Opinion on Cs43122 in this schematic

[Microfast]

I have seen using a Cs43122 in a Pre/dec. Rotel :

After this DAC a TL072C, then the digital volume control and an output stage with a OPA2604 .

The strumental result: good until 16bit/44Khz, average on 24bit/48Khz. and up with spectrum noise floor clean but no lower that -130dB.

Integral resolution no better than 15.6 bit, S/N weighted 98dB ( the highest measured ) on the multichannel input ( also buffered with TL072C ).

Opinion ?

Can the TL072C be the reason of this result ?

Thanks and regards
Marco

 

[jean-paul]

TL072 is sonic poison. Replace them all for something decent like OPA2604 for better sound. Don't know if the measurements become better ( some will ) but it *will* sound better.

I suspect the digital volumecontrol has influence on the results ....

 

[Microfast]

Thanks for the answer.

The volume control is not done with the usual Cs3310 or PGA2311 but with two Toshiba Tc9482 .

The strange thing is that Rotel do magnify the use of the CS43122 and the OPA2604 and then between these good chips put several TL072C and some 5532.

I cannot understand this in a 3500 $ pre/decoder ...........

Regards
Marco

 

[jean-paul]

I cannot understand this in a 3500 $ pre/decoder ...........

I can. It saves some

 

[dmfraser]

TL072!!!

TL072s were state of the art for 1975. I cannot understand anyone passing audio through them now. Replace them with something decent. The OP275 is a good choice. Even the LM833.