Gustard H20 Opamp Dual LM49720 Full Balanced Class A Headphone Amplifier Pre Amplifier
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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 power amplifier circuit uses separate Class A lines, each channel 2 pairs of power tube, a total of 8 pairs of power tube;
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;
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
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%
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%)
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Estimated Delivery Time
For customers in the continental United States:
5 to 14 business days from the date of shipping
For customers in Hawaii and Puerto Rico:
2 to 4 weeks from the date of shipping
International customers can expect longer shipping times, depending on the country in which they live:
Canada: 1 to 3 weeks from the date of shipping
Australia, New Zealand, Germany, France, and the UK: 2 to 4 weeks from the date of shipping
Other countries not listed above: 3 to 6 weeks from the date of shipping
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Defective or Damaged Items
Defective items may be repaired, exchanged or refunded at our discretion for the same model or manufacturer's equivalent model.
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You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
ShippingTo return your product, you should mail your product to: 4F 405, Building F, No.2 Shangxue Science and Technology North, Bantian Street, Longgang Dist, ShenZhen, 518129 Guangdong, China
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