Aiyima A07 Max Amplifier Review

[isaac507]

Wow, how come that poor channel imbalance? Faulty pot?

 

[isaac507]

Pretty good amount but one channel shows that rising distortion above a few watts which we also saw in the dashboard.

This seems to confirm that the standard power supply of the A07 Max is indeed very poor, with its power being far from what they claim.

It also corroborates the power supply test image uploaded by an amazon review, indicating that the power supply is significantly overrated.

 

[Jacob8275]

Edit: Went back and looked at the December 2020 A07 review. Most interesting spec comparison to me was that Amir got more power for 8 ohms with the original A07 with the 32v power brick (48 watts) than the new MAX at 8 ohms with the 36v power brick (40 watts).

This seems to confirm that the standard power supply of the A07 Max is indeed very poor, with its power being far from what they claim.

It also corroborates the power supply test image uploaded by an amazon review, indicating that the power supply is significantly overrated.

Perhaps this Amazon review is accurate. The actual power of the 36V 6A power adapter may be only 35V 3A. This could be why the A07, which comes with a 32V power supply, has a higher power output compared to the A07 MAX with a 36V power supply.

 

[wwenze]

Well to get a good gauge of what a 200W power supply should look like, you can take a look at xbox360's

 

[Guddu]

Lol... Chinese outsourced QC...

Distribution center, like Amazon.

 

[AdamG]

The overall reliability of Chi-fi amps is ridiculous

Hi AltoVariago,

I am assuming that you don't mean this in a derogatory manner towards all Chinese people. We have a Forum specific Policy to avoid this description. Therefore, we kindly request our Members avoid using this terminology “Chi-fi” as it can have negative connotations for such companies and individuals.

Thank you for your cooperation and understanding in this regard.

 

[amirm]

Review updated with bridged mode and 48v/5a power supply.

 

[3eaudio]

@amirm Would like to point out as recently some people talking about TP32xx PBTL mode operation and may get confuse with other type.

• TPA32xx (or any other single power supply) amplifier PBTL mode is just parallel 2 set of BTL to increase output capability(current) but won't provide double power(voltage),the power increase depend on loss reduce on the MOSFET and inductor(if parallel).
• other Dual power supply amp configured as SE output(IR2092,Hypex,Purifi,LM3886,etc) can double output power when switch to BTL mode
• Surely TPA3255 also can double output power when switch from SE to BTL configured, but many of product design are use BTL or PBTL not SE.

 

[Talisman]

Review updated with bridged mode and 48v/5a power supply.

With the supplied power supply, in mono it delivers practically the same power as the Fosi v3 in stereo with 48V. Again, no reason to buy

 

[Hiten]

Would be interesting to compare 3e audio and Sylph amplifiers. Which I read are soon to be tested.
Regards.

 

[amirm]

@amirm Would like to point out as recently some people talking about TP32xx PBTL mode operation and may get confuse with other type.

• TPA32xx (or any other single power supply) amplifier PBTL mode is just parallel 2 set of BTL to increase output capability(current) but won't provide double power(voltage),the power increase depend on loss reduce on the MOSFET and inductor(if parallel).
• other Dual power supply amp configured as SE output(IR2092,Hypex,Purifi,LM3886,etc) can double output power when switch to BTL mode
• Surely TPA3255 also can double output power when switch from SE to BTL configured, but many of product design are use BTL or PBTL not SE.

Indeed that must be the explanation behind not getting much more power.

 

[Sokel]

To market such a piece of s*** is ridiculous. Channel imbalance of 20dB is something making an amp unusable.

The 20db difference between channels is not about level,is about H2 (the second harmonic) in the distortion chart.
20db level difference would be absurd!

The level difference is 1db at the point Amir measured it but as this point is almost all the way up it can be a lot worst as we go lower,that's where channel imbalances get more severe.

 

[jayapple]

Beat down by FOSI

 

[TonyJZX]

so a true 70w 8ohm at around $100

given you get one with no imbalance or an imbalance you cant detect i dont think this is as bad as many think

nor is there much better at this price?

 

[OldTimer]

Is it possible that fosi picked the best one, and aiyima picked it randomly?

It could be but it was Aiyama first then Fossi Audio.

 

[OldTimer]

Is it possible that fosi picked the best one, and aiyima picked it randomly?

It could be but it was Aiyama first then Fossi Audio.

i dont think components matters that much to SQ?

reliability? yes

i think both the V3 and Max use high quality brand name components... that's not an issue to me

otherwise at this point it looks like the ZA3 balanced is the king? with xlr thrown in

Agree. Better components mean better reliabilit.

 

[Guddu]

Review updated with bridged mode and 48v/5a power supply.

Thanks @amirm.
As indicated in review that stock power supply isn’t feeding 6a, is it possible to know what is it supplying max?

 

[ninetylol]

Thanks @amirm.
As indicated in review that stock power supply isn’t feeding 6a, is it possible to know what is it supplying max?

Amirs 48v/5a supply probably isnt the Aiyima one either. I guess its the one from the Fosi V3.

My 48v5a aiyima Max from aliexpress is arriving here tomorrow.

 

[GGroch]

Thanks @amirm.
As indicated in review that stock power supply isn’t feeding 6a, is it possible to know what is it supplying max?

There is an interesting ongoing ASR discussion of Aiyima /Fosi /Douk power supplies here. Post 21 shows the manufacturer as Huizhou Fujia Appliance Tech and links to the brand's device report where I do not see model FS-SW21283606000D from Amir's 36v photo. I do see a photo with this same model FJ-SW21283606000D in this post listed
as a 48v 5A power supply. I think the 48v source photo was from a since removed Ali Express listing, not Aiyima itself, so it is possible some photoshop was involved.

 

[TheBatsEar]

I find this statement offensive.

But it isn't. You chose to be offended.

I see good participation here from the Chinese manufacturers.

Who claimed otherwise?

Product variations are to be expected in this product cost segment.

If you can't produce a product well enough to not fail basic testing, maybe you shouldn't be in the business at all.
And maybe you shouldn't send your wares to one of the few reviewers that do proper testing.