audio-gd Stellar product

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Master-1
Real Balanced ACSS Pure Class A Preamp

Price: USD1280

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Technology Detail

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The unit applied input short design :
         The unit had design the analog idle input short circuit for avoid the disturb between different sources.
         This design also applied in a lot high end brand devices.
         The working theory : Without the idle input short circuit ,if the input 5 and input 4 had connect two extra DACs, while users select the either input 5 and input 4 , the another input signal will fire through the circuits and mix into the using signal, even though this signal is weak but still can degrade on the sound quality.
          With the idle input short circuit function : if user select either the input 5 and input 4, the another input signal will short circuit then no any signal fire through circuits , can keep the sound quality had not degrade.
         Below case users don't want the idle input short circuit function, please make the custom order :
        1, The same extra source not only connect the unit analog input, but connect with other amps simultaneity.
        2, The same extra source connect to the unit different inputs at simultaneity.

Master 1 can compatible with KRELL amplifiers .
It need an adapt signal cable, one side connect to Master 1 ACSS output, another side connect to KRELL amplifier CAST input .
The ACSS output pins define:
Pin 1, GND
Pin 2, Hot
Pin 3, Cold
The KRELL amplifiers had lower gain than audio-gd Master series amplifiers while CAST connect , so customers can custom order the Master 1 have higher ACSS output gain if expect connect to KRELL amplifiers .
　

How to choose the settings in Master-1 :
    With the Master-1, the user has a choice of 70 steps ( Linear characteristic ) and 99 steps ( Exponent characteristic) of volume control, and you can also choose whether to have volume memory.
1. Choose 70/99 steps volume control:
Step A: Push out the "Debug" switch.
Step B: The display shows as pictures below.
Step C: Push the volume button, choose between 70 or 99 on right.
Step D: Push in the "Debug" switch.
           70 step volume control              99 step volume control

2. Choose volume memory:
Step A: Push out the "Debug" switch.
Step B: Push the selector button; the display shows as pictures below.
Step C: Push the volume button, choose display "ON" or "OF" on left.
Step D: Push in the "Debug" switch.
          Volume memory active.                 Volume memory off.