Gustard H20 Balanced Headphone Ampsearch

Gustard H20 Balanced Headphone Amp

Gustard H20 Balanced Headphone Amp

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Extremely Powerful

A sequel to the popular H10, the Gustard H20 is a powerful class-A headphone amplifier with a variety of inputs and outputs. In fact, with an output of 12,000 mW at 32 ohms, it’s one of the most powerful we’ve ever sold. In addition to the 4-pin XLR output, it has a 6.35-millimeter low gain and a 6.35-millimeter high gain. There’s even an output for dual 3-pin XLR: a welcome sight for those who use this rarer balanced out with their headphones. Two XLR outputs function as a prestage and are ideal for sending out to high-end studio monitors. Complete with an all-aluminum chassis, a fully balanced architecture, and two LM49720 dual opamps, the H20 has already garnered a lot of excitement from Head-Fi users.

Note: At checkout, choose black or silver.

Gustard H20 Balanced Headphone Amp
Gustard H20 Balanced Headphone Amp
Gustard H20 Balanced Headphone Amp
Gustard H20 Balanced Headphone Amp
Gustard H20 Balanced Headphone Amp
Gustard H20 Balanced Headphone Amp

Color Options



  • Chassis: All aluminum
  • Line input: 1 x RCA, 2 x XLR
  • Line output: 1 x XLR (preamp output)
  • Amp output: 1 x 6.35mm single-ended high resistance, 1 x 6.35mm single-ended low resistance, 2 x three-core balanced output, 1 x four-core balance output
  • Dimensions, without protruding parts: 13 x 10.2 x 2.6 in (330 x 260 x 65 mm)

Analog Input

  • RCA standard input group, input sensitivity typical value: 2 Vrms; input impedance 47 kohms
  • XLR balanced input two groups, input sensitivity typical: 6 Vrms; input impedance 2.4 kohms

Front Analog Output (XLR)

  • Output impedance: 200 ohms
  • Frequency response: 20–80 kHz / -0.1 dB
  • Signal-to-noise ratio: >122 dB
  • Channel crosstalk: -130 dB at 1 kHz
  • THD+N: <0.0004%
  • IMD: <0.0004%

Amp Output

  • Frequency response: 20–80 kHz / -0.1 dB
  • Signal-to-noise ratio: >120dB
  • Channel crosstalk: -120 dB at 1 kHz
  • THD+N: <0.0005% at 6,000 mW into 32-ohm load
  • IMD: <0.0005% at 6,000 mW into 32-ohm load
  • Maximum distortion output power: 6,000 mW into 32-ohm load
  • Maximum output power: 12,000 mW at 32 ohms (THD = 1%)

Load Power 

  • 64 ohms: 5,360 mW
  • 150 ohms: 2,680 mW
  • 300 ohms: 1,340 mW
  • 600 ohms: 670 mW


  • Power adapter


All orders will be shipped by Massdrop.

Estimated ship date is July 18, 2018 PT.

After the drop ends, payment will be collected and the group’s order will be submitted to the vendor up front, making all sales final. Check the discussion page for updates on your order.

Recent Activity

Research by Olive and Toole shows that even wide band frequency response deviations have a minimum audible threshold of around 0.5dB. Pretty much any DAC can manage ±0.1dB 20Hz-20kHz, so nothing audible there. From a cursory bit of digging, the lowest minimum audible threshold for distortion that I could find was 0.7%, which is more or less in line with the conventional wisdom of "distortion below 1% is not audible". Again, any decent product will be well below that, and since music is much more complicated than pure sine waves, audible levels will actually be higher due to being masked. Nothing there either. Jitter is pretty much the same story: below audible levels. In fact, even basic gear can get the jitter products to be below -100dB, which is so low that many devices would actually mask that with their own noise, so nothing audible from jitter. So that leaves noise from the devices themselves which are, again, well below being audible unless the amplifier is turned up ridiculously high, to the point where playing actual music through the system would blow something up. Headphone resolution has nothing to do with it. It is human ears that lack the ability to detect these differences, and while some people claim otherwise, they inevitably fail controlled tests. Much of what people claim to hear actually comes from between their ears, not the world beyond them. The human brain actually has connections that feed back to sensory inputs, including hearing, which can alter their activity, thus altering what we think we perceive. Google the McGurck Effect. There is plenty of research online showing that placebo effects can do all kinds of wonderful things, like alleviating pain and treating depression so severe that the subjects were hospitalized.