Gustard H20 Opamp Dual LM49720 Full Balanced Class A Headphone Amplifier Pre Amplifier

US$836.99 US$929.99


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Product Details


Line input: 1*RCA, 2*XLR

Line output: XLR * 1 (Preamp output)

Amp output: 1*6.35mm single-ended high resistance,

1*6.35mm single-ended low resistance

2*Three-core balanced Output, 1*four-core balance output

There is Pre-amp output,Gustard H20 could be used as Power amplifier and Pre Amp connecting Active Monitor.


Technical Parameters:

The power amplifier circuit uses separate Class A lines, each channel 2 pairs of power tube, a total of 8 pairs of power tube;

Each channel uses two independent amplifying units to form a symmetrical output line, Single-ended and balanced output are at the same time ;

The front class consists of a single 4-way amplifier circuit, using two LM49720 dual op amp;

Have a separate pre-stage output, can be connected to active speakers or pure after the class;

The use of matrix relay volume, effective to ensure that 4-way volume unanimous;

Native full-balanced architecture, from input to volume control to before and after zoom, without any conversion, complete four-way architecture;

The main filter uses Nikon nichicon audio capacitor KG gold tune

Equipped with third gear gain (high,middle,low), Support amp and line (XLR) output at the same time;

There are three inputs: RCA * 1, XLR * 2

The left and right channels each adopt a custom 50W audio ring transformer, completely independent of each other without interference;

All aluminum chassis, silver and black colors available;

Machine size: 330 * 260 * 65MM (without protruding parts);

Packaging size: 420 *360*175MM;

Package weight: 6.0KG;



Analog input:

RCA standard input group, input sensitivity typical value: 2Vrms; input impedance 47kΩ

XLR balanced input two groups, input sensitivity typical: 6Vrms; input impedance 2.4kΩ

Front analog output (XLR):

Output impedance 200Ω

Frequency response: 20-80kHz /-0.1dB

Signal to noise ratio:> 122dB

Channel crosstalk: -130dB @ 1kHz

THD + N: <0.0004%

IMD: <0.0004%

amp output:

Frequency response: 20-80kHz /-0.1dB

Signal to noise ratio:> 120dB

Channel crosstalk: -120dB @ 1kHz

THD + N: <0.0005% @ 6000mW into 32Ω LOAD

IMD: <0.0005% @ 6000mW into 32Ω LOAD

Maximum distortion output power 6000mW into 32Ω LOAD

Maximum output power 12000mW @ 32Ω (THD = 1%)

• Load power:

64Ω 5360mW

150Ω 2680mW

300Ω 1340mW

600Ω 670mW

Questions & Answers

  • Q: In this Q&A, you answered to Alexey's question that "6.35mm single-ended low resistance impedance is 50Ω." Are you really sure about this? 50Ω output impedance for HP out is insanely high.
  • A: Hi Slash, Output Impedance(6.35mm) “L” (For Low Impedance Headphone) is 50Ω . Thank you!
  • Slash 5/29/19 12:42 PM Asked.
  • Q: Do you have a manual available for download?
  • A: Hi John, you can download it from: Thank you!
  • John 3/25/19 10:42 PM Asked.
  • Q: I almost always listen to music using my computer. How could I connect Gustard H20 to my computer?
  • A: Hi Cengiz, it needs a decoder.Thank you!
  • Cengiz 2/17/19 3:50 PM Asked.
  • Q: Could you tell me if H20 comes with 110 Volt or 220 Volt power. I am in USA and power supply is 110 Volt. Thanks.
  • A: Hi Robert, The volt is adjustable.We will send the correct Volt according to your country.Thank you!
  • Robert 1/12/19 11:29 AM Asked.
  • Q: does this unit come with a remote control for volume, etc. ?? thank you kind regards Stefan
  • A: Hi Stefan, this unit has no remote control.Thank you!
  • Stefan 12/11/18 11:06 AM Asked.