There is an error in the device. The film input caps are each in series with 2 ceramic caps. That is why the bass is shy (in case you didn't notice). They used 1 µF film in series with 2 x 2.2 µf ceramic caps.
https://www.diyaudio.com/community/threads/infineon-ma12070-class-d.347422/page-31
https://www.diyaudio.com/community/threads/infineon-ma12070-class-d.347422/page-31
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If they are or aren't, it does not make much of a difference as they're gone. They seem original.
BTW the PCB layout is different from older versions. It also says explicitly 10 µF 50V which is good.
Critical ones are the 4 x 225 of the inputs. I did not dare to remove them so I soldered 2.5 mm pitch film caps over them.
BTW the PCB layout is different from older versions. It also says explicitly 10 µF 50V which is good.
Critical ones are the 4 x 225 of the inputs. I did not dare to remove them so I soldered 2.5 mm pitch film caps over them.
No I did not notice but up until now it was irrelevant for me as I bypassed the whole deal. Thanks for the notice. Capacitence is already on the low site I guess.
Some times I have problems following you.When you don't notice it always is irrelevant
I did not have any of those caps and opamps in the signal path
These micro sized coils are really bothering me. Look at the comparsion with a 1/4watt resistor. This must be the real cause of the bass Lack. I had on both amps (A8 and BRZ)
the active stage skipped but the bass was phenomenal with the A8 but just normal with the BRZ.
the active stage skipped but the bass was phenomenal with the A8 but just normal with the BRZ.
Attachments
Just pointed out why there is lack of bass and that is factor 1. Modify if you want, then test/measure and listen so verification if the modifications changed matters for the better. Then factor 2... That really is the correct sequence. How parts look and what feeling they may give is not relevant. Measure the properties to judge them. Example: if you leave the caps in series and change the coil to another one there will still be shy bass.
The older version does have larger coils but in lower value. Or am I missing a dot? That they are 1.5 µH?! PCB says 15 µH which is simply unlikely.
BTW there is quite some info on EMI output on the pages I pointed to.
The older version does have larger coils but in lower value. Or am I missing a dot? That they are 1.5 µH?! PCB says 15 µH which is simply unlikely.
BTW there is quite some info on EMI output on the pages I pointed to.
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We constantly missunderstand each other.
Amp two will be with opamps and all of your suggestions.
Amp one is still balanced 4 caps direct coupled.
Amp three will be granted a transformer:
Maybe you are the cause by using short communication. Could just be I gave the example IF you have an active setup then things will not be in phase. Just tips. A reader does not extract automatically that you are modifying 3 amplifiers just for use with 2 channels. You also mentioned an active setup I think?!
Direct coupled = DC coupled.
I gave the example IF you have an active setup then things will not be in phase. Just tips. A reader does not extract automatically that you are modifying 3 amplifiers just for use with 2 channels. You also mentioned an active setup I think?!Direct coupled = DC coupled.
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Ok I am fed up with it. You modify dogmatically without even knowing the original circuit. Someone else needs to point you to the caps in series. You start about the coils being the "real cause of lack of bass" when in the circuit you posted it are the caps for sure being a factor.
In THIS device it IS a factor as the value is too small (1 µF in series with 2.2 µF = ?). In devices where you removed them they can not be a factor.
In THIS device it IS a factor as the value is too small (1 µF in series with 2.2 µF = ?). In devices where you removed them they can not be a factor.
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