The world is awash with power amplifiers containing toroidal transformers. I get they have higher efficiency, lower EM Stray field , lower weight and probably lower impedance but I really don't get why EI are not used more in power amplifiers.
I must be one of the few who actually prefers the sound using EI transformers. And yes, believe it or not I can tell the difference. I know transformers are never made equal but EI sounds much more natural and unforced than toroidal which seem to sound nasal and angry to my ears I even prefer my small EI transformers to some custom made Canterbury vwindings toroidal with inter winding shield and goss band. Must be something to do with the lower capacitance between windings that blocks crap on the mains.
My power amplifiers have remote power supplies so stray field is not a problem. I still prefer the EI. Am I alone in my preference or just wierd ?