Is this a general example or already customized for my speakers?
Here is a pdf with a little more data. I have not found more. Please excuse me, I have no deeper experience with this.
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Il is a general example.
I have no practical experience with this filterâŚbut search in post above, an other user did it and posted some curve. It always better to check result with measures.
I donât have the equipment for that.
I will test with the 15 band Eq by ear.
See that
Edit. Enable Loudness with a volume threshold high (80?). It will increase low frequencies
As soon as I activate FusionDsp, I have no sound and my music library from the connected USB stick is empty. When I deactivate FusionDsp and start volumio again, the music library is available again and I have sound again.
http://logs.volumio.org/volumio/y4HtsoC.html
You have peppy Alsa enabled⌠Not tested or supported⌠Disable it, reboot and let me know how FusionDsp works 
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Ah ok. I disabled peppymeter, restarted and now the sound works with FusionDsp.
I just want to say âThank Youâ to @balbuze for this tool! I have been playing around with it on my setup, and using FusionDSP with a newly acquired SMSL THX headphone amplifier to drive my headphones (DAC is SMSL SU9, RasPi feeds this via USB). One of these is a pair of Dan Clark Aeon X Closed and I was having trouble getting these to sound as good as I know they can. I installed FusionDSP and input the Oratory EQ settings for those headphones.
Wow! what a difference! This is a fantastic tool and makes the RasPi and Volumio truly a powerful streaming solution. Itâs been very stable as well - thanks again for the work on this!
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Thanks a lot! Very pleasant to read such a things 
Enjoy your music!
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Hi @balbuze, I canât seem to install the plugin due to not being able to install on Volumio version 3.233.0?
Can you help me out please? Thanks!
You need to update volumio to version> 3.236. The beta in V3.249 is available⌠But itâs beta, so consider that
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Thanks for the quick response! Iâll check it out
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Update on the release of the version which includes all the elements for FusionDSP: we found a small bug that introduces audio glitches on some DACs.
So we canât release it yet (thanks to our QA for spotting this bug), but we are working very fast on a fix and hope to release in the next few days.
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Greetings to you all.
I tried to make the Loudness curve from FusionDSP a bit more accurate
v1.06 so that it comes as close as possible to the ISO 226: 2003 standard. It wasnât easy for me, but it only took a few evenings ⌠I donât have a program or I donât know if it exists. In this experiment, I had to make do with my own Excel spreadsheet.
The result of the experiment looks like this:
// ------ volume loudness section â
let loudness = self.config.get ('loudness')
if (loudness) {
self.logger.info ('Loudness is ON' + loudness)
var composedeq = '';
var pipelineL = '';
var pipelineR = '';
composedeq + = 'highshelf: \ n'
composedeq + = 'type: Biquad \ n'
composedeq + = 'parameters: \ n'
composedeq + = 'type: Highshelf \ n'
composedeq + = 'freq: 10620 \ n'
composedeq + = 'q: 1.38 \ n'
composedeq + = 'gain:' + (loudnessGain * 0.2811168954093706) .toFixed (2) + '\ n'
composedeq + = '\ n'
composedeq + = 'lowshelf: \ n';
composedeq + = 'type: Biquad' + '\ n';
composedeq + = 'parameters:' + '\ n';
composedeq + = 'type: LowshelfFO \ n';
composedeq + = 'freq: 120 \ n';
composedeq + = 'gain:' + loudnessGain + '\ n';
composedeq + = '' + '\ n';
composedeq + = 'peakloudness: \ n';
composedeq + = 'type: Biquad' + '\ n';
composedeq + = 'parameters:' + '\ n';
composedeq + = 'type: Peaking \ n';
composedeