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Balanced Headphone Amplifier With Preamp output
Applies ACSS
Input: XLR X2 / RCA X2 /ACSS X1
Preamp Output: XLR X1 / RCA X1
HP amp output: 4PinsX1/3PinsX1/6.5mm X1

Price: USD1200 (Exclude shipping cost)
Weight: Approximately 16kg
Dimension:  W250 X L350 X H90(Per chassis)
Accessories: Stock power cable X1

Summarize: Fully discrete amp without any  , couple caps ,non- feedback analog output stage and non-feedback Class A power supplys .Use of LED display panel instead of the popular VFD display device, as VFD can cause disturbance in audio circuits.
       Applies all audiophile grade components, including DALE resistors, WIMA caps, custom order NOVER (UK brand) caps, all audiophile grade input & output sockets and gold IEC socket.

Sound Characteristics:  "A wire with gain".
       Neutral in my mind, is neutral and faithful-like, Phoenix doesn't have any particular character, like our other ACSS products, its sound depends on the source, Phoenix reveals to you the merits or shortcomings of your source. It only drives the HP, without coloration. I think, use of the word "neutral and faithful" will be better than the use of "neutral".
Feedback :


Please note:
All audio-gd products have change to new ACSS sockets as below ( expect the Master series ) , some photos maybe not update yet.



Illustrations on how to modify the headphone so that it can be connected to the Phoenix 4 pins HP amp output.
Click here to read:   modification

The parts of the headphone modification price is USD30, (includes one female 4 Pins plug and one male 4 Pins plug, some tapes and some WBT tin solder.)


About ACSS:
         ACSS (Audio-gd Current Signal System) is Audio-gd's system for transmitting audio signals in the current domain. This concept, first seen in 1966, we have used for many years, and since 2006, have evolved the technology to include all audio signals in our systems from the digital source to the power amplifier. Since 2005, ACSS comp5nts have become Audio-gd's most popular products.

Please Note:
    1, Before powering on the Phoenix, users must connect the DC power cables and data cable.
    2, Phoenix sound is neutral and faithful like (very neutral and less coloration, just as "a wire with gain"), its sound quality depends most on the quality of the source and recording, if the source or recording is not good, then the sound quality will not be good either. Please keep in mind and think about this aspect if neutral and faithful-like sound will suit your taste before you place an order for Phoenix.
    3, In Phoenix volume control, memory function is default (users can cancel the memory function), volume display 00" is the minimum volume. While using Phoenix for the first time, users must make sure that the volume is set on minimum.
    4, Because Phoenix applies aluminium feet, if users want to stack or touch gear side by side, don't let the feet 
and classis box, or two classis boxes, be in direct contact or joined without electrical insulation. Place a piece of paper or some other insulating material between gear, because the aluminum chassis and feet are conductive.@   

 The input/output of Phoenix:

   Phoenix has ample inputs and outputs, and includes two RCA inputs, two XLR inputs, and one ACSS input.
   When fed with an RCA signal, Phoenix can change the RCA signal to an exact XLR signal at first, then change to a current signal to feed ACSS modules.
   When fed with an XLR signal, Phoenix can re-proofread the XLR to make a complete mirror (exact) XLR signal, then change it to current signal to feed to ACSS modules. In cases where the source output XLR signal is not exact (Hot signal level not same with cool signal level's absolute value), through this re-proofread process, it can correct the signal to produce an exact XLR signal.
   In short, whatever the input might be, Phoenix will output XLR signal to Headphones, unless your headphone is plugged into the SE output socket.
     Phoenix has one 4 pins xlr and one set of 3 pins xlrs and one single-ended 6.5mm stereo socket as output.

 Design Features: 
The Phoenix applies ACSS (Current Audio Signal Transmission) technology. The heart of our ACSS technology is in the ultra low distortion BPM-7110 V2 module. The sound of Phoenix is neutral and faithful-like, very neutral and sounds exceptionally clear and transparent. Soundstage is precise, three-dimensional and huge, detailed and lifelike midrange, and transparent treble with tight and extended bass.

     Phoenix has five pairs of inputs: one pair of ACSS current mode input, two pairs of balanced inputs on XLRs and two single-ended inputs on RCAs. If the input signals are coming from XLRs and RCAs, they are internally converted into current signals and then amplified. To use the Phoenix as a preamplifier, there are 2 pairs of outputs, one XLR and one RCA for your power amp connections.

