Aiyima A07 Max Amplifier Review

[amirm]

I stand corrected. (So where did @JSmith Get the photo shown above, post #7?)

The original and the sample I have had 50 volt caps. Due to you all beating them up , they made a running change to 63 volt.

 

[amirm]

@amirm
Would you be testing mono mode on this amplifier?

What is the lowest impedance it is rated at in this mode?

 

[JSmith]

The A07 MAx capacitor that arrived from China's AIYIMA Store yesterday had been changed to a 63V withstand voltage.

I stand corrected. (So where did @JSmith Get the photo shown above, post #7?)

The pics (October 2023) must of been taken of first release units as this pic also shows 50V Rubycon caps (at least in this one the right cap is aligned properly);

Whereas @Toku says the version he received has 63V Nichicon caps, as is shown on the Aiyima website;

@amirm, any chance you could do a teardown of the model sent to you by @AIYIMA?

The original and the sample I have had 50 volt caps. Due to you all beating them up , they made a running change to 63 volt.

Edit: Ah, I see, as you were.


JSmith

 

[Guddu]

What is the lowest impedance it is rated at in this mode?

2 ohm

 

[Joe Smith]

I stand corrected. (So where did @JSmith Get the photo shown above, post #7?)

That I believe was an early inside shot as early production runs were occuring? It showed up on one of these ASR MAX threads about a month ago.

 

[Joe Smith]

SPL meter may not accurate enough to find such differences. You need to use a volt meter.

It would be great if someone else could test for channel imbalance to compare to Amir's...probably a production run issue with these cheaper pots, there will be some units that are better than others? A shame that volume pots cause so much of an issue in many of these sub-$200 items, both US made (e.g., Schiit) and the Chinese makers...

 

[wwenze]

This appears to be a different design to the prior A07 models;

View attachment 329676

It just goes to show that independent measurements are needed, without assuming prior performance means future performance in all aspects. Thanks for the testing results.


JSmith

I'm amazed enough that there is a big ass NTC in a $85 amp. No idea what for tho. Not like 4400uF @ 36V can generate a lot of inrush current.

 

[solderdude]

Inrush current limiter.
Charging 4400uF when connected to a 48V power supply will give a hell of a spark when plugging in the low voltage DC connector 'live'.
When using a 10A power supply that is already running the inrush current can easily be 30A (internal capacitor in the external PS discharging into the basically 0 ohm 4400uF caps on start up.
I guess they really wanted to avoid the NTC but could not.

The used low voltage/low current barrel plugs really aren't designed for 48V/10A

 

[MCH]

Thanks @amirm !
I second the request for mono mode test, see if it has some more juice, as it is the differentiator of this amp.

 

[Bleib]

Quite disappointing considering its name

 

[Kachda]

Perfect own goal

 

[Talisman]

As I had already written in the specific thread, this is a clone of V3, created given the success of Fosi's "cousins". Measurements show that copying a style does not imply copying a quality. The v3 is ahead in terms of performance and power (considering that for the same price it is sold with a 48V power supply). I see no reason to buy this product

 

[delta76]

The measurements indicated they are pretty far off their specs.

View attachment 329675

those numbers are always with 10% THD which is useless in practice. It is misleading yes but many manufacturers do that, even reputable ones like Yamaha

 

[Klonatans]

I have doubts about its longevity.

 

[ninetylol]

Pity about the the balance problems. I second the BTL mono testing, which would eliminate the issue and show one of the main features of this amp. Thanks @amirm

 

[Rja4000]

Thanks for this review.
This model is interesting.

The sample you get may be the same, worse or better

I think that's what it's about: low cost comes with drawbacks.
Still, the difference is just 1dB, isnt it ?
Can we really hear it ?

 

[AIYIMA]

这是对爱依玛 A07 Max 立体声 D 类放大器的回顾和详细测量。它是公司发给我的，售价（我认为）85 美元，附带电源：

AIYMA staff never listens no matter how many times I point this out.
Many members of ASR have not pointed out anything about this until now.

What we sent to Amirm was the earliest version of A07 Max, which has now been updated to 63v capacitors.

 

[Toku]

What we sent to Amirm was the earliest version of A07 Max, which has now been updated to 63v capacitors.

Yes, when I checked the second A07 Max that arrived from AliExpress's AIYIMA Store yesterday, it had been changed to a 63V 2200uF capacitor.
In the future, please adopt 63V withstand voltage for the capacitors of amplifier products that operate at 48V.

 

[Sokel]

2 ohm

View attachment 329704

I may be wrong but if it will ever achieve a steady 600 watt at 2 Ohm for more that 30 sec with this case it's color may turn to hot glowing red instead of black/blue.

Thanks Amir!

 

[Toku]

The measurements indicated they are pretty far off their specs.

View attachment 329675

This BTL/PBTL output table has some really strange numbers lined up.