AIYIMA A70 Stereo Amplifier Review

[CassilinRyan]

Is there also a design to replace the op-amp chip?

 

[hampestampe]

Is there also a design to replace the op-amp chip?

The product pictures from Aiyima web page sugest that's it's possible.

 

[CassilinRyan]

The product pictures from Aiyima web page sugest that's it's possible.

That's great,thanks,I went to their website to read the details and it's very good, I'm thinking of getting one to try when more people receive it

 

[Ace123]

Does anyone else have one yet? I'm wondering about the heat because mine is getting very hot when left on but not playing

 

[hampestampe]

Does anyone else have one yet? I'm wondering about the heat because mine is getting very hot when left on but not playing

No, not yet I think it will arrive on Monday. I will messure the temperature with my laser theromometer, for you. I've also will use the 10A powersupply.
Does the temperarute change or is it just pretty hot all the time? Do you know how much power it uses when in standby? Can you estimate how hot it gets, can you tuch it?

 

[Ace123]

I can touch it but it would burn. I have a laser thermometer. I'll try and find it

 

[Ace123]

I can touch it but it would burn. I have a laser thermometer. I'll try and find it

The top is 105 degrees fahrenheit. The sides and bottom are hotter at 110 degrees. This is when it's playing but even idle (but on) it was this hot or very close. I now have it sitting on blocks to get more airflow on the bottom.

 

[Jon L]

Hummmmm
The Fosi V3 with no PFFB / RCA has a better Sinad than the Aiyima A70 with PFFB / RCA @ almost same gain..... The same goes for the ZA3 with no PFFB....

ASR measurements of Fosi V3 Monos also show RCA input has lower performance than XLR. Fosi V3 Mono's use an extra op-amp at the input to convert single-ended to balanced, and I suspect same thing is happening with Aiyima A70. If one is not using true balanced source, I would go with the other models.

 

[AIYIMA]

ASR measurements of Fosi V3 Monos also show RCA input has lower performance than XLR. Fosi V3 Mono's use an extra op-amp at the input to convert single-ended to balanced, and I suspect same thing is happening with Aiyima A70. If one is not using true balanced source, I would go with the other models.

The difference between rca and xlr is 2-3db。

 

[Ace123]

In the sample A70 for Amir review, the difference between rca and xlr was about 10db. Later we found this problem and now it has been improved. Now the difference between rca and xlr is 2-3db.

Do you have anything to say about the heat I'm experiencing? Is that normal?

 

[AIYIMA]

Do you have anything to say about the heat I'm experiencing? Is that normal?

We'll get back to you tomorrow, we're getting ready for testing.

 

[hampestampe]

The top is 105 degrees fahrenheit. The sides and bottom are hotter at 110 degrees. This is when it's playing but even idle (but on) it was this hot or very close. I now have it sitting on blocks to get more airflow on the bottom.

I've played music on my A70 now, for 30-40 minutes or so, the temperature rised from 75°F at cold/start up to just around 87-91°F when playing, no big difference where i put the laser to messure, it has stabilized at that temperature level. I will come back and tell you about temperature in idle/not playing later, but probably will not get warmer than that, I guess.

 

[Ace123]

I've played music on my A70 now, for 30-40 minutes or so, the temperature rised from 75°F at cold/start up to just around 87-91°F when playing, no big difference where i put the laser to messure, it has stabilized at that temperature level. I will come back and tell you about temperature in idle/not playing later, but probably will not get warmer than that, I guess.

What power block, 5 amp or 10 amp? And how do you like the sound so far? Besides the heat, I'm a fan. Casino Royale sounds phenomenal

 

[hampestampe]

What power block, 5 amp or 10 amp? And how do you like the sound so far? Besides the heat, I'm a fan. Casino Royale sounds phenomenal

Sounds great temperature has climbed to 96F now, after one h. But thats not hot, just warm, absolutly nothing to worry about.

 

[hampestampe]

What power block, 5 amp or 10 amp? And how do you like the sound so far? Besides the heat, I'm a fan. Casino Royale sounds phenomenal

I'm using the 10A power supply.

 

[Guddu]

I've played music on my A70 now, for 30-40 minutes or so, the temperature rised from 75°F at cold/start up to just around 87-91°F when playing, no big difference where i put the laser to messure, it has stabilized at that temperature level. I will come back and tell you about temperature in idle/not playing later, but probably will not get warmer than that, I guess.

It shouldn’t be an issue, AVR’s run hotter than this all the time without problems.

Do you see screws on case bottom plate?
Is temperature relatively hotter if you put amplifier upside down and check near the screws where TPA3255 chip heatsink is placed probably?
This at least should tell if this heat is because of chip or not, without tearing the case off.

 

[hampestampe]

It shouldn’t be an issue, AVR’s run hotter than this all the time without problems.

Do you see screws on case bottom plate?
Is temperature relatively hotter if you put amplifier upside down and check near the screws where TPA3255 chip heatsink is placed probably?
This at least should tell if this heat is because of chip or not, without tearing the case off.

Yes it's around 102°F in that region.

 

[Guddu]

Yes it's around 102°F in that region.

All right, so it appears to be heat from chip which then further radiate through the case which is how it is supposed to work.
If I were you, I would run the amp with some feet to let some air flow help with bottom part of the case. A small low speed usb fan as base plate would probably be the best thing to do, to have peace of mind at least.

 

[hampestampe]

All right, so it appears to be heat from chip which then further radiate through the case which is how it is supposed to work.
If I were you, I would run the amp with some feet to let some air flow help with bottom part of the case. A small low speed usb fan as base plate would probably be the best thing to do, to have peace of mind at least.

OK.
I would not call 102 °F at the warmest part, while playing music a heat issu. If it rises to like 125 or above, I think it might be somthing to rethink.

 

[hampestampe]

OK.
I would not call 102 °F at the warmest part, while playing music a heat issu. If it rises to like 125 or above, I think it might be somthing to rethink.

Moast parts of the amp is 100°F now when I left it on, not playing any music. The part underneath close to the skrews are 105°F. I think it's kind of warm, but not much to worry about, but I might be totaly wrong, on this.
Guess it's not a big difference if it's playing anything or not, this seems to be as warm as it gets. I will keep an eye on this for sure, but I'm not that worried.