Amplifiers with IcePower 1200AS2, class D module

JohnR · « **Reply #220 on:** 30 Dec 2018, 03:00 pm »

Um, I have no idea why laboratory testing of speakers is relevant, but the impedance of the load swamps the output impedance of the amp. (Again, you're not reading the graphs.)

maty · « **Reply #221 on:** 30 Dec 2018, 03:14 pm »

To finish, with class A or AB the phase is constant, FIX. All is EASY.

But with class D the phase varies and too much in IcePower modules. We have other variable in the equation, the phase. And the x(f,phase) too.

Then you can use a class D amplifier only in the frequency band where phase is constant or almost. Icepower 1200AS2 only f < 500 Hz. Ideally with a subwoofer but not with a woofer or, much less, with a tweeter!

JohnR · « **Reply #222 on:** 30 Dec 2018, 03:23 pm »

You don't know what the graph means. So yes, if "finish" means stop, then please do that.

maty · « **Reply #223 on:** 30 Dec 2018, 03:31 pm »

Again, amplifier is like an ideal source and impedance.

The graphs are the measures of this impedance, aka the amp (ideal source do not have impedance). Varations of frequency, phase and amplitude.