AIYIMA A70 Stereo Amplifier Review

[Zoli64]

I recommend a performance improvement method. It requires soldering skills. The cable of the added GAN power supply is quite long but very thin. I shortened it to a length of 20 cm and soldered a DC power plug to it. So it is even more energetic at high volume/dynamics, there is not so much loss.

 

[GUGGE53]

I recommend a performance improvement method. It requires soldering skills. The cable of the added GAN power supply is quite long but very thin. I shortened it to a length of 20 cm and soldered a DC power plug to it. So it is even more energetic at high volume/dynamics, there is not so much loss.

Hi, thanks. Maybe for somebody who has the skill and time, but I'm not gonna spend any time on this. Anyway, it's all been superceded by events. Got an audiophonics 5 channel amp for 500 euros. The c70s set me back 500 from amazon, so in end I got the package for 1000. I know I could've bought an x3800h, but it was too big. The new 5 channel amp is hidden away behind the TV. No issues at all with sound. It's a very good combo together with Ma8000 preamp. Cheers!

 

[Zoli64]

Dear @amirm , please answer me one question already. When you measured the A70 with an artificial load (4 and 8 ohms), you measured power, then how long was the measurement time? Did the final stage have time to warm up? Do you know the sinusoidal 2x 100+ Watts for a 4 ohm load? Thanks for the answers. If someone else has tested it this way, I thank them too. (I wonder if it can even maintain a sinusoidal 2x100w/4 ohm power in the long term with the 48v/5A gan power supply? Does it not overheat or distort? Thanks.

 

[antcollinet]

Dear @amirm , please answer me one question already. When you measured the A70 with an artificial load (4 and 8 ohms), you measured power, then how long was the measurement time? Did the final stage have time to warm up? Do you know the sinusoidal 2x 100+ Watts for a 4 ohm load? Thanks for the answers. If someone else has tested it this way, I thank them too. (I wonder if it can even maintain a sinusoidal 2x100w/4 ohm power in the long term with the 48v/5A gan power supply? Does it not overheat or distort? Thanks.

Amir's power test is not a long term test. However, the testing typically does take long enough to dissipate significant power in the output stage.

You might find this thread interesting which goes into (LOTS OF) detail of long term full power tests.

Power amplifier tests with respect to FTC: 16 CFR Part 432 (July 5, 2024) requirements on output power claims

Some of us feel the need of honest specifications of amplifier output power according to acknowledged documents like FTC regulations and IEC standards. The reason is to get comparable data, protect potential customers and draw attention to false claims of some manufacturers. I have decided to...

www.audiosciencereview.com

 

[Zoli64]

Amir's power test is not a long term test. However, the testing typically does take long enough to dissipate significant power in the output stage.

You might find this thread interesting which goes into (LOTS OF) detail of long term full power tests.

Power amplifier tests with respect to FTC: 16 CFR Part 432 (July 5, 2024) requirements on output power claims

Some of us feel the need of honest specifications of amplifier output power according to acknowledged documents like FTC regulations and IEC standards. The reason is to get comparable data, protect potential customers and draw attention to false claims of some manufacturers. I have decided to...

www.audiosciencereview.com

Unfortunately, I can't measure at home. I would have been interested to know how many Watts of real sinusoidal power the A70 can continuously maintain at 4 or 8 ohms, in long-term operation. How much can reality be? For example, is it capable of 2x70W / 4Ohm sinusoidal power for hours?
Thanks

 

[antcollinet]

Unfortunately, I can't measure at home. I would have been interested to know how many Watts of real sinusoidal power the A70 can continuously maintain at 4 or 8 ohms, in long-term operation. How much can reality be? For example, is it capable of 2x70W / 4Ohm sinusoidal power for hours?
Thanks

This isn't tested here.

If you read the thread, you'll find Amir repeatedly explaining why this is not needed for real use audio amps, and why he doesn't do ti. And other people explaining why they believe it should be tested anyway.

Bottom line - it will never be tested here. If the test information is needed, it should be done by the manufacturer.

 

[Zoli64]

This isn't tested here.

If you read the thread, you'll find Amir repeatedly explaining why this is not needed for real use audio amps. And other people explaining why they believe it should be tested anyway.

Bottom line - it will never be tested here. If the test information is needed, it should be done by the manufacturer.

If anyone has done a similar test on the A70, please write about your experience. Thank you.

one more thing: Is the A70's 48V/5A power supply capable of 200-250 Watts in continuous operation or not?

 

[Zoli64]

The a70 12V regulator type I need it, please help me, which type of 12v regulator is it equipped with? LM2596HVS-12, or another type? It really doesn't matter. Thanks to anyone who helps me...

 

[AIYIMA]

The a70 12V regulator type I need it, please help me, which type of 12v regulator is it equipped with? LM2596HVS-12, or another type? It really doesn't matter. Thanks to anyone who helps me...

The LDO linear regulator uses the LM7812 model, while the DC-DC switching regulator uses the SSP9459.

 

[Zoli64]

The LDO linear regulator uses the LM7812 model, while the DC-DC switching regulator uses the SSP9459.

Thank you.

 

[Zoli64]

The LDO linear regulator uses the LM7812 model, while the DC-DC switching regulator uses the SSP9459.

Dear @AIYIMA Aiyima, everyone! I would like to ask, is the frequency of the TPA3255 in the A70 circuit set to 450 or 600 kHz? Thanks to anyone who can help me.

 

[Audionaut]

I would like to ask, is the frequency of the TPA3255 in the A70 circuit set to 450 or 600 kHz? Thanks to anyone who can help me.

Can you help with what?
What do you need all this data for?
Do they provide a better listening experience?
Or do you need the data for reverse engineering?

 

[Zoli64]

Can you help with what?
What do you need all this data for?
Do they provide a better listening experience?
Or do you need the data for reverse engineering?

If I knew, I might try it on a different frequency. For example, if it's 450 kHz, I'd listen to it on 600 kHz. Just curious. Has anyone checked/tested it yet?

 

[antcollinet]

If I knew, I might try it on a different frequency. For example, if it's 450 kHz, I'd listen to it on 600 kHz. Just curious. Has anyone checked/tested it yet?

Surely if you know how to change it you know how to find out yourself.

 

[Zoli64]

Surely if you know how to change it you know how to find out yourself.

Sorry, but I asked the question in the topic specifically to ask the members what their experience is. Then I'll decide whether to start or not. For now, I'm curious whether it runs at 600 or 450 kHz from the factory. I'm posting to ask for help and experience first. Thanks.

 

[AIYIMA]

Dear @AIYIMA Aiyima, everyone! I would like to ask, is the frequency of the TPA3255 in the A70 circuit set to 450 or 600 kHz? Thanks to anyone who can help me.

600khz.

 

[Zoli64]

600khz.

Thank you, this info is good