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Adrian,

what do you see fundamentally appealing in the symmetry of the differential circuits and what the relations between Sound the symmetry? Not to mention that the perfectly symmetric circuits do not exists. I’m very far form the people who could credibly explain to you the advantages of SE design but the dynamic superiority (among many other things) of a properly built SETs well described in literature.  You may try a good SET running in A1 with appropriate speaker and you would see that nothing could stay next to no-feedback SETs dynamic-range wise.

Beside the electrical advantages there are some usability advantages the even larger. In order to increase the dynamic range for 3dB you need to double power of your amp. Boosting the power you gain of dynamic range but this gain would be slower then the dynamic range gain that might take place if your increased the dynamic range of your loudspeakers. So, keeping the power low and the sensitivity of the loudspeaker high you have more dynamic range then the powerful amps and low sensitively dull loudspeaker.

If you run many watts of the “symmetry of differential circuit” (even in Class A1) against 110dB sensitive load then you have the “dynamic range” (primary coming from the loudspeaker) but you will also “loose a lot of sound” into the complications of that differential circuit. At least it was my experience. Yes I have seen people who told me the “properly made PP” might be equal to SET but in ALL those cases the people confidence collapsed what there was the actual needs to DEMONSTRATE SOMETHING to back up their promises. Also, I have to say that I feel that something very positive lives in the transformer cores…

I think the biggest problem with SETs is the complete missing from market any more or less capable high-sensitively loudspeakers that good SETs might be used with. The manufacturers and designers go for power in SET not for Sound as they need to sell those Sets to the customer with 95dB sensitive speakers. The alternative for them is only the foolish domain of full-range drivers with own set of unresolvable problems…

Rgs,
The Cat

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