MAC Autoformers?

Thanks unsound. I think your link makes a good case for autoformers.

….Because despite the never ending reports over the last 50 years of the amps not using autoformers  overheating, destroying speakers and causing fires, consumers keep buying them in such vast quantities as to provide a huge and continuing to grow sample size for such inspection?

@unsound

Could the impedance swings of the Magico S5 explain the poor linearity - see deviation from linearity plot showing loss of SPL from the tweeter?


https://www.soundstage.com/index.php?option=com_content&view=article&id=1043:nrc-measurements-magico-s5-loudspeakers&catid=77&Itemid=153

The crossover is at 2KHz and the sensitivity would have been matched at that point to the mid range. Note the impedance is quite high at 2KHz and drops rapidly above 2KHz - perhaps the crossover design may not be ideal as the revalator tweeter resonance is much lower (500Hz).

It seems you are consistently more interested in the technical data on hifi equipment that I'll bet determines what system or systems you own and like.  

Do you ever throw care to the wind and just trust your ears?

I alwasy do both Pops. As do all designer of good amps, without bench testing, laws of electronics, tech data, if you bought such an amp off some who doesn't do these you'd have a pile of junk. 

Cheers George

I am going all out to prove my ignorance and ask a question on autoformers.

I suppose we all agree that one advantage of autoformers is to deliver the same amount of power regardless of variations in a given speaker impedance curve.

So here is the question: a speaker with huge variation in impedance curve will receive considerably more power where the impedance deeps way below its average curve, and if that speaker in fact receives more power at certain frequencies then those frequencies will be greatly highlighted, so there goes your flat response!

Yes? No?