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AIYIMA A07 TPA3255 Review (Amplifier)

Thanks for this review. I almost ordred a couple for some projects but had not yet quite made up my mind, actually was leaning very close to yes.
Seeing this review I will be bowing out. Not quite what I am looking for.
I can certainly see why some folks will be very pleased and can see how this would be a good fit for many.

*I do wonder how much more power it produces with a larger supply. Likely not worth testing again though.
 
Happy new year @amirm !

Great review.
Could you do a listening test like you did for the Loxjie?
In the TPA3255-based amp offering from 3e-Audio, there is some buzz in the speakers. I'd like to know if this one produces some as well.
 
Tpa3255 has 4 individual channels, so
you can have TWO BTL channels
or ONE PBTL(parallel) channel
or FOUR SE channels.

Got it.

TPA3255 315-W.png



TPA3255 315-W _2.png
 
Average performance that becomes acceptable for the dirt cheap price.
 
Are there any decent bare amp BTL boards based on this chip?
 
Am I understanding this correctly?
At -90dB, the mains hum should not be noticeable audibly, right? Or it might be, with sufficient loudness / speakers with sufficient sensitivity? Like if the volume knob is turned to max.
 
Thanks for this review. I almost ordred a couple for some projects but had not yet quite made up my mind, actually was leaning very close to yes.
Seeing this review I will be bowing out. Not quite what I am looking for.
I can certainly see why some folks will be very pleased and can see how this would be a good fit for many.

*I do wonder how much more power it produces with a larger supply. Likely not worth testing again though.

I have just ordered one pc at Amazon.de, priced EUR 59.42, free shipping. I will make my own measurements with a large linear power supply and post it in a separate thread. I will also measure out-of-band spectrum and noise and behaviour with complex load, as well as behaviour at low power with respect to the noise.
 
Am I understanding this correctly?
At -90dB, the mains hum should not be noticeable audibly, right? Or it might be, with sufficient loudness / speakers with sufficient sensitivity? Like if the volume knob is turned to max.

It is -90dB with respect to 5W/4ohm, i.e. with respect to 4.472Vrms. This would be -77dBV and this is audible with a speaker with common 86-90dB/2.83V/m sensitivity. However, no measurements at lower power like 100mW were shown. This would tell if the hum components are constant or level related. If it is a case of PSRR, hum will depend on used power supply filtering as well.
 
It is -90dB with respect to 5W/4ohm, i.e. with respect to 4.472Vrms. This would be -77dBV and this is audible with a speaker with common 86-90dB/2.83V/m sensitivity. However, no measurements at lower power like 100mW were shown. This would tell if the hum components are constant or level related. If it is a case of PSRR, hum will depend on used power supply filtering as well.

Ah, got it thanks!
 
It seems as if ASR (ie Amir) is in danger of getting a reputation for producing objective and credible reviews!

I recently read an amplifier review on another website which said that none of their lab measurements suggested why the item being tested sounded as good as it did. Hmm...
 
To the knowledgeable souls here, how is the total distortion of the amp and speakers calculated? I'm wondering if this combined with the JBL Stage A130 will be better than my current LSR305s for instance
 
Maybe some member can later clarify, so far I found a hint #467 in the TPA3255 thread that Amir probably tested the revisited design.
There are a few builds of the products named A04/A07. Some internal parts are different (like capacitors). Later ones seem to have a green board, older ones have a black one.
 
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