@atmasphere Perhaps my definition is too restrictive, but IMHO amp with one of speaker terminals at GND is not "Fully Balanced" Do you agree it is "Fully Balanced"? |
@kijanki It looks like that amp is. But: I would not use a speaker terminal at ground as your definition, although our OTLs have both speaker terminals ungrounded and floating. Many ARC amplifiers do not have a grounded 'common' terminal; the impedance to ground of the common connection is the same as their 16 Ohm connection. IOW that is not the defining character of a fully balanced amplifier although it is a characteristic they are likely to have. We are experimenting with a tube amp that has a speaker terminal grounded, yet its fully balanced from input to output with dual feedback loops. |
@atmasphere Amplifier in question PS Audio S300 has only balanced input with single ended stages following. I don’t believe that adding, for instance input transformer, makes any amplifier "Fully Balanced". In my opinion such amp is an amplifier with true balanced input. |
@kijanki Did you not mean to use 'S300' twice in the above post? |
@atmasphere I replaced second "S300" with "such amplifier" to make it general. To me something that is "Fully Balanced" has all stages, including output stage, balanced. One criteria of balanced output is lack of GND return current. |
