Aiyima A07 Max Box Opening

This video 'Aiyima A07 Max Box Opening', I will do a box opening and talk about the specifications. I'll also talk about the testing that we will do on this amp and others. #A07
Link to Aiyima A07 Max: amzn.to/3WJAnYm
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KPS DMM9000BT Multimeter: amzn.to/3NHdSOl
testo 760-2 multimeter link: amzn.to/2JRRS5S
Link to Ideal multimeter amzn.to/3v5ZGZn
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[@versace885]

HI Eddie, looking forward to seeing you show the testing. Thank for this video and the information. 😄

[@KissAnalog]

Thanks so much!!

[@jakubczajka4275]

Thanks! Audio reviews are always good! I hope that one day you will start using your QA and AP and at least show some summary of numbers and graphs.

[@KissAnalog]

Thank you! It is coming in a big way;)

[@christopherkarg6546]

Looking forward to this series :D

[@KissAnalog]

Thanks so much!!

[@brianmack6285]

Looking forward to these! Audio testing, even for amplifiers, seem fraught with emotional bias and opinion. It's hard to quantify, or even understand, some of the qualities people accrue to various amps. That said I've found a few things to look for.
Most, if not all, of these class D Amos have some output filtering to remove switching noise. This can make the upper end of the frequency response sensitive to load impedance. It might be worth measuring with 4 and 8 ohm loads.
A lot of people have noticed "hiss", presumably due to a high NF or maybe poor signal routing. Maybe PSRR?
I find steady state power measurements interesting for thermal reasons but pulsed transient measurements more indicative of real life operation with music. Low frequency issues could stem from the amount, power supply or both. I'm not sure what to think of these bricks sold alongside of these amps. Are they as good as a more industrial power supply ?
Of course there's a standard set of test per some standard setting organization, perhaps a video on your proposed list would be appropriate?

[@KissAnalog]

Thanks for this fantastic feedback! I am publishing a new video tomorrow - that I meant to get out today that is based on this topic.

[@johnshaw359]

You need to ensure you are not testing the PSU, so get busy modding a commercially rated server supply, seen some rated to 48V, 17.5 amp for example an Emerson 48V 17.5A server power supply DS850-9-401. An E-E won't need telling how to fire-them-up, they are electrically safe, relatively cheap, reliable, plentiful, high quality and low noise, coincidently they will likely have a P.F.C front end.

[@KissAnalog]

Thanks John! I will show what difference a power supply can make;)

[@Paxmax]

The power output seems tied somewhat to the frequency being reproduced. I don't think I have seen anyone getting "nominal" power out of the TPA3255 at lower frequencies, sort of 50Hz and below.
Not sure if it is the TI chip internally setting hard limits? DC detection kicks in? Poor choice of external components to set limit / detect fault conditions?

[@KissAnalog]

Thank you! I also think that low frequencies testing is so important;)

Yes, the TPA3255 chips sounding good. I think those chip amps lack dynamic when compared to class AB amps with similar power rating. Is there a way to measure the dynamic behavior? Don´t know how to explain it right, the chip amps are some kinda flat sounding. Thank you

[@jasonk5979]

I have to agree. The budget ones I have heard anyway. I would like to try a better class d amp but it's not in the budget any time soon.

[@KissAnalog]

Thanks for this! I will see what tests that I can do to show this - I have some ideas;)