What happens when you Class A the L/R channels but not the ground ?

[ozshadow]

For L/R, the amps using an opa 2107 through a buf634 on each. I can class A these two using a CRD on each.

What happens if I do not class A the opa627/buf634 on the ground channel ?

 

[tomb]

At least on the PIMETA, the amplified ground channel is not externally biased.

 

[Xakepa]

As far as I understand it, the whole idea of biasing is to avoid crossover distortion. As the ground channel is allways at zero potential there's no crossover "distortion" - ground is at the crossover point all of the time. The goal of "buffered/amplified ground" is to minimize output resitance.

Sound good to me