Opinion on Cs43122 in this schematic - diyAudio
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Old 4th January 2004, 11:54 PM   #1
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Default Opinion on Cs43122 in this schematic

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 ?

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Marco
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Old 5th January 2004, 09:21 PM   #2
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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 ....
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Old 5th January 2004, 09:56 PM   #3
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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 ...........

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Marco
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Old 5th January 2004, 10:11 PM   #4
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Quote:
I cannot understand this in a 3500 $ pre/decoder ...........

I can. It saves some
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Old 8th January 2004, 12:24 AM   #5
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Default 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.
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