Topic to discuss all things about S.M.S.L iDEA portable DAC + headphone amp (85.99 usd), made by ShuangMuSanLin Electronics Company based in Shenzhen, China. Official website: http://www.smsl-audio.com/productshow.asp?id=133 Measurements: http://archimago.blogspot.com.br/2017/05/measurements-smsl-idea-usb-dac.html Amazon: https://www.amazon.com/SMSL-IDEA-SABRE9018Q2C-DSD512-Mini/dp/B06Y1WFT4W SMSL iDEA Hifi portable usb DAC built-in high quality headphone amplifier, uses the latest advanced second generation XMOS USB Audio solution XCore200XU208, supports up to PCM 32bit/768kHz and Native DSD512(22.5792MHZ), which is very advanced in audio range. Using ESS SABRE9018Q2C as DAC chip, ultra-high dynamic range and ultra-low THD+N DAC, with built-in high quality headphone amplifier. Using ultra-low noise power supply LDO for the best performance. Low phase noise and low clock jitter PLL from Silcon Labs. Ultra-low power consuption design for most of mobile phones, compatible to work with headphone, amplifier and active speaker Featured with function of volume control for DSD files which is the first model can achieve that in this field. Do not have to set volume in computer or phone, volume button in the set itself. Very convenient for users High - precision four layer PCB, good condition of electrical performance, Independent current loop for digital and analog circuit without interference, that is priority for high perfermance of the set. Specification: 3.5mm headphone jack output Micro USB input jack Dynamic range:121 dB Distortion:0.0011% SNR:108dNB Quantization bit rate: 16bit,24bit,32bit,1bit Sampling Frequency: 44.1kHz,48kHz,88.2kHz,96kHz 176.4kHz,192kHz,352.8kHz,384kHz,705.6kHz,768kHz DSD64,DSD128,DSD256,DSD512 Headphone output power 32ohm:35.8mW(THD=0.1%) 64ohm:31.6mW(THD=0.1%) Impedance range:16-300ohm Size:60*16*6mm Weight:9.4g Accessories: short USB A-micro/Micro-Micro/Micro-type-c Any impressions on sound quality?