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Audio-GD - Master 9 (Balanced Discrete Headphone & Preamplifier)

Common price: € 2.039,00 Our price: € 1.699,00 (€ 1.404,13 excl VAT)
Audio-GD -- ACSS Analogue balanced interlink (mini-xlr)Information
Audio-GD -- Analogue RCA interlink stereo pair (1m)Information
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  • Description
  • Specifications

Audio-GD - MASTER 9 (True Balanced Discrete Headphone & Preamplifier)

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 9 applies ultra-low distortion single stage ACSS amplifier and soldered directly on the motherboard. It is a fully class A preamp / headphone amp and applies class A power supplies.

Note:  MASTER 9 can work with all sources and power amps worldwide, but its ACSS output is compatible with Audio-GD Master series power amps.

Click here to read about our unique and special Black Edition option

  • MASTER-9 has ultra high fidelity; its SQ is completely neutral. It can show how good or how bad a recording or source is.

  • A cable is available to connect Master-9 ACSS outputs to a KRELL CAST amplifier input. KRELL amplifiers have lower gain versus audio-gd Master series amplifiers when using the CAST connection, so customers can custom order the Master 1 to have higher ACSS output gain if expecting to connect to KRELL amplifiers.

  • Fully balanced pure class A design built by discrete analog stages without any OPA or coupling caps in the signal channels.
  • Non- feedback ACSS analog output stage.
  • Total applied 12 pcs exact matching 150W transistors ( In total 1800W ) as the output stages and PSU stages for implement large class A output power .
  • Uses three R-core transformers (In total 135W ) separate power supplies for the digital control components, right and left channels.
  • More than 55,000uf audio grade NOVER capacitors are used to ensure ample and smooth power delivery.
  • A total of 9 groups of PSU's for dedicated DC supply.
  • Uses most Hi-end grade parts and exactly matched transistors, OCC wires.
  • Four-channel 100 steps digitally controlled relay-based volume control avoids channel imbalance and improves sound quality .
  • Supper Exponential Volume Characteristic, easy match the volume with very high headphone / speaker without change the gain mode.
  • 20dB gain can drive the low sensitivity headphone very well.
  • Static storage mode control software for avoid disturb sound quality , the MCU output once control data and save in the perform parts ,then stop output data until users next operation


  • 1. XLR balanced
  • 2. RCA single ended
  • 3. XLR balanced
  • 4. RCA single ended
  • 5. ACSS balanced

  • Preamp / DAC output :   XLR / RCA / ACSS (variable)
  • Headphone output : 4 pins XLR / 6.3MM SE 

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Weight: 16 kg
Width: 430 mm
Length: 430 mm
Height: 93 mm
Brand: Audio-GDAudio-GD


>130DB (Input short, XLR mode)
0.002 %
1 Ohm on all outputs
0.775 V RMS @ RCA 1.55V RMS @ XLR 2mA RMS @ ACSS
20Hz - 20KHz ( +/- 0DB ) 1Hz - 220K (+0DB, -3DB)
100 steps Super Exponential Volume Characteristic
10V @ RCA | 20V @ XLR
4.8MA @ ACSS
20V Balanced
Balanced: 40 ohm: 2500MW 100 ohm: 1050MW 300 ohm: 350MW 600 ohm: 175MW
55W @240V or 120V
W430 X L430 X H93 (MM, Fully aluminium )
Remote Control
IEC Power Cord
Image Product Price
Audio-GD - Master 2H (Balanced Discrete Power Mono Amplifiers) € 4.199,00 (€ 3.470,25 excl VAT) In stock Choose options
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