     In order to minimize interference, the left and right channel circuitries are completely separated from the digital LED display and controller modules to minimize distortion of sound quality. Three special transformers are used to supply power separately for the audio and control circuit. The signal amplifying section and the voltage and control section are separately installed in different chassis which further enhances the transparency of the tone to its peak. To achieve a perfect performance, Phoenix also applies the complex two-stage parallel-stabilized voltage supply to get a purer power supply so that a better sound quality is guaranteed. We are the first people in the world to apply and make use of the ACSS power supply.

     Phoenix uses a heavyweight all aluminum alloy chassis to prevent the eddy current of the transformer from interfering with the circuit board. Phoenix net-weight is 16KG. Furthermore, the interior is separated into 2 sections by aluminum boards for the best channel separation.

     All the sockets of Phoenix use Hi-End grade products, and it is sealed by WBT silver solder. Everything that we have done has been for better audio and sensational effect.

     The control function of Phoenix is very user friendly. The volume switch adopts IV method, which effectively decreases the effect on tone quality. The overall impedance is invariable, and the change of volume also applies in other ways. To lower the control circuit's interference on the audio circuit,
we have applied a high-speed optocoupler to separate control signals and executing sessions; in the same way that other sky-high priced imported equipment adopts to improve quality. When not operational, the control circuit is stopped and the control signal is temporarily stored in the memory, which also outputs direct current levels to control the executing session. This will effectively eliminate the detrimental effect caused by long-time data output of an ordinary control circuit.

     Phoenix has a memory function. It can independently memorize the status of the 5 input channel groups; and maintain them even when the machine is shut down. Unlike machines without a memory function, the input channel and volume do not need to be adjusted every time the machine is operated. This function brings a more convenient and pleasant way for users to enjoy music.

About volume in ACSS circuits:

 Phoenix use ACSS technology, which is very different from conventional technology.
 In conventional technology the gain is fixed, like 3DB or 6DB.

     But in ACSS technology the gain changes with volume, and when you turn off the volume, the gain is -80DB or -100DB (in conventional technology it can't work lower than 0DB).
     While you are listening in normal volume, the gain may be around -50DB, or between -80 to +12DB.
     The volume control is also different from conventional technology. Conventional technology volume control is placed in the input, and attenuates the signal.
     But in ACSS, it is placed at the ACSS modules 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 D/A chips output I/V conversion)
     As you can see, ACSS circuits have no gain, as it is a completely different circuit.
     The sound quality benefits from I/V conversion volume control. 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 through the R-2R network to control the volume, and then change back to voltage signal (V) again. But Phoenix is simply a more complete work in terms of the current signal, and technically, it is superior to conventional technology.
     ACSS is fully non-feedback with very low distortion, so sound is neutral (neutral and faithful) because it has no feedback effect.

How to choose the functions in Phoenix:
       With the Phoenix, the user has a choice of 70 steps and 99 steps of volume control, and you can also choose whether to have volume memory.
1. Choose 70/99 steps volume control:
Step A: Push in the "Debug" switch.
Step B: The display shows as pictures below.
Step C: Turn the volume knob; chooses between 70 or 99 volume steps display on right.
Step D: Push out the "Debug" switch.

           70 step volume control                      99 step volume control
2. Choose volume memory:
Step A: Push in the "Debug" switch.
Step B: Turn the selector knob; makes the display show as pictures below.
Step C: Turn the volume knob; choose between memory "ON" or "OF" on left.
Step D: Push off the "Debug" switch.

         Volume memory active.                          Volume memory off.


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

Head amp / Preamp
S/N Ratio
118db (Input Load 600 Ohms)
 Output Level
24V RMS (Max )
Output Power 25 ohm: 1000MW
62 ohm: 2500MW
100 ohm: 3000MW
300 ohm: 1800MW
600 ohm: 900MW
9DB (70 Steps Volume , XLR input)
15DB (99 Steps Volume , XLR input)
Volume Characteristic 70 steps Linearity
99 steps Exponential
Output Impedance
1.5 Ohms (HP amp)
Input Impedance
100K Ohms (XLR input)
Frequency Breadth
2Hz to 130KHz (ACSS input ,1V output level)
Power Requirement
1 Version  100-130V  AC 50/60 Hz
2 Version  200-260V  AC 50/60 Hz
Power Consumption
48W Class A
13KG (Without Accessories)
Package Weight
             DC power cord           X1 pair (50CM long)
Data cable          X1
Operating Temperatures
-10 XC to +80 XC
Operating Humidity
5 % to 90 % (without dew)



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