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Headphone CSD waterfall plots - Page 49

post #721 of 937

Did a quick test:

 

csd_without_eq.png

 

csd_with_eq.png

 

Second plot shows the same headphones' CSD, but with a simple parametric EQ (one filter with a cut at 4300 Hz) applied to the signal used for the impulse response measurement.


Edited by xnor - 6/21/12 at 3:52pm
post #722 of 937

XNOR: simply well done!!

 

It also made me think I say something completely stupid just before ;). No way the ridge is going to split into two, the eq. filter and headphone resonance would have to be coupled (like a mass-spring added on top of another mass-spring to damp its resonance, but creating another one in the process...).

post #723 of 937

I want to see what happens to the waterfall plots if something like the iTunes EQ is applied.

post #724 of 937

Won't install iTunes again, but I wouldn't use that EQ anyway:

 

1000x500px-LL-009b694d_itunes-eq.png

 

results in

 

1000x500px-LL-0bf840f6_eq-fr1.png

 

And it's too imprecise to do anything but rough changes in overall balance.


Edited by xnor - 6/21/12 at 4:47pm
post #725 of 937
Thread Starter 

That's really scary. What's up with the steps on the Fb2k EQ? LOL, I would have to try hard to write a DSP routine like that. Why is Winamp so far off?


Edited by purrin - 6/21/12 at 5:18pm
post #726 of 937
Quote:
Originally Posted by purrin View Post

That's really scary. What's up with the steps on the Fb2k EQ? LOL, I would have to try hard to write a DSP routing like that. Why is Winamp so far off?

 

Yes. I guess the fb2k dev bought into the points on the SuperEQ library page, doesn't really care about it, didn't find a better implementation or doesn't know how bad it is. That's why I wrote a 31-band graphic EQ plugin that produces a smooth, minimum phase response.

 

I haven't looked at the implementation but I assume it's about as simple as it can get: ifft a frequency spectrum that corresponds to the EQ's sliders, voila, there you have a crappy linear phase, stair-step FIR filter.

 

I don't know why Winamp is so far off. I tried to configure the EQ as accurately as possible according to what the GUI says.

 

Anyway, this is getting off-topic so I'll stop here.

 

edit: btw, I don't remember if it was the iTunes or Winamp or Sansa Clip EQ, but at least one of those produces different results if applied on an impulse compared to a sweep or noise... in one word: broken.


Edited by xnor - 6/21/12 at 5:22pm
post #727 of 937

Is there any readily available software for CSD plots? Trial or freeware.

post #728 of 937
Thread Starter 

PureBits: http://www.purebits.com/

ARTA: http://www.artalabs.hr/index.htm

Praxis: http://www.libinst.com/index.htm

SoundCheck: http://www.listeninc.com/us/products/data_acq.html

CLIO: http://www.audiomatica.com/clio/home1.htm

REW: http://www.hometheatershack.com/roomeq/ (works for best for rooms)

WinMLS: http://www.winmls.com/

 

Oh never mind...

 

ARTA or Praxis may have a trial. No sure.


Edited by purrin - 6/21/12 at 5:39pm
post #729 of 937

Which one are you using for yours?

post #730 of 937
Thread Starter 

I wrote my own program to process the impulse response and visualize the waterfall plots. But I do the data acquisition via CLIO.

post #731 of 937
Quote:
Originally Posted by xnor View Post

 

Yes. I guess the fb2k dev bought into the points on the SuperEQ library page, doesn't really care about it, didn't find a better implementation or doesn't know how bad it is. That's why I wrote a 31-band graphic EQ plugin that produces a smooth, minimum phase response.

 

I haven't looked at the implementation but I assume it's about as simple as it can get: ifft a frequency spectrum that corresponds to the EQ's sliders, voila, there you have a crappy linear phase, stair-step FIR filter.

 

I don't know why Winamp is so far off. I tried to configure the EQ as accurately as possible according to what the GUI says.

 

Anyway, this is getting off-topic so I'll stop here.

 

edit: btw, I don't remember if it was the iTunes or Winamp or Sansa Clip EQ, but at least one of those produces different results if applied on an impulse compared to a sweep or noise... in one word: broken.

 

I use that and recommend it to people all the time. Never noticed it was you who wrote it.

 

Thanks!

post #732 of 937
Quote:
Originally Posted by LFF View Post

 

I use that and recommend it to people all the time. Never noticed it was you who wrote it.

 

Thanks!

 

And people wonder why some of us are scared to death of using EQ.  I've always had horrible sonic experiences in the past w/ most EQ programs with every tweak yielding some other negative effect I couldn't compensate for, in the end things just became a mess.  Seeing this and hearing LFFs work though has restored my faith in giving EQ another go.  Fortunately my primary rig is getting close enough via hardware synergy that any EQ will be kept to a minimum.


Edited by Anaxilus - 6/21/12 at 7:19pm
post #733 of 937
Quote:
Originally Posted by Anaxilus View Post

 

And people wonder why some of us are scared to death of using EQ.  I've always had horrible sonic experiences in the past w/ most EQ programs with every tweak yielding some other negative effect I couldn't compensate for, in the end things just became a mess.  Seeing this and hearing LFFs work though has restored my faith in giving EQ another go.  Fortunately my primary rig is getting close enough via hardware synergy that any EQ will be kept to a minimum.

That my friend...is the key!

post #734 of 937

I get confused reading back into this thread...specifically which EQ software program is the one that is recommended above that produced the better CSD profile?

post #735 of 937
Quote:
Originally Posted by slwiser View Post

I get confused reading back into this thread...specifically which EQ software program is the one that is recommended above that produced the better CSD profile?

 

Probably this one:

http://www.foobar2000.org/components/view/foo_dsp_xgeq

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