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[V4A][IRS][DDC]103 Headphone correction IRS/DDC filters--2016-06-05 5 new HiFi models

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By Joe0Bloggs, Senior Member on 21st July 2013, 06:58 PM
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26th July 2013, 07:14 PM |#141  
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Not sure how all this Voodoo magic works but is there a way you could show me how this IRS looks on the graph please? http://db.tt/IhIy7pfN

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26th July 2013, 07:40 PM |#142  
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Quote:
Originally Posted by bobdoblo

Not sure how all this Voodoo magic works but is there a way you could show me how this IRS looks on the graph please? http://db.tt/IhIy7pfN

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You mean the frequency response graph?


About 7.5dB of boost is recording in the irs centred around 120Hz. Note that this IRS was recorded rather hot and may clip (distort) if the Gain setting (2nd from the bottom of the V4A menu) is not set to some negative value
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26th July 2013, 07:50 PM |#143  
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Quote:
Originally Posted by Joe0Bloggs

You mean the frequency response graph?



About 7.5dB of boost is recording in the irs centred around 120Hz. Note that this IRS was recorded rather hot and may clip (distort) if the Gain setting (2nd from the bottom of the V4A menu) is not set to some negative value

Yes, excellent, thats what i have to do, set negative gain.
Its my favourite sounding IRS on Soundmagic e10 but its got too much somewhere and i needed to see where, because i couldn't accurately tell where it was.
Would you be able to flatten that "hump" by about 5dB, i still want the lowest bass at same level though.
Please?

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26th July 2013, 08:50 PM |#144  
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How to record your own simple headphone correction profile IRS!
(this ReaPlugs ReaFIR plugin makes drawing EQ curves a breeze! It's a linear phase EQ though, when ideally for headphone correction we want a minimum phase EQ. I use a different VST EQ module called Electri-Q, it's not so easy to plot the curve the way you want on it but I hope the difference in quality is worth it There are some caveats to this curve drawing that you may run into but I don't know how to summarize this--if you run into trouble I'm more than willing to help Just hope to see you share your completed IRS here in this thread, they will be added to the collection with your permission and credited to you in the filename )

1. Download Audacity and _32 bit_ version of Reaper ReaPlugs
audacity.sourceforge.net
http://cockos.com/reaper/reaplugs/re...21-install.exe

2. Install Audacity with default settings. Install ReaPlugs in Program Files (x86)\Audacity\Plug-ins (I tested this by deleting the \VstPlugins subfolder the installer automatically appended to the directory name while installing, I don't know if this is necessary)

3. Open Audacity and it should automatically scan and find the ReaPlugs vst plugins. If this is not your first time running Audacity go to Edit->Preferences->Effects->check Rescan VST effects and close and restart Audacity to load the ReaPlugs.

4. Generate a track of 30s of silence. Generate->Silence

5. Press Ctrl+mouse scroll upward on the sound track to zoom all the way in to individual sound samples

6. Use the pencil tool to draw on the sound track and bring one single sample of sound to the ceiling. This creates a perfect impulse.

Then click on a blank area of the track header on the left. This selects the whole audio track for effects processing.

7. Open ReaFir by choosing Effect->Cockos: ReaFir (ReaPlugs Edition)

8. Change the top and bottom dB limit of the vertical scale to a smaller range so that you can plot more precisely. For example, with a -10 to 10 range the app conveniently puts scale lines at 5dB intervals, matching the 5dB scale on some headphone measurement sites. (although many graphs require a larger range than -10 to 10)


9. Plot an upside down version of the headphone frequency response graph you found for your model of headphone Take care to plot the points at the correct x and y positions For example, note that most measurement graphs only go down to 20Hz but the graph on ReaFir goes down to 0 Also the scale from 10-20kHz is wider on ReaFir. When you press and move a point around you'll see a box showing the current frequency and dB amplitude so look at that to make sure you're putting the point at the right place


IMPORTANT NOTE: most headphones will have a big dip in the graph somewhere or fall off a cliff at the bass or treble end of the scale. You should not draw the curve exactly as the inverse upward cliff at these points--because the taller your graph in the vertical scale (the larger the scale of frequency response correction applied), the more negative gain needs to be applied at the next step to prevent clipping. I have received consecutive reports of people following this tutorial to the letter and producing graphs that span 30+dB of vertical scale. The resulting IRS are so quiet as to be unusable. Please keep this in mind when following this step. Note the maximum volume you have had to push your device to drive your headphones when no effects are applied and think about how many dB of volume you can afford to lose when applying the IRS, and take the downward plunges of the graph with a grain of salt when plotting the corresponding upward compensations. A rule of thumb is your graph should never go up more than 10dB above the zero line.

10. Take note of the dB value of the highest point of the graph and set the output gain to the negative value of it

As noted above this will make music convolved by this IRS quieter by as many dB. If you find yourself applying an unreasonable value here review what you've done in step 9 and revise the curve as necessary.

