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Gustard H10 Class A Headphone Amplifier GUSTARD engineers insist that H10 better than A1 Lehmann. A 20-year electronics research and development work experts. Of course, everyone’s feeling is not the same. Class A headphone amplifier with high current current output. For each channel in the amp it has 2 independent amplification circuit. The H10 features two independent amplification circuits for the left and right channels, four gain switches, two RCA inputs, and two balanced XLR inputs.. There are 4 pre-buffer adjustment functions build in with the amplfier and that mean the amplifier using pre-stage buffer and main amplifier components. By using 4 paris audio power tube output circuit, the H10 could easily drive variety of different impedance headphones. The Gustard H10 built in with 2pcs 25W transformer and they correspond left and right channels power supply and highly reduce the channel crosstalk. Technical Specifications: Signal Input: 2x XLR female, balance 2x RCA, unbalanced AC115V/230V international voltage input Maximum input level: +21 dBu, impedance 10kohm Input impedance: XLR: 10kohm, RCA: 68kohm Input Sensitivity: +6 dBu Main amplifier gain: +8 dB Main amplifier gain adjustment range: -4 / +2 / +8 / +14 / +20 dB Frequency response: 0-55kHz (-0.5dB) Damping Factor:> 400 @ 50ohm Dynamic range:> 128dB (A-weighted) Background noise: <-100dBu (A-weighted) THD + N (1kHz 1W @ 100ohm): <0.00035% THD + N (1kHz 0.5W @ 32ohm): <0.0007% Crosstalk:-110db (1kHz) Headphone Output: 1x 6.35mm TRS Jack Power supply voltage: 230V AC/115 AC; 50/60Hz Power consumption: < = 20VA Machine Standard: GB a three-prong power cord Machine size (not included prominent part): length × width × height = 273mm × 190mm × 70mm Weight: Net Weight 3.3KG, including packaging 4K Selling at $525