AIYIMA A07 TPA3255 Review (Amplifier)

[ROOSKIE]

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.

 

[renaudrenaud]

They are already in bridged mode.

There is something I do not understand. To my comprehension if a TPA3255 is bridged in mono you have to use 2 TPA3255 for stereo operation, isn't it?

 

[JohnYang1997]

There is something I do not understand. To my comprehension if a TPA3255 is bridged in mono you have to use 2 TPA3255 for stereo operation, isn't it?

Tpa3255 has 4 individual channels, so
you can have TWO BTL channels
or ONE PBTL(parallel) channel
or FOUR SE channels.

 

[daftcombo]

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.

 

[renaudrenaud]

Tpa3255 has 4 individual channels, so
you can have TWO BTL channels
or ONE PBTL(parallel) channel
or FOUR SE channels.

Got it.

 

[Matias]

Average performance that becomes acceptable for the dirt cheap price.

 

[gvl]

Are there any decent bare amp BTL boards based on this chip?

 

[whazzup]

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.

 

[renaudrenaud]

Are there any decent bare amp BTL boards based on this chip?

The one from Ti, the EVM board?

https://www.ti.com/tool/TPA3255EVM?keyMatch=TPA3255&tisearch=Search-EN-everything&usecase=GPN

 

[pma]

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.

 

[pma]

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.

 

[whazzup]

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!

 

[gvl]

The one from Ti, the EVM board?

https://www.ti.com/tool/TPA3255EVM?keyMatch=TPA3255&tisearch=Search-EN-everything&usecase=GPN

A bit spendy at $149 when you can get a complete amp with a PSU at half of that price.

 

[pdmjoker]

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...

 

[DuncanTodd]

Thanks for the review Amir.
As pavuol pointed out, there are a few variation of this amp. It can be useful to see it's guts to know which of them got reviewed.
This product seems to be very popular with DIYers who modify and replace parts.
It has been heavily discussed on a thread here:
https://www.audiosciencereview.com/forum/index.php?threads/which-tpa3255-amp-do-you-recommend.9148/

 

[phoenixsong]

Not sure if it's exactly the same, I could only find this version with different opamp options on Aliexpress (it's not available on Amazon where I am): AIYIMA TPA3255 Power Amplifier 300Wx2 Class D Stereo Digital Audio Amp HiFi 2.0 Sound Amplifier Speaker Home Theater DIY|Amplifier| - AliExpress
Also, more specs and performance measurements of the TPA3255 chip: TPA3255 315-W Stereo, 600-W Mono PurePath™ Ultra-HD Analog-Input datasheet (Rev. A) (ti.com)

 

[daftcombo]

I found member @Toku pointed out about this model being revised over time - #193

Spoiler: Internals

official:

toku - differences:

Is it better with or without the pop noise prevention circuit?

 

[phoenixsong]

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

 

[pavuol]

Is it better with or without the pop noise prevention circuit?

Maybe some member can later clarify, so far I found a hint #467 in the TPA3255 thread that Amir probably tested the revisited design.

 

[DuncanTodd]

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.