AUDIO-GD MASTER 2A Class-A Balanced Dual Mono Amplifier ACSS 2x 300W / 4 Ohm

AUDIO-GD MASTER 2A
Balanced double mono pure class A amplifier with ACSS and XLR input. Oversized power supply stage with 4x transformers and rejection of input current variations.

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AUDIO-GD MASTER-2A

Power amplifier / Double Mono 2x300W / Balanced

Audio-GD MASTER-2H

An exceptional Double Mono Amplifier ...

Once again Audio-GD made a new technological masterpiece in the field of audio amplifiers. This double mono amplifier has a particularly well designed architecture and a formidable power reserve while compromising nothing on audio precision rendering.

The famous brand once again takes its formidable  HE-2-type output stage with this time a pure class A integration from end to end. This circuit renews ingenuity in its most accomplished form with extraordinary performances and deep, detailed sound. Each of the two mono blocks is able to develop up to 300W under 4 Ohm which is more than enough to sonorize a vast listening room.

Each product of the brand is scrupulously tested from all angles with one of the most efficient systems in the world: the Audio Analyzers 2700 Series from Audio Precision.

A clean and efficient connection

The MASTER-2A by Audio GD is made up of 2 separate blocks, and has a total of 4 analog inputs: 2x XLR and 2x ACSS. The outputs are of course on 2 speaker terminals and require nothing more than connecting your speakers for the whole installation to be ready. 

The result is simple: great musicality, thanks to exceptional dynamics and a rich sound that is extremely detailed in all respects.

The button on the back cover immediately switches from the XLR input to the ACSS input and allows the user to select the source directly from the device.

Audio-GD Master-2H

A formidable HiFi device

Class A Symmetrical / R-Core / ACSS / Double mono

This MASTER-2A is equipped with no less than 4 transformers including 2 R-Core for a total of 1800W, 260.000uF very high-end Nover capacitors, and 80 very high performance MJL1302 / 3281 transistors for the output stage .

This amplifier is also designed around a pure Class A discrete balanced input and gain stage, with separate Class A power supply for the left and right channels and no capacitors or AOPs on the signal path.

The output transistors work with a large quiescent current. The "Diamond Cross" output stage avoids crossover distortions while benefiting from all the qualities and inimitable audio rendering of the class A.

Audiophile grade components, including DALE resistors, WIMA capacitors, and NOVER electrolytics.

Audio-GD MASTER-2H
Class A

Pure class A power Amplifier

Class A has the particularity of having its active components always in conduction. The quiescent current remains higher than the output current, thus limiting the harmonic distortion. The signal coming out of the Master 2A is therefore of superior quality, due to the absence of this famous crossing distortion in sinusoids alternations.

ACSS Technologie

Audio-GD has its own technological signature, called ACSS for "Audio-GD Current Signal System".
This technology allows a simpler and more direct input stage, reducing distortion.
Thanks to the expertise and know-how of the firm, this technology offers a less colorful sound, more detailed, and unparalleled neutrality.

ACSS
Class A

DC offset filter

In the event of instability on the electrical network, the supply voltage may vary and cause vibrations of the toroidal transformers. This can drastically degrade the audio performance of an amplifier with such a power stage. To counteract this phenomenon, your Master 2A amplifier is equipped with a DC input filter capable of absorbing up to 1.2V of these voltage variations and effectively suppressing any disturbance originating from the electrical grid.

Measures

Click on a picture to enlarge

THD+N @ 10W 8 Ohm

THD sous 10W @ 8 Ohm

THD+N @ 25W 8 Ohm

THD sous 25W @ 8 Ohm

THD+N @ 50W 8 Ohm

THD sous 50W @ 8 Ohm
SpEcifications
Output power100W under 8 Ohm
300W under 4 Ohm
600W under 2 Ohm
Gain+26dB
Input sensitivity2.2V RMS (XLR) / 2mA RMS (ACSS)
Input impedanceXLR : 94 KOhm
ACSS: < 10 Ohm
Inputs2x XLR / 2x ACSS
Outputs2x Speaker terminals (banana plugs compatible)
Power Supply4 transformer, including 2 R-Core
S/NR 110dB
Misc
Consumption600W @ 230V
Weight70kg (both blocks)
Housing material100% Aluminum
ColorBlack
Dimensions340 x 260 x 450mm (each block)
Package2x Power cable (the manufacturer recommends using appropriate non-generic power cables for this product)
 
Data sheet
InputXLR
InputACSS
OutputSpeaker terminal
ColorBlack
ChannelDual Mono
ClassClass A / AB
Amplifier chipMOSFET
Power (W)300.0
 
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AUDIO-GD MASTER 2A Class-A Balanced Dual Mono Amplifier ACSS 2x 300W / 4 Ohm
Balanced double mono pure class A amplifier with ACSS and XLR input. Oversized power supply stage with 4x transformers and rejection of input...

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