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EQ advice
morst:
--- Quote from: kuba e on October 21, 2020, 12:27:56 AM ---Thank you Morst for explanation and schematic. Perhaps I understand what you mean. Dividing the signal into two drivers causes problems in the frequency range where the two drivers overlap. Comb filtering can occure in this frequency range in the room. And it is possible to hear it.
But EQ only works with one signal. There cannot occur comb filtering. I don't know if anyone can hear this little phase shift caused by the equalizer. I can't even think of a way to test it. Maybe by listening to standard eq and linear eq. But linear eq brings some artefacts into the signal. The comparison would be inaccurate.
--- End quote ---
Interesting points about comb filtering.
I'm not primarily looking at it from the perspective of comb filtering, I'm just trying to simplify the ideal signal path to result in less distortion, including phase distortion or as I said, group delay
I recently (the past 5 years) started learning the science of Meyer SIM and Rational Acoustics SMAART analysis systems, and one goal of system optimization seems to be flattening out phase artifacts at the perspective of the listener.
Intuitively to me, providing a signal to an optimized system which has been time smeared is not as ideal as providing one which has not.
I hope this is informative and not overly confusing. The stuff I'm learning on the subject is somewhat mind blowing, so I'm sure I don't understand it all, and I love discussing it because it helps me to understand more.
Here's a good intro video with Merlijn Van Veen of Meyer Sound, posted in may 2020.
https://youtu.be/cfhqHxod9D0
Gutbucket:
I suspect one of the reasons I don't like high-pass filtering as standard procedure and use it only when necessary, even when listening on systems that don't really have deep bass extension, is the repercussions of excessive group delay imposed by the filtering. But that's little more than a hunch. Would love to really know.
I've a few recordings where the bass behaved really oddly. In general they were outdoors with big PAs. Plenty of apparent level yet sounds odd, weak, and mismatched to the rest of content. I think those have to do with my recording accurately capturing a particularly bad subwoofer alignment of the PA. But again.. little more than a guess.
[edit- thanks for the Meyer link, Morst, looking forward to checking that out]
kuba e:
Thanks to Morst and Gutbucket. I see I have joined the discussion that is not as simple as it seemed to me in the beginning. These are very interesting things. I'll watch this video.
morst:
--- Quote from: kuba e on October 22, 2020, 02:31:30 PM ---Thanks to Morst and Gutbucket. I see I have joined the discussion that is not as simple as it seemed to me in the beginning. These are very interesting things. I'll watch this video.
--- End quote ---
Honestly, even the intro video might even be too advanced and nebulous to really apply to the topic of this thread, but I wanted others to have access to the same info that I do. I would love to hear comments and try to answer questions about it... But since this is an EQ thread, let's discuss the Meyer videos in a thread I made about them:
https://taperssection.com/index.php?topic=195145.0
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