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Hai Wei (Mr. Lim)
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Audio-GD A1 | Real Balanced Bridge Output Power Amp (Non Negative Feedback ACSS)

SUMMARY:
Non- feedback ACSS analog amps.

Fully balanced bridge output design, the gain stages and pre-driver stages work in class A and are built with discrete analog stages without any OPA or coupling caps in the signal channels.

The Diamond Cross output stage design avoids "switch distortion" as good as class A amps.

2 group analog inputs: XLR / ACSS

Applies 8 pcs transistors in total 1200W Pcm. Supports 120W X2 (8 Ohms) output.

The capacitance of the whole machine reaches as high as 80,000 uF, Two transformers , Separate power supplies for the right and left channels.

Applies all audiophile grade components, including Vishay and KOA resistors, WIMA caps, custom order NOVER (UK brand) caps.

A1 is a true balanced design applying the newest ACSS design which can improved the XLR connection to sound as good as the ACSS connection. It seems 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 A1 power amp only has a single " voltage" gain stage to process signals, but works in ACSS mode so in fact it is a current gain stage instead of voltage gain stage, whereas normal OPA chips already include two or three voltage gain stages. The simplest and shortest signal journey brings out the most neutral and least colored sound.

A1 applies ultra-low distortion single stage ACSS amplifier and soldered directly on the motherboard . The gain stages and pre-driver stages working on class A .

The diamond cross output stage design can avoid "switch distortion" as good as the class A amp .

COMPONENTS
Uses all audiophile grade components, including Vishay and KOA resistors, WIMA caps, custom order NOVER (UK brand) caps, A1 has all transistors of four channels exact-matched before installation.

SPECIFICATIONS:
Improvement may result in changes in specifications and design without notice.
S/N Ratio: >110DB
THD: <0.0008% (XLR input,1W @ 8ohm output state)
Gain: +22 DB

Output:
>125W @ 8ohm
>200W @ 4ohm

Output Level (Max,RMS): 32V Max

Input sensitivity:
3V RMS @ XLR
2mA RMS @ ACSS
Input impedance:
94K ohm @ XLR
<10 ohm @ ACSS
Frequency Breadth:
20Hz - 20KHz ( -0.5DB,XLR input,1W @ 8ohm output state )
20Hz -50KHz (-3DB,XLR input,1W @ 8ohm output state)
Channels imbalance: < 0.01DB
Power Requirement:
Version 1: 220-240V
Version 2: 100-120V
Power Consumption: 50W static @230V
Package Weight: 13KG
Dimensions: W(360) H(80) D(3600). (MM, Fully aluminium )
Accessories: Power cord *1

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