delicate, strong sense of space. You can listen for a long time as well as forget the existence of headphones, just like listening to the big system. The output transistor of the headphone amplifier uses an expensive central metal package transistor which is a guarantee of performance. Careful adjustment makes this "Iron Hat King" fully exert its advantages.
      The display is a customized VFD, the information displayed is complete, and the color matching is stable and beautiful.





                                                                                       Use of 9i-92SA

       9i-92SA is a DAC which with coaxial, optical, AES and other digital input interfaces, can be used  to upgrade CD player, or as an external DAC for digital players in your audio system. It has a volume adjustment function.
      It is a fully balanced pre-amp with one RCA/XLR input interface and one RCA/XLR output interface. Active speakers can be connected to it for building  hifi systems and desktop systems. You can also use it as a preamp to connect to your power amplifier to build a large hifi system.
      It is a pure headphone amplifier . It drives both high-impedance and low-impedance headphones with good musical expression.
      It is an advanced USB DAC with the second generation of XMOS. The driver is a customized version and is the best choice for pchifi players.
      The most common use of the 9i-92SA  : Connect this unit to your computer via a USB cable,the music data is transferred to the unit. USB supports DSD512/PCM384. Because the computer player is very compatible and powerful, it can play music in any format. 
      The 9i-92SA's headphone amplifier has good quality and can drive mainstream high-end headphones. Its two  output circuits enables it to adapt to  high-impedance and low-impedance headphones. For the output has four output modes  the 9i-92SA has good adaptability to various headphones. Whether it is a 600 ohm high-impedance headphone or a 30-ohm low-impedance earphone, it can be well adapted.






                               Performance parameter


       Maximum audio support specifications: Spdif input ----- PCM192

                                                                         USB input ----- DSD512 PCM384

      Dynamic range: 115dB

      Signal to noise ratio: 115dB (A weighting)

       Frequency response: ±0.4 dB (20-20KHz A weighting)

      THD+N : -107dB (fs=96KHz /10KHz A weighting)

      Pre-level gain: 4db (volume is 0db)

      Output power: 2.1W (33 ohms distortion 0.9%) 0.5W (600 ohms distortion 0.027%)

      Dimensions : 320mm * 100mm * 310mm (WHD)

      Power supply : AC 220V-230V 50-60HZ (Fuse specification: 6.3A)

      Net Weight   : 5.9kg

      Total Weight : 7.3kg

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