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Classic gear from yesteryear; vintage audio standing the test of time.

RE: Hegeman Hapi 2 is inverting or not?

OK, it is true that there is an absolute phase. That is to say that the waveform emitted by a musical instrument has a phase and that it is best that the reproducing equipment adhere to that phase.

The number of inversions of phase in a CD player, preamp or amp makes absolutely NO difference to the outcome of absolute phase at the listening position because there is no guarantee that the CD was even recorded in absolute phase. There could be dozens of amplifiers in all the signal processing done in modern recordings from the microphone to the input to the ADC. For absolute phase to be adhered to every one of these devices in the signal chain would have to be non inverting and that clearly does not exist in the real world. Further, if there are multiple instruments and voices, each of these tracks would have to have an identical signal chain and each would have to be non inverting. If this makes any sense to you, it should be clear that this is entirely fantasy.

In reality, phase is a random thing and there is a 50/50 chance the phase is correct at the speakers, probably having been inverted dozens of times between the original waveform and the sound emanating from the speakers. And again, if there are multiple instruments the chances are that some will be in phase with each other and some will be out of phase. In other words there is mixed phase among the instruments so there is NO actual absolute phase.


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