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In Reply to: RE: Phase Shift posted by sideliner on August 02, 2017 at 09:16:37
The -3dB point isn't the issue. I was referring to phase shift in the midrange. Note that this is only occurring in the lower section, so it represents an undesired phase differential between the two outputs of the splitter.
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Buy Chinese. Bury freedom.
Edits: 08/02/17Follow Ups:
I wasn't aware that such a situation could occur within the passband from a first order cut-off filter. Can't argue with the sim results though. Having said that, the phase shift at 10 KHz is only 2 deg which is probably less than what is imparted to the signal by the OPT at that frequency. I guess the effect could be cumulative leading to distortion and higher order harmonics at a range where the ear is sensitive.
If you don't mind, could you please post a sim with a 1 uF or 1.5 uF capacitor? Just curious to see the difference.
"the phase shift at 10 KHz is only 2 deg"
As shown in the graph, phase shift at 10 kHz is nearly 90 degrees. It won't change much with a 1u cap.
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Buy Chinese. Bury freedom.
I stand corrected, I saw the deviation from 1 KHz to 10 KHz as a 2 deg difference - which it is, not realizing that it's centered at 90 Degrees across the entire passband.
Edits: 08/02/17 08/02/17
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