MAC Autoformers?

I am confused. I get using autoformers on high output impedance tube amps.  The autoformes will make the amp think it is driving a higher impedance speaker load and thereby improve the damping factor, make the load easier for the tube amp to drive and may smooth out the FR of the speaker.

But why would one use an autoformer on a high quality, stable, hog wattage SS amp.  These beasts were (should be designed) to handle demanding speaker loads.  I surmise that most speakers on the market today were voiced to be driven by a high current capable voltage paradigm SS amps.

Maybe autoformers make sense on super low impedance electrostats,but I'd be careful on the front end in matching up any amp to a super low impedance electrostat.  Make it easy in yourself and just short the amp's output terminals and call it a day.   :)

Please explain? 

+1erj1953 well said.

Thanks Ralph for the explanation and clarification.

bifwynne
I am confused. I get using autoformers on high output impedance tube amps. The autoformes will make the amp think it is driving a higher impedance speaker load and thereby improve the damping factor, make the load easier for the tube amp to drive and may smooth out the FR of the speaker.

But why would one use an autoformer on a high quality, stable, hog wattage SS amp. These beasts were (should be designed) to handle demanding speaker loads. I surmise that most speakers on the market today were voiced to be driven by a high current capable voltage paradigm SS amps.

It’s simple! It’s two things, a gimmick, or a band-aid for gutless amps that can’t drive those loads.

It’s not a patented idea, all you you have to do is to look at how many other "well known" well designed solid state hiend amp maker use output transformers? A BIG ZERO, if they did it was as a gimmick or an aid for that amp to drive speakers they normally couldn’t.

Why do good OTL’s tubes not use them on speakers they’re comfortable with?? BECAUSE THEY SOUND BETTER WITHOUT THEM (Ralph), so long as the speaker load is ok for them. The moment the load get’s too difficult for them with other speakers then they’re better using an autoformer, I would change the amp instead.


Cheers George