replacing lme49720 for a bluetooth dac

[kinderspiele]

the dac currently uses two ak4493eq with one lme49720na. thinking of replacing 49720, considering couple choices, opa2228p, opa2604ap,and pair of opa627. for 627, i may need single to dual adapter, do you know where we can buy it? will pair of 627 really make big difference?

the current dac is too sharp, lost musicality, also some clear distortion over treble. any recommendations.

thank you very much.

 

[companyja]

Hello mate, this forum is a wrong place to ask since chip rolling is rather discouraged - if you don't have the proper tools to evaluate what your mod does to the audio (something that can measure THD/IMD/noise), then it's better to not touch the audio circuit - replacing a chip with a more expensive or even better measuring part of the same nature will not guarrantee an improvement in the output as circuits are designed around the parameters of the chips used - chances are you will decrease performance by blindly soldering some other chip in there. Putting two chips instead of one is also not something that is likely to make the audio better in a circuit designed for a single chip.

 

[kinderspiele]

Thanks for the replying. The main concern is the treble distortion. it is very annoying. not sure if i can solve the issue by simply switch ic chips. thanks

Hello mate, this forum is a wrong place to ask since chip rolling is rather discouraged - if you don't have the proper tools to evaluate what your mod does to the audio (something that can measure THD/IMD/noise), then it's better to not touch the audio circuit - replacing a chip with a more expensive or even better measuring part of the same nature will not guarrantee an improvement in the output as circuits are designed around the parameters of the chips used - chances are you will decrease performance by blindly soldering some other chip in there. Putting two chips instead of one is also not something that is likely to make the audio better in a circuit designed for a single chip.

 

[Count Arthur]

Which DAC is it, also what else is in the set-up, amp, speakers, headphones, etc?

If your set-up sounds too bright, or sharp, it is unlikely that the opamp in one component is the route cause. I would look towards the speakers or headphones before the "electronics". Variations in the sound signature of different speakers and headphones is typically far greater than that in DACs and amps.

The lme49720 is a well regarded opamp, good specs, etc. and I've had several bits of equipment that have contained one or more of them and had no complaints about them sonically. Within reason, the design of the circuit as a whole will likely have as much, if not more, influence on the perfomance of the finished product than the specific opamp or DAC chips used within it.

There was some previous discussion about opamp swapping here: https://www.audiosciencereview.com/forum/index.php?threads/anybody-op-amp-rolling.10563/

 

[kinderspiele]

thank you very much.

Which DAC is it, also what else is in the set-up, amp, speakers, headphones, etc?

If your set-up sounds too bright, or sharp, it is unlikely that the opamp in one component is the route cause. I would look towards the speakers or headphones before the "electronics". Variations in the sound signature of different speakers and headphones is typically far greater than that in DACs and amps.

The lme49720 is a well regarded opamp, good specs, etc. and I've had several bits of equipment that have contained one or more of them and had no complaints about them sonically. Within reason, the design of the circuit as a whole will likely have as much, if not more, influence on the perfomance of the finished product than the specific opamp or DAC chips used within it.

There was some previous discussion about opamp swapping here: https://www.audiosciencereview.com/forum/index.php?threads/anybody-op-amp-rolling.10563/

 

[Chuckser]

Hello mate, this forum is a wrong place to ask since chip rolling is rather discouraged - if you don't have the proper tools to evaluate what your mod does to the audio (something that can measure THD/IMD/noise), then it's better to not touch the audio circuit - replacing a chip with a more expensive or even better measuring part of the same nature will not guarrantee an improvement in the output as circuits are designed around the parameters of the chips used - chances are you will decrease performance by blindly soldering some other chip in there. Putting two chips instead of one is also not something that is likely to make the audio better in a circuit designed for a single chip.

If you look at the measurements of the Topping DX7 Pro (THD+N v Freq @ 48Khz (90kHz BW) that uses the same op-amps it is apparent what our friend is referring to.

If the op-amp you roll is within spec then the problem you refer to shouldn't be an issue.

 

[Chuckser]

the dac currently uses two ak4493eq with one lme49720na. thinking of replacing 49720, considering couple choices, opa2228p, opa2604ap,and pair of opa627. for 627, i may need single to dual adapter, do you know where we can buy it? will pair of 627 really make big difference?

the current dac is too sharp, lost musicality, also some clear distortion over treble. any recommendations.

thank you very much.

Have you considered some discrete op-amps. Expensive but possibly worth it. Be sure they are within spec.