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Romy the Cat wrote:

I lately have some reasons to think about optimum requirements for SET’s out transformer if the amp handles juts a narrows bandwidth. For instance let pretend that we have 2 monoblock and each of them drive: LF <100Hz and HF >100Hz. So, would it be possible to optimize a specific transformer to push an envelop of an each reproduced range?

Absolutely. Making a transformer for < 100Hz would mean to use a huge core and a fairly large airgap to get more inductance at a given standing current. This makes winding the transformer with low parasitic capacitance and low leakage inductance a problem that is increasingly hard to solve as size increases (though I believe S&B has a solution to that problem now).

Equally, if you make sure the Amplifier for > 100Hz does NOT RECEIVE any input below 100Hz (or at least an input that falls off progressively), meaning a line-level highpass or one build into the interstage coupling, then you can make the transformer relaively small with relatively few turns as it does not need to handle LF anywya, which makes getting low parasitic capacitance and low leakage inductance much easier.

Romy the Cat wrote:

If for instance, the amp that does not handle anything under 1000Hz would be benefited if to make it with an air core?

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