Op Amp Rolling

[SIY]

Lower supply voltage tends to increase sonic differences IMO.

What evidence do you have for this? It seems questionable.

 

[MaxwellsEq]

Running op amps on what is effectively +/-6v will/may compromise the performance and introduce audible defects.

The critical thing in your sentence is: "will/may". You are half correct: it may introduce defects, but you can't be certain that it will.

And this is the issue with op-amp rolling. Personally I would not do it because in general circuits are designed to support the active component and are optimised for frequency response, noise or distortion. Change the active component and who knows what they are optimised for. Your point about rail voltages is valid - unless comprehensive before/after measurements are taken nobody can be certain that the op-amp will work optimally at these rail voltages.

 

[egellings]

Rolling a OP amp from a circuit that was designed and calculated for the OP amp that is in use from the factory is like shooting with a shotgun and hoping you hit something far away. I don't recommend OP amp rolling but if you want to go for it there are a ton of skills that can be gleaned from the operations. It's nice to see somebody going at it from a objective approach although we don't know what calculations the designer(s) performed while making this circuitry and any OP amp that would be swapped would be a guess at best.

An uneducated op amp swap could also turn your amplifier into an oscillator.

 

[antcollinet]

Lower supply voltage tends to increase sonic differences IMO

We don't do opinions here. If you don't have specific design details (component spec versus circuit design), or measurements, then "opinions are like assholes - everybody has one"

Sure - if you have a circuit that is designed to operate close to rails and you swap the op amp for one that can't do this, you are going to run into problems. This one of the many reasons why we suggest op amp rolling is both pointless, and may well result in problems.

But your blanket statement can't be taken at face value. like everything, the devil is in the detail.