Since I'm basically "throwing the book" of measurements at this device, we can see that certain characteristics are the result of the ESS DAC chip itself. For example the "hump" (THD and IMD) between -45 to -25dBFS or so, and the sinusoidal pattern of odd harmonic distortions when examined in very close detail with 0.1dB steps using a low-noise notch filter. Using the latest DSP chip with ST high-power amplifier chip, carefully designed and debugged, its distortion is as low as 0.0008%; THD+N ...................................................................................................0.004% Picture of the setup attached. Hardly an acoustic paradise down here, but at least the Snells make everything sound fun.

USB transmission ....................................................................AsynchronizationSNR ..........................................................................................................103dB

Build quality is definitely a step up vs some smaller/cheaper Aiyimas I've been messing with lately. Well, at least fit and finish - I can't comment on the internals. The color display screen and user-friendly operating system are easy to understand, equipped with full-function remote control function; Inputs ..................................................................................................RCA / XLR A large number of audiophile-grade audio components are used to enhance the subjective sense of hearing;

AAC ..............................................................................16bit/44.1 kHz_320kbps SNR ..........................................................................................................116dB Channel separation .....................................................................................90dB THD+N ................................................................................................0.0008% Weight ..........................................................................................3.3kg/7.28lbs

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.

A controlled power supply stage

Just received the new Sabaj A20. This a brand new class D amp made with a dual Infineon Merus MA12070 and fully balanced. You have the possibility to adjust the bass / treble, the amp also has some presets, I'm not a fan of it, I left it in "direct" mode.

SBC ..............................................................................16bit/44.1 kHz_328kbps 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. aptX .............................................................................16bit/44.1 kHz_352kbps I'm running in bluetooth right now, just because I don't want to haul too much stuff down here tonight. Connecting was easy/normal w my Samsung phone. Unfortunately this phone doesn't do Aptx HD, so I can't test that. Size ...........................................................................280x63x260mm (WxHxD)bits resolution is really not much to ask of modern DACs these days and the graphs basically look like they're layered on top of each other with minuscule variations. Notice that the only mentionable difference is that DACs do have slight frequency response variations, but even this is less than 1dB difference up at 20kHz (and often this is a reflection of the filter selected). I tried to open the case to take pictures of the module, the PCB etc .. but unfortunately it is complicated to dismantle ... 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.