Infineon MA12070 Class D

Radian · 2022-07-27 7:22 pm

I have heard so many textbook engineered top Dacs but none of them wowed me as much as my AK 4495 straight into some €70 Chinese Transformers. The bandwith of these formers is all the filtering you will get but boy does it sound good. I rather live with some EMI than to miss out on this sound

Solve · 2022-07-27 7:24 pm

I have some 1656 layin but don't know if it's worth it to change it in A8?
Sounds pretty good now but I run active two way also with an TPA3255 after 3500hz.

mboxler · 2022-07-27 7:25 pm

von Ah said:
I even used 'sudo alsactl store' to make them stay, but no dice.

Did you run a backup afterwards?

pcp bu

https://forums.slimdevices.com/show...re-cannot-save&p=961972&viewfull=1#post961972

Mike

Radian · 2022-07-27 7:37 pm

Solve said:
I have some 1656 layin but don't know if it's worth it to change it in A8?
Sounds pretty good now but I run active two way also with an TPA3255 after 3500hz.

Yes do so they are very good.
I got them on one of my TPA 3255 and it was a real step up

Solve · 2022-07-27 7:40 pm

Radian said:
Yes do so they are very good.
I got them on one of my TPA 3255 and it was a real step up

Yes I also have them on my two TPA3255.
Have you put them in 12070 yet?

Radian · 2022-07-27 7:49 pm

Yes but I need to apply all the mods that Jean Paul suggested first before I give them a listen.
They will be externaly fed though.

von Ah · 2022-07-27 8:06 pm

mboxler said:
Did you run a backup afterwards?

pcp bu

https://forums.slimdevices.com/show...re-cannot-save&p=961972&viewfull=1#post961972

Mike

No. Thanks for that! Hopefully that will work.

bonjonno · 2022-07-27 8:15 pm

I just received the BRZHiFi version of this amp that set me back ~$22. It's a cute, tight little unit. Powereing with a 135 watt 19.5 volt HP laptop brick. I started out running some foam core mini Karlson's and they were OK. Now I have it hooked up to Focals I built in the 90's. 7" Kevlar woofers and titanium tweeters. It sounds good. Plenty of bass and the highs are not too harsh which can happen with these tweeters. My only complaint so far is there is a slight pop when turning on, even with the volume set to zero. Is there a fix for that that I missed? I think I like my Aiyima A04 (3251) w/ 1656 op amps better. But this unit is too fresh. Need to listen more.

Solve · 2022-07-27 8:27 pm

bonjonno said:
I just received the BRZHiFi version of this amp that set me back ~$22. It's a cute, tight little unit. Powereing with a 135 watt 19.5 volt HP laptop brick. I started out running some foam core mini Karlson's and they were OK. Now I have it hooked up to Focals I built in the 90's. 7" Kevlar woofers and titanium tweeters. It sounds good. Plenty of bass and the highs are not too harsh which can happen with these tweeters. My only complaint so far is there is a slight pop when turning on, even with the volume set to zero. Is there a fix for that that I missed? I think I like my Aiyima A04 (3251) w/ 1656 op amps better. But this unit is too fresh. Need to listen more.

I also ordered one BRZ to test, have one Aiyima A8 and it also click.
For me I so used with it since all TPA3255 that also click so now it just normal.

bonjonno · 2022-07-27 8:30 pm

Thanks, I figured it was a "feature" My A04 which uses the TPA3251 does not make any sound when you turn it on. It's beautiful. So I'm used to that.

mamocel · 2022-07-27 9:10 pm

bonjonno said:
I just received the BRZHiFi version of this amp that set me back ~$22. It's a cute, tight little unit. Powereing with a 135 watt 19.5 volt HP laptop brick. I started out running some foam core mini Karlson's and they were OK. Now I have it hooked up to Focals I built in the 90's. 7" Kevlar woofers and titanium tweeters. It sounds good. Plenty of bass and the highs are not too harsh which can happen with these tweeters. My only complaint so far is there is a slight pop when turning on, even with the volume set to zero. Is there a fix for that that I missed? I think I like my Aiyima A04 (3251) w/ 1656 op amps better. But this unit is too fresh. Need to listen more.

In my opinion if the chip is well implemented with everything else on the board.
I think you will love it.

Solve · 2022-07-27 9:27 pm

mamocel said:
In my opinion if the chip is well implemented with everything else on the board.
I think you will love it.

To little allowed voltage only with 19v should be max 26v.

bonjonno · 2022-07-27 10:18 pm

The amp power input says 15-19V. But I took a chance and tried a 24V 6amp brick I had and it sounds good.

Radian · 2022-07-28 10:44 am

Das mache ich oft bei zu großen SMD Caps:

Radian · 2022-07-28 10:48 am

Sorry guys that was not suppose to be posted here

Solve · 2022-07-29 7:17 pm

Whithout have opened up my A8 I found a picture.
Is it four opamps?
Not two dual?

bonjonno · 2022-07-29 7:36 pm

Hmmm. I thought the merus chip was square with leads on all four sides. Something seems wrong with this image.

Solve · 2022-07-29 7:38 pm

Maybe wrong image.
https://www.audiophonics.fr/en/inte...s-d-infineon-ma12070-2x55w-4-ohm-p-16144.html

bonjonno · 2022-07-29 7:44 pm

Yes I don't know where they got that photo. The aiyima site doesn't show any inside photos. But they have a graphic depicting the merus chip as square and the op-amp next to it the same size. Perhaps a fantasy.

jean-paul · 2022-07-29 9:03 pm

That is the Aiyima A8 with 5 dual opamps. The MA12070 is under the heatsink of course.

Infineon MA12070 Class D

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