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I can definitely understand what you are saying, but they normally I find a few manufacturers more accurate than others, I keep SMSL on the positive side. I, myself, find this pretty decent but you are correct that other products do have better noise/distortion measurements.

Thank you @Kitty (S.M.S.L Marketing). Published THD+N 0.003% should come around -90dB SINAD which is really good. PFFB or not, there is surely some kind of optimization that has worked nicely here. Freq. response looks perfect, I am guessing the orange line is for 4ohm.

I think - YES.

@Alexander Lin Just a quick suggestion to simply improve user experience:

Here is new additional from O-Noorus............... O-NOORUS D4 PRO TPA3255 PFFB stereo HPF LPF Amplifier with Balance HDMI ARC Bluetooth USB Optical Coaxial RCA input, 3-Band stereo EQ tone and bypass...

I see, so K11 R2R can use Coax out in USB mode.

K13 R2R provided specs says 0.0173% THD+N which should be around -75dB SINAD

@3eaudio This is already Excellent news..... Congratulations and best wished for this new product. I won't even guess than 9 out of 10 would use it with AVR/processor pre-out for home theatre, and probably most important factor here would be higher power even if noise/distortion is a bit...

I hear you but I think you missed my point.. which simply was that it's not worth this price. There are even more expensive worthless subwoofers as well in this world. I just hoped you would have simply asked about some good options around that price mentioning your location/region.... It would...

For me. ***Go for RSL for similar price.

K13 R2R has coax input only, no coax or any other digital out. LO is is Line Out mode without pre-amp function for RCA/XLR output, volume control disabled.

OS vs NOS - Is it really audible? *****No textbook theory on this one please***** Dear FMs, I am really interested to explore this and looking for your experiences or controlled/un-controlled tests that you could suggest in this respect. I know what the theory says about OS & NOS but can you...

I hope you can help in finding couple of answers for us, these are kind of common questions on TPA3255 based amplifier here: 1) Does AL400 use PFFB circuit? 2) Do you have frequency response graphs for 4 & 8 ohm loads? 3) What is output impedance of AL400. BTW, I did reach out on FB asking...

SMSL haven't mentioned it anywhere, so most likely there is no auto ON/OFF on signal sense.

Priced @275$

SMSL also jumps onto TPA3255 amp space now, quite a package of features in this small unit: Note- They haven’t mentioned PFFB, so it’s unclear but possibly not deployed. Frequency response graphs aren’t available as well.

What are your speakers? It could most probably be your speakers and room interaction than 3e A7.

Aiyima A80's re-birth with some changes/upgrades Looks like some of the things I missed have been added..... good additions @AIYIMA This is what I said in OP:

No, it doesn’t have auto power-ON.

I definitely agree but I thunk I myself can’t really say if they are biased or wrong. It’s their opinion and understanding which may or maybe match with others. Normally I avoid all that but pulled plug on K13 R2R and trying to understand all NOS / OS thing, but I also am realizing that there is...