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And of course SMPS always have (relatively) fast edges at the switching devices. It seems like it might have been tricky to have enough filtering at the SMPS output that high frequency noise did not feed through the AB output stage, but also enough bandwidth in the control loop that the power supply changes could stay ahead of the audio signal. Possibly helped by the amplitude of the signal being primarily controlled by low frequency amplitude (assuming full range signals, i.e. not using one of the amps for just the tweeter signal of a really big tri-amped PA).Yeah, I wonder if Lab Gruppen even bothers with that topology now. It sounds like it was an attempt to work around high distortion and out of band noise in early class D output stage designs.
And of course SMPS always have (relatively) fast edges at the switching devices. It seems like it might have been tricky to have enough filtering at the SMPS output that high frequency noise did not feed through the AB output stage, but also enough bandwidth in the control loop that the power supply changes could stay ahead of the audio signal. Possibly helped by the amplitude of the signal being primarily controlled by low frequency amplitude (assuming full range signals, i.e. not using one of the amps for just the tweeter signal of a really big tri-amped PA).
Yeah, I wonder if Lab Gruppen even bothers with that topology now. It sounds like it was an attempt to work around high distortion and out of band noise in early class D output stage designs.