11. Save your work with the Save button on top, then press OK to run the filter on the sound track!

12. The impulse would have moved some way down the track after the processing. Zoom out by pressing Ctrl+mouse scroll down on the track to find the location of the impulse.

13. Select 16384 samples of the track with the impulse centred on it by clicking somewhere to the left of the impulse and then setting the selection length to 16384 samples. Might take you a few tries to find the right position (click on the drop-down menu to select "samples" first)


14. Select Edit->Copy to copy down the 16384 samples then delete the whole audio track

Then select Edit->Paste to end up with just the 16384 samples of audio with the impulse centred on it.
Then select Edit->Duplicate then go to the context menu for the first audio track and select "Make Stereo track" to end up with left and right channels playing the same impulse.


15. Select File->Export; under "save as type" choose "Other uncompressed files" and click options...
Choose header to be wav (microsoft) and encoding to be... well I've been using signed 32 bit pcm so far but you may try 32 bit float as well and see if that works

16. Hit save, rename the wav file produced with .irs suffix, put it on your android and enjoy!
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26th July 2013, 08:51 PM |#145  
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Now that I'm addicted to this. Could you make 2 more please. Senn HD280 and HD650.

Thanks mate
26th July 2013, 09:05 PM |#146  
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Quote:
Originally Posted by bobdoblo

Yes, excellent, thats what i have to do, set negative gain.
Its my favourite sounding IRS on Soundmagic e10 but its got too much somewhere and i needed to see where, because i couldn't accurately tell where it was.
Would you be able to flatten that "hump" by about 5dB, i still want the lowest bass at same level though.
Please?

★NeatROM★ Mods + Battery Tips

Anything for my no.1 supporter and donor
https://www.dropbox.com/s/5uekkze5e1...eo-flatter.wav
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26th July 2013, 09:23 PM |#147  
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Quote:
Originally Posted by Joe0Bloggs

About 7.5dB of boost is recording in the irs centred around 120Hz. Note that this IRS was recorded rather hot and may clip (distort) if the Gain setting (2nd from the bottom of the V4A menu) is not set to some negative value

Any suggestion as to how much to attenuate based on your impulse files?

I am currently doing a -6dB on output gain, maybe its a little on the low side. The soft limiter on the output sounds pretty good even if you drive it a bit, and attenuating with the playback gain control seems to be another option. I believe if max gain is set to 1x the agc should behave like an attenuator.

--
Really loving the Koss PortaPro profile right now, sounds like another set of cans!
26th July 2013, 09:34 PM |#148  
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Quote:
Originally Posted by nereis

Any suggestion as to how much to attenuate based on your impulse files?

I am currently doing a -6dB on output gain, maybe its a little on the low side. The soft limiter on the output sounds pretty good even if you drive it a bit, and attenuating with the playback gain control seems to be another option. I believe if max gain is set to 1x the agc should behave like an attenuator.

--
Really loving the Koss PortaPro profile right now, sounds like another set of cans!

I try to set the level of my irs presets intelligently so that 0dB gain would not clip with most program material. If the highest part of the EQ is in the bass I strictly enforce the below 0 dB rule for the EQ graph; if the highest part is in the treble I let it peek through the top a little as program material seldom saturates with treble energy.

Glad you like it
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26th July 2013, 10:14 PM |#149  
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Quote:
Originally Posted by Joe0Bloggs

Anything for my no.1 supporter and donor
https://www.dropbox.com/s/5uekkze5e1...eo-flatter.wav

:thumbup:

Cheers mate!

Edit, can't test at minute but its in .wav not irs, does that matter?

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26th July 2013, 10:20 PM |#150  
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That open up a world of possibilities
It is simpler with Reaper than with Electri-Q!

Instead of clicking on a graph, do you know if there is a way to load a spectra from a text file (with column 1: Hz; column 2: dB) in one of the plugin a Audacity ?
26th July 2013, 10:25 PM |#151  
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Quote:
Originally Posted by bobdoblo

:thumbup:

Cheers mate!

Edit, can't test at minute but its in .wav not irs, does that matter?

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I exported it the same way as always, just forgot to rename the suffix this time It should totally work if you rename the suffix, if you have any problems, let me know

Quote:
Originally Posted by NicoGa

That open up a world of possibilities
It is simpler with Reaper than with Electri-Q!

Instead of clicking on a graph, do you know if there is a way to load a spectra from a text file (with column 1: Hz; column 2: dB) in one of the plugin a Audacity ?

Not that I know of... but before that, do you know of any review site that publishes frequency response in table format?

Edit: btw, I haven't uploaded your last hd518 irs to my collection just yet because I find that it may have been clipped and also a spectrum analysis shows you put a big spike past 10kHz... it's true that there's a big dip in the FR graph there but putting such a big spike in the correction EQ will overstress the drivers and cause them to distort and / or cause the digital signal to clip
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