itunes polarity?

[stephen1212b]

Depending on the topology used audio amplifiers often invert polarity and if they are unbalanced are not included in any standard.

I remember a trick to get more apparent power out of an amplifier like the Haffler 500. If you invert the polarity going to the input of one channel (this needs to be done electrically not by switching the input wires unless the source is a floating transformer), and reverse the speaker wires on that channel polarity is maintained and consistent between the two channels, but internally one channel is inverted with respect to the other. Bass frequencies require the most power, are often percussive in nature and mostly mono appearing in both channels at the same time. By inverting one channel the bass transient power demand is split with one channel drawing from the positive power rail and the other from the negative at the moment of peak demand. This uses the stored power in all of the capacitors more efficiently. The result is a stronger more dynamic sound.