Special Note:

"230V version" is suitable for use with 200V-240V voltage, medium.

"Voltage version equals international voltage versionI" is suitable for 100V-120V/200V-240V,.

Gustard H20 headphone front-stage fully balanced Class A amplifier;

Cable way input: RCA*1, XLR*2

Cable output: XLR*1 (preamp output)

Earphone output: 6.35 single-ended high resistance*1, 6.35 single-ended low resistance*1

Three-core balance*1 (2 only), four-core balance*1

There is a pre amplifier output, which can be used as an independent pre amplifier to connect to active monitors or pure power amplifiers

H20 technical characteristics:

•The power amplifier amplifier circuit adopts a fully discrete Class A cable circuit that has been used for many years, with 2 pairs of power tubes per channel, a total of 8 pairs of power tubes;

• Each channel uses two sets of independent amplifier units to form a symmetrical output cable, single-ended and balanced output at the same time;

• The pre amplifier consists of a single 4-channel amplifier circuit, using two LM49720 dual op amps;

• There is an independent pre amplifier output, which can be connected to active speakers or pure power amplifiers;

•Adopt matrix relay volume to effectively ensure that the volume of 4 channels is consistent and not biased;

• Native fully balanced architecture, from input to volume control to front and rear stage amplification, without any conversion, a complete four-way architecture;

• With three gains (high, medium and low), amp and cable (XLR) output at the same time;

• There are three groups of inputs: RCA*1, XLR*2\

• A customized 50W audio dedicated toroidal transformer is used for each of the left and right channels, which are completely independent of power supply without interference;

• All aluminum alloy chassis, all silver and all black colors are available;

•Machine size: width 330*deep 260*height 65MM (excluding protruding parts);

•Packing size: length 420*width 360*height 175MM;

•Weight with packaging: 6.0KG;

• International voltage version AC100V-240V (manual adjustment) and 230V version AC200V-240V;

• XLR interface definition: American standard (1 ground, 2 heat, 3 cold).

H20 real shot:

The power amplifier circuit adopts a fully discrete Class A circuit which has been used for many years.

Pre amplifier uses 2 in-line LM49720 dual op amps to form a 4-channel circuit.

2 imported transformers, one for each of the left and right channels

Main filter with Nikon nichicon audio capacitors KG gold tune

Pre amplifier voltage regulator circuit.

Semi-intelligent control circuit.

Adopt matrix relay volume

H20 Specification

RCA  One group of standard input.  Sensitivity：2Vrms(Typical) ；Impedance:47kΩ

XLR  Two groups of balanced inputs. Sensitivity：+18dBu(Typical) ；Impedance:10kΩ

Preamp (Rear Output) Output(XLR)：

Output Impedance:100Ω

Frequency response：20-80kHz /-0.1dB

SNR：>122dB

Crosstalk：-120dB @ 1kHz

THD+N：<0.0004%

IMD：<0.0004%

Headphone (Front Output) Amplifier output：

Output Impedance(6.35mm) “L” (For Low Impedance Headphone) :50Ω

Output Impedance(6.35mm) “H” (For High Impedance Headphone):0.05Ω

Output Impedance(XLR):0.1Ω

Frequency response：20-80kHz /-0.1dB

SNR：>120dB

Crosstalk：-120dB @ 1kHz

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

IMD：<0.0005%     @6000mW into 32Ω LOAD

Maximum distortionless output power:6000mW into 32Ω LOAD

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