If we were to use a small mains transformer in place of a line matching transformer to drive a speaker, would it work at all?

Are there differences in laminations or core materials that set them drastically apart?

I’m not expecting audiophile results but I figure just because mains is 50-60hz, doesn’t imply that the transformer won’t perform decently at higher frequencies.


1 Answer 1


For music if you de-rate for the lower frequencies present in audio it should ok. Strip-wound toroidial power transformwers have good performance across most of the audio frequency range.

If this is for voice only using a 120V power transformer on a 100V audio distribution line should work fine.

strip-wound cores have only one gap in the core, and it has a very large surface area, (being the surface area of the strip itself) E-I tranformers have a much smaller gap area, so the gap is more significant. for this reason strip-wound toroidial and R-Core transformers are to be preferred.

Eddy currents are proportional to voltage, so you should be fine.

Saturation is proportional to voltage/frequency, so if you need to send 25Hz on a 100V line you'll want a 200V or higher power transformer.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.