SBC ..............................................................................16bit/44.1 kHz_328kbps Notice that I've turned on the "Peak" tracing as well to capture the highest values across the 8-average readings. Not unusual to see some 60Hz mains hum with harmonics getting into the measurements with unbalanced connections. We're basically looking at -110dB RCA and -120dB XLR noise floor and distortions otherwise. Using the latest DSP chip with ST high-power amplifier chip, carefully designed and debugged, its distortion is as low as 0.0008%; Channel separation .....................................................................................90dB AAC ..............................................................................16bit/44.1 kHz_320kbps

I tried to open the case to take pictures of the module, the PCB etc .. but unfortunately it is complicated to dismantle ...Built-in multiple EQ modes and high/bass adjustment functions to easily match various speakers and music; SABAJ A30a Power Amplifier 200W*2 Axign AX5689 XU208 DSD512 Bluetooth LDAC Apt-X HD AAC For Passive Speaker & Active Subwoofer SNR ..........................................................................................................116dB

In fact the amp is using exactly the same components as the SMSL DA 9. The design is just different.USB transmission ....................................................................Asynchronization THD+N ...................................................................................................0.004% Overall, this is a phenomenal performance level for a modern PCM DAC for both RCA and XLR line-level outputs.

Initial impressions are great. No noise that I can hear (disclaimer: I'm in my early 50s). It's driving these speakers with plenty of volume, and I haven't tried to really push it yet. At about 30 min of steady medium-high volume it's cool to the touch. Low pass cutoff frequency...................................................................70~200Hz

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Inputs ..................................................................................................RCA / XLR I listened to the amp with my favorite Audiophile Playlist for 1 hour yesterday, it is really impressive @ first listening. Seems promising in relation to its ration performance / price. USB compatibility ..................................Windows 7 / 8 / 8.1 / 11(Needs Driver) Mac OSX、Linux(Driverless)

Size ...........................................................................280x63x260mm (WxHxD) Anyway, no noise, no hiss, no distortion BUT I have not even gone close to turning it up anywhere near max (apartment).This is my second amp based on this chip. I had already reviewed a fully symmetrical dual Mono MA12070 that I had built a few months ago. Since I own almost all TPA325X in the market and some Hypex Ncore and Purifi at home, I can tell you that it is pretty good even very good in comparison ... for the little that I have heard.