AUDIO-GD MASTER 9 MK3 Balanced Headphone Amplifier / Preamplifier Pure Class A Silver

AUDIO-GD MASTER 9 MK3 Balanced Headphone Amplifier / Preamplifier Pure Class A New
With the Master 9 MK3, Audio-GD presents the latest version of its headphone preamplifier/amplifier. This model builds on the success of its predecessor, still being a dual mono Class A headphone amplifier. With this new iteration, Audio-GD has mainly worked on the miniaturisation of its amplifier, going from a 16kg model to a 7kg model, without making any concessions to the quality of sound reproduction.

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AUDIO-GD MASTER 9 MK3 Balanced Headphone Amplifier / Preamplifier Pure Class A

AUDIO-GD MASTER 9 MK3 : Front view

With the Master 9 MK3, Audio-GD presents the latest version of its headphone amplifier/preamplifier. This model builds on the success of its predecessor, still being a dual mono Class A headphone amplifier. With this new iteration, Audio-GD has mainly worked on the miniaturisation of its amplifier, going from a 16kg model to a 7kg model, without making any concessions to the quality of sound reproduction.

Audio-GD Master 9 MK3 : Gain control

The Master 9 MK3 incorporates a gain adjustment function, making it easy to adapt to any type of headphone, even the most difficult to drive.
- The "L" (Low) mode has a gain of 16dB, making it suitable for powering headphones with a sensitivity of even more than 100dB, or for use as a preamplifier.
- The 'H' (High) mode has a gain of 25dB, enabling headphones with a sensitivity of between 80 and 100dB to be powered.

Audio-GD Master 9 MK3 : Quality power supply

The Master 9 MK3 has a dual mono architecture, so the right and left channels each benefit from an R-core transformer and 4 dedicated Class A power supply modules. The Class A modules used have a very high input impedance to prevent impurities from passing through the block and affecting the preamplifier, and a low output impedance, high speed and high linearity. The result is a very clean power supply with virtually no impact on the final sound reproduction.

AUDIO-GD MASTER 9 MK3 : Inside view

Audio-GD Master 9 MK3 : A design without compromise

The output stage uses a diamond structure for its circuit. This particular structure uses 4 transistors in a configuration reminiscent of a diamond crystal if represented schematically, it has the dual advantage of being fast and accepting high loads. Four 150W transistors are used per channel, operating in pure Class A. As a reminder, Class A amplification has the particularity of having its active components always in conduction. As a result, they amplify the input signal in its entirety, greatly limiting the total rate of harmonic distortion at the output. And so, thanks to its diamond structure and Class A operation, the Master 9 MK3 has signal processing that's both fast and distortion-free, for a result of rare quality.

Audio-GD Master 9 MK3 : Innovative volume control

The 100% discrete design of this amplifier (no OPA) is supported by a volume control that differs from conventional methods. Traditionally, volume control takes place in the input stage of the amplifier via a potentiometer to reduce the signal. The main problem with this method is that the quality of the potentiometer has a direct impact on the quality of the sound, which can easily lead to a loss of detail, channel imbalance or distortion that will later be amplified. So even with a quality potentiometer, its impact on the signal-to-noise ratio can be felt. To address this problem, Audio-GD uses an I/V converter located in the output stage of the Master 9 MK3. The task of this converter is to transform the signal current into voltage, so volume control depends on the conversion rate applied. This solution has a twofold advantage: firstly, it operates at the output stage, so has no impact on signal processing; secondly, the integrity of the original signal is preserved, since control is via a converter and not a resistor.

Audio-GD logo with ACSS mention

Audio-GD Master 9 MK3 : ACSS connectivity

Finally, the Master 9 MK3 is equipped with ACSS output. This is a proprietary technology of the brand called ACSS for Audio-GD Current System Signal. Thanks to the company's expertise and know-how, this technology offers a less coloured, more detailed sound with unrivalled neutrality. When the ACSS output is used, the XLR and RCA outputs switch to mute mode.

AUDIO-GD Master 9 MK3 remote control

The Master 9 MK3's remote control not only controls the preamplifier/headphone amplifier, but also an external Audio-GD DAC, if you wish to pair one with the Master MK3.

Audio-GD Master MK3 remote control
1Mute mode
2Preamplifier Auto dim
3Input source selection
4Gain
5Volume control
6DAC controls

Technical characteristics

Specifications
Product typeHeadphone Amplifier / Preamplifier
Inputs1x Stéréo RCA
2x XLR 3-pin stereo
1x ACSS stereo
Ouputs1x Stéréo RCA
1x XLR 3-pin stereo
1x ACSS stereo
1x Headphone output 6.3mm Jack
1x XLR 4-pin headphone output
Signal-to-noise ratio (SNR)> 130dB
Total harmonic distortion (THD)< 0.003%
Volume control100 step, exponentiel
Balanced headphone output power9000mW @ 40Ω
3800mW @ 100Ω
1250mW @ 300Ω
630mW @ 600Ω
Single ended headphone output power2500mW @ 40Ω
1050mW @ 100Ω
350mW @ 300Ω
175mW @ 600Ω
Preamplifier output level (max)RCA : 10V
XLR : 20V
ACSS : 2.4+2.4MA
Output impedance1Ω
Input impedanceXLR : 90KΩ
ACSS : < 10Ω
Frequency response20Hz - 20kHz @ +/-0dB
1Hz - 220kHz @ +0dB, -3dB)
Crosstalk> 130dB
GainLow Gain : +16 DB (XLR)
High Gain : +25DB (XLR)
General
Consumption45W
Weight7kg
Dimensions360 x 290 x 75mm
Housing materialAluminum
ColorSilver
Package1x Audio-GD Master 9 MK3
1x Power cable
1x Remote control
 
Data sheet
InputRCA
InputACSS
InputXLR
OutputRCA
OutputJack 6.35mm
OutputXLR
OutputACSS
ColorSilver
ClassClass A / AB
Remote ControlYes
 
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AUDIO-GD MASTER 9 MK3 Balanced Headphone Amplifier / Preamplifier Pure Class A
With the Master 9 MK3, Audio-GD presents the latest version of its headphone preamplifier/amplifier. This model builds on the success of its...

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