Just noticed this thread and while I'm a big fan of transformers myself, I wanted to address something which was said in the link in the original post:
When your amp drives a purely inductive component like a transformer, it does not see your speaker wild reactive loadings but instead it sees a very stable high impedance load from by the inductance of the transformer which does not fluctuate under load or frequency .
This is incorrect.
Transformers don't have any particular inherent impedance of their own and do not turn a varying reactive load into a stable load. What transformers do is reflect impedances. In other words, the load connected to the transformer's secondary is reflected to the transformer's primary and the source impedance driving the transformer's primary gets reflected to the transformer's secondary.
Impedances are reflected as the square of the transformer's turns ratio. If the turns ratio is 1:1, then the load impedance gets reflected to the primary by a factor of 1 and the amplifier sees the same impedance that it would otherwise. If you use a step-down transformer, say a 4:1, then the load gets reflected to the primary by a factor of 16. So the amplifier will see a nominal 8 ohm loudspeaker as a 128 ohm loudspeaker.
However it doesn't see a stable 128 ohm load. The varying, frequency dependent impedances of the loudspeaker all get multiplied so the amplifier still sees a load that varies with frequency.
And of course if you're using a 4:1 step-down, the amplifier's output voltage get stepped down by a factor of four (the turns ratio) so you need to make sure your amplifier has enough excess voltage gain to overcome the step-down transformer's loss of voltage gain.
Anyway, this isn't any sort of comment on the product itself. Just clarifying how transformers actually function.
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