My NAD C515BEE is finished.............

[nad]

Originally Posted by mikesnowdon

where did you read this?

Here... Upgrading OPA2604 in a Fubar II USB DAC

[Andrea:]

Originally Posted by nad

Any experience?

Yes, it was in a CDP and in a DAC I had and it sounded good.

But the point is improving on an NE5532 without throwing the musicality away... and that's why I suggested the very good OPA132UA. Also the OPA2132P is quite good but the OPA132UA is better enough to justify the Browndog.

[nad]

Originally Posted by Andrea:

Yes, it was in a CDP and in a DAC I had and it sounded good.

But the point is improving on an NE5532 without throwing the musicality away... and that's why I suggested the very good OPA132UA. Also the OPA2132P is quite good but the OPA132UA is better enough to justify the Browndog.

OPA132UA SMD and single pole?

[mikesnowdon]

Originally Posted by nad

Here... Upgrading OPA2604 in a Fubar II USB DAC

Ive heard of that but not tried it. Most of the time the opamp will have supply decoupling caps very close so I don't see any point in adding the extra cap. Give it a try though. Bear in mind this isn't likely to solve the tonal balance issue. Get that sorted first.

[Andrea:]

Originally Posted by nad

OPA132UA SMD and single pole?

Yes, a single SMD opamp, so what you need is the Browndog adapter for two single SMD chips. I believe you would be pleased at the improvement over the LM4562 in terms of musicality and fullness of sound, maintaining a high detail resolution.

[nad]

Originally Posted by Andrea:

Yes, a single SMD opamp, so what you need is the Browndog adapter for two single SMD chips. I believe you would be pleased at the improvement over the LM4562 in terms of musicality and fullness of sound, maintaining a high detail resolution.

I went for what Brent at Audioupgrades recommends, the 4562's.

[nad]

Originally Posted by mikesnowdon

solve the tonal balance issue. Get that sorted first.

Will try to. I'm going to swap back the feedback caps first, then try a 100uf in their place and if it brings it back, then good stuff, If not, I'll revert the signals and so on until the bass comes back.

[Andrea:]

Originally Posted by nad

I went for what Brent at Audioupgrades recommends, the 4562's.

It is not a bad opamp, for sure. Although I couldn't bear it in my DAC for a long time, just where I've found the LT1028CS8, OPA132UA, and LME49723, to be the best sounding together with the LME49720HA. And I included OPA211 and OPA827 etc. in my testing.

The LM4562 always remained one step behind (even two steps when referring to the LT1028). It was a bit lean (leaner than the LME49723), a bit rough in the midrange, and a bit lacking treble sparkle (not presence...but sparkle) and overall sonic 'intensity' (the LME49723 sounded more intense, like the LME49720HA).

[nad]

Originally Posted by Andrea:

It is not a bad opamp, for sure. Although I couldn't bear it in my DAC for a long time, just where I've found the LT1028CS8, OPA132UA, and LME49723, to be the best sounding together with the LME49720HA. And I included OPA211 and OPA827 etc. in my testing.

The LM4562 always remained one step behind (even two steps when referring to the LT1028). It was a bit lean (leaner than the LME49723), a bit rough in the midrange, and a bit lacking treble sparkle (not presence...but sparkle) and overall sonic 'intensity' (the LME49723 sounded more intense, like the LME49720HA).

4562 or OPA2604??

[nad]

Originally Posted by Andrea:

It is not a bad opamp, for sure. Although I couldn't bear it in my DAC for a long time, just where I've found the LT1028CS8, OPA132UA, and LME49723, to be the best sounding together with the LME49720HA. And I included OPA211 and OPA827 etc. in my testing.

The LM4562 always remained one step behind (even two steps when referring to the LT1028). It was a bit lean (leaner than the LME49723), a bit rough in the midrange, and a bit lacking treble sparkle (not presence...but sparkle) and overall sonic 'intensity' (the LME49723 sounded more intense, like the LME49720HA).

Doesn't it all depend on the rest of your sytem? do you mind me asking what you have?? I wouldn't have thought there would be a huge difference when afterall it's a budget setup and there are other areas which aren't upto scratch.