Infineon MA12070 Class D

[mamocel]

replaced the 1612 with 1656

Ok...Your choice...I thought you wanted to bypass them! Try it as is, or modify a board and compare the two...
In balanced mode the opa1612 is not used... direct signal on opa1632

 

[Radian]

I will try the Sparkos balanced output stage of my DAC directly to the marked points.
Next up will be a balanced Lampizator tube stage feeding the Chip.