Looking at the table of First Watt amplifiers I see that single-ended designs almost always produce less power into 4 ohm compared to 8 ohm, while push-pull designs produce more. Is this inherit to the topology? If so, what is it that causes this behavior?
hardly worthy opening new dedicated thread 
I mean - all of that is related to issues presented in your recent/actual thread
yes,
yes,
topology, what else.
I mean - all of that is related to issues presented in your recent/actual thread
yes,
yes,
topology, what else.
I'm just reading your last comment on my other thread where you mention the Babelfish J. I wanted to generalize so my question was about SET amps in general, not just the Aleph.
My core question then is, what is it about SET topology that prevents it scaling into lower impedance loads? I take it this line is key:
"catch with Aleph is that OS can't leave A class envelope and it can give approx twice Iq to load, so Iq must be substantial, comparing to some other FW amps, being able to leave A Class envelope "
Which I still only half understand. Are you saying that something like the F6, which I see rated at 25w@8ohm/50w@4ohm must leave Class A to achieve that 50w output?
(Thanks for following me around answering my questions, you're absolutely a bro 🙂 )
My core question then is, what is it about SET topology that prevents it scaling into lower impedance loads? I take it this line is key:
"catch with Aleph is that OS can't leave A class envelope and it can give approx twice Iq to load, so Iq must be substantial, comparing to some other FW amps, being able to leave A Class envelope "
Which I still only half understand. Are you saying that something like the F6, which I see rated at 25w@8ohm/50w@4ohm must leave Class A to achieve that 50w output?
(Thanks for following me around answering my questions, you're absolutely a bro 🙂 )
yes
roughly - if F6 (and similar) amp is having both rails and Iq set to have XX Watts/8R, and capable to transit in B Class to achieve (ideally) 2*XX Watts/4R, be sure that A Class envelope is "just" XX/2 Watts/4R
some imprtant things explained in KLUNK! related articles :
- https://www.firstwatt.com/pdf/art_leave_classa.pdf
- https://www.firstwatt.com/pdf/art_leaving_class_a_2019_redux.pdf
but N.B. that these are in origin at FIRST WATT , which is nice source for at least year's worth of enjoyable evening reading