Thanks Pops. Good to know that there are others who have the confidence to judge with their ears.
MAC Autoformers?
Someone is selling a MAC MA6500 Integrated claiming its superiority over the Ma6600 due to the fact that "it does not have the degrading autoformer design found in the MA6600". That is the first time I've heard a claim that the autoformer was a hindrance to better performance; I thought quite the opposite. What do you MAC Maves think?
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http://roger-russell.com/mcintosh1.htm#autoformer What is failed to be mentioned is that with most loudspeakers as impedance decreases / sensitivity decreases and as impedance increases / sensitivity increases. So if the speakers presents an impedance that swings between the impedances of the taps there will be potential for corruption to the ouput linerity. |
@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). |
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