Feel free to provide one.
I don't think one is needed, we both know the purpose of proper ammount of smoothing.
Feel free to provide one.
Which one did you test? 20 msec or 100 msec GD?
I downloaded 3 samples from your page and took time to listen to them. I can't do a proper blind test as I'm using Volumio and foobar doesn't work well as UPnP controller, however I found the difference between the files not so hard to spot. I would describe it as the main bass drum kick was "thinner" and like it lost part of low energy kick while in the original the kick sounds "mightier" and deeper. I also heard difference in the higher drum kick which also became "thinner" and with less snap when GD is introduced.
Oh, in sighted headphone listening, the 100 was very easy to tell.100ms only. It was difficult.
Did you listen to speakers or headphones?
To speakers. I needed to crank it up to produce app 85-90dB at my LP to be able to hear the difference.
@Kvalsvoll , @amirm , does my subjective description of difference matches your perception?
Yes, the 100 msec file had anemic/different bass. The 20 msec was close to original but I thought the difference was there as well. I did not get a chance to do a blind test though.@Kvalsvoll , @amirm , does my subjective description of difference matches your perception?
Yes, the 100 msec file had anemic/different bass. The 20 msec was close to original but I thought the difference was there as well. I did not get a chance to do a blind test though.
I thought the levels were also different but did not investigate that much.
Yes, the 100 msec file had anemic/different bass. The 20 msec was close to original but I thought the difference was there as well. I did not get a chance to do a blind test though.
I thought the levels were also different but did not investigate that much.
That's my impression as well and it underlines that group delay / phase issues are basically of minor significance, yet not completely irrelevant. It's the icing on the cake so to say. IMO it should *not* be a primary design goal to strive for linear phase at the cost of other parameters of potentially higher relevance. Trimming a well designed multiway speaker to linear phase is trivial these days anyway, with DSP power available in any PC etc.One aspect worth noticing is that even the horrible delay of 100ms does not destroy sound quality in a way that makes it worthless to listen to. At low volumes, if you can not compare directly, the difference will be hard to notice.
Here is how reflections influence GD (and everything else related to time domain):
red - no windowing (sweep taken at LP app 4m from speakers)
green - 2ms IR window
blue - 5ms window
beige - 10ms window
View attachment 31745
Where (on which menu) do you control the length of the window?
Seems like the group delay for after treatment has less deviation from 0 ms. By the way why does group delay goes to negative? Is 0 ms just reference not absolute?on reflections influence GD I have this.
same speaker, same room. green: no treatment, violet: after treatment (only the speaker position is a little different afair).
no smoothing/windowing
View attachment 66582
Seems like the group delay for after treatment has less deviation from 0 ms. By the way why does group delay goes to negative? Is 0 ms just reference not absolute?
Seems like the group delay for after treatment has less deviation from 0 ms. By the way why does group delay goes to negative? Is 0 ms just reference not absolute?
GD is just the derivative of phase, which means it will be a negative number when phase turns in the negative direction.