●The sound quality of the new generation of AURA AMP A3PR0 (2019.11.11 upgrade) is as follows:1) Completely warm and bile sound, sweet and beautiful musical instruments, natural vocals, slender and vivid details, musicThe instrument and human voice are rich in texture, not sticky, not muddy, or dry;2) The tone is gentle and soft, the sweetness is between light sweet and strong sweet, the sweetness texture is good, sweet but not greasy;3) The sound bottom is clean, the overall sound quality is delicate and sweet, moist and smooth, not tired after listening for a long time;4) Warm, sweet and thick sound bottom, stable bottom plate, big thrust, big dynamics and strong control;5) The bass dive is deep, soft and solid, and the drum sound is low and rebounds quickly;The new generation of AURA AMP A3PRO fully balanced amp features are as follows:1) Fully balanced architecture, independent power supply for left and right channels and independent loop design, taking into account 2.5 and 3.5Balanced input/output ports, 3.5 input/output ports are compatible with single-ended input/output at the same time;2) Four groups of +/-18. 5V dual power supply design, abundant power supply, strong driving force and control;3) Electric display, which can monitor electricity t in time;4) High/low gain switch, compatible with full impedance earphones;5) Tone color switch, the tone color 1 input signal is input through the pre-stage buffer, and the tone color 2 input signalNo. directly into the power amplifier, the difference between timbre 1 and 2 is related to the previous sound source and the pair of recording lines;6) The user-friendly arc design of the casing enhances the comfort of the hand.Four groups of +/-18.5V dual power supplies in parallel for power supply, discrete large drive MOSFET field effect tube powerOutput design, output internal resistance is extremely low, suitable for 10-600 ohm all-impedance headphones;C big drive, big thrust, big dynamic, output power is comparable to shoulder machine, push full HD650, HD800,DT880, DT990 and other big ears;The sound is clean and has no noise, the instrument and piano music are not accompanied by sizzling, and the song background is also not accompaniedSizzle.●Specifications:●Input Z: 22KQ●Output Z:4.7Q●Usable Headphone Impedance Range:8-600Q●Input Sensitivity: 1. 2V soil 50mV●Frequency Response:@600Q10Hz-110KHz -0.2 -1. 5dB; 20Hz- -40KHz 0dB●SNR (Typical) :>=90dB●THD+N, 1KHz:< 0.1%, 100mW into 25Q●Output Maximun Power: 600 Q @280mW16Q>3W●Net Weight:0. 25Kg●Dimensions: L110mm x W63mm x H15mm●Externa | Power: 5VDC, 1-2A(Exquisite packaging box built-in: 1 host, exquisite SENHEISER gold-plated 3. 5M-3. 5MM plugOne DIY silver-plated single-ended signal line, one USB charging cable, and two black straps.(Built-in 400mAh lithium battery, in order to produce warm and thick sound quality, the quiescent current per channel is set relativelyLarge, quiescent current consumes a lot of battery power, and the overall battery life of this machine is about 6 hours.It depends on the output audio signal power.(The hardware sound bottom of this machine is extended on the circuit of high-power discrete MOSFET tube power amplifier, becauseThe output internal resistance is low, and the output transient, thrust and control force can be better.(In addition to the good hardware foundation of this machine, the sound quality part is carefully adjusted with fever materials.Materials:C) USB socket, potentiometer, 3.5MN socket, etc. are made in Taiwan.The capacitor uses WIMA (weima), PANASONIC (Panasonic),ELNA high-grade audio dedicated silk film capacitors, etc.(All other parts are made of brand-new genuine materials, with stable and reliable quality.