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Class D Switching Power Amplifiers and Power D/A conversion

Phase shift in class D amplifiers. How it affects the sound?
Phase shift in class D amplifiers. How it affects the sound?
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Old 17th April 2018, 08:39 PM   #11
maty tinman is offline maty tinman  Spain
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Relative phase is audible, depending on the amount, the frequency and the context. Two speakers side by side with 90 phase shift between them will sound dreadful - and the sound will change as you move about. The relative phase of two musical instruments playing in harmony makes the sound you hear - take away the phase shifts, and it will sound flat and lifeless.
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Old 18th April 2018, 03:11 AM   #12
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I've simulated the wave file as source and saved R1 voltage as wave file again. That's typical H-bridge LC filter, suitable for most popular Ti amps. 20kHz -40deg. Anyone hear the difference original vs simulated?
Diana Krall_1.wav — Yandex.Disk
Diana Krall_3.wav — Yandex.Disk
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Old 18th April 2018, 05:32 PM   #13
maty tinman is offline maty tinman  Spain
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Easy. With foobar2000 and JRMC 64 bits.

One sound more "natural" or "credible", with more "body" than other.
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Old 18th April 2018, 05:38 PM   #14
5th element is offline 5th element  United Kingdom
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I would like to point out that in the original post the graphs of phase are the electrical phase of the loudspeakers. This has absolutely nothing to do with the acoustic phase shift of the drivers + crossover combination.
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Old 21st April 2018, 08:26 AM   #15
maty tinman is offline maty tinman  Spain
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Is anyone else encouraged to make the test?
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Old 21st April 2018, 02:47 PM   #16
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Originally Posted by 5th element View Post
I would like to point out that in the original post the graphs of phase are the electrical phase of the loudspeakers.

...
Yes, the second and third are of the magnitude and phase of speaker impedance.

The first is the output impedance and the phase of that output impedance of the "IcePower 1200AS2 class D module".

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Originally Posted by 5th element View Post
...This has absolutely nothing to do with the acoustic phase shift of the drivers + crossover combination.
Yes again
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Old 3rd May 2018, 01:55 PM   #17
maty tinman is offline maty tinman  Spain
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Two weeks elapsed from my email to Icepower and there is no answer.

Phase shift in class D amplifiers. How it affects the sound?
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Old 3rd May 2018, 02:21 PM   #18
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Originally Posted by maty tinman View Post
Is anyone else encouraged to make the test?
Yes. No audible difference for me.
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Old 4th May 2018, 07:29 PM   #19
maty tinman is offline maty tinman  Spain
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Thank you for the answer.

It seems that the subject does not interest. The absence of more comments makes me more intrigued by the phase shift in the audio band. Class D technology.
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Old 4th May 2018, 07:34 PM   #20
maty tinman is offline maty tinman  Spain
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Last edited by maty tinman; 4th May 2018 at 07:38 PM.
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