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Master-1
Real Balanced ACSS Pure Class A Preamp

Price: USD1280 

                         

                     
Summarize Use Manual Specs Technology Detail Shipping Cost

Detail of the Current Conveyor Technology

Core:
             Master-1 is a true balanced design applying the newest ACSS design which can improve the XLR connection to sound as good as the ACSS connection. 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.
            Master-1 applies ultra-low distortion single stage ACSS amplifier and soldered directly on the motherboard. It is a fully class A preamp and applies class A power supplies.

            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, all transistors work in class A mode.
             The XLR /RCA output buffers are Non-feedback, for low impedance, we applied a two-stage parallel connection, the output impedance is only 10 ohms.
             Master-1 has all components of four channels exactly matched before installation.

Power supply:    
             Three special transformer are used to supply power separately for the audio and control circuit.
             Master-1 uses 8 groups of high-quality class A parallel connection PSU, four double-stages for dedicated DC 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.
             Master-1 applies two linear PSUs for the display and control parts, avoid the disturbances through power line from affecting the amplifier.

Input/Output:
            Master-1 can input not only XLR balanced signal or RCA unbalanced signal, but also the top-grade ACSS current signal. It can also output RCA signal, balanced XRL signal, ACSS current signal to the power amplifier. Using RCA input, Master-1 can convert to balanced ACSS signal and output real balance signal from XLR and ACSS.
            Master-1 can output RCA, XLR and ACSS at the same time.
            The input channels of Master-1 adopt separated shielding method. When switching, the idle signal lines linked to the equipment and the ground wire are completely disconnected. The idle input ports of the equipment are shielded. In that case, the sound quality won't be affected even with more connected equipment.
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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 Master-1 , 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  dual FET  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 Master-1 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 .
            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 Master-1 is applied a four channels digital control relays based volume control. .Master-1 has total four channels through changing the DALE resistors to control the volume for avoid channels imbalanced ,achieve the best performance and sound quality of the gear.
            Master-1 allow users select between 99 steps exponential characteristic volume control and 70 steps linear characteristic volume control, whatever volume control allow users smooth to control the volume level .
While change the volume, the different relays break or close, it may had slightly switch sound on output and disappear while stop change the volume.

Shield: 
           Master-1 has complete separation of left, right amplifier channels, power supply, and transformer.
           Master-1 uses heavyweight all-aluminum alloy chassis to prevent the eddy current of transformers from interfering on circuit board. 
           Master-1 applies optical couple isolation for the MCU and the control implementations to prevent the MCU affecting the audio parts.

Components:
           Uses all audiophile grade components, including DALE resistors, WIMA & SOLEN caps, custom order NOVER (UK brand) caps, all audiophile grade input & output sockets (Neutrik ) and gold IEC socket.Master-1 all parts of four channels had exact match before install.

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 .

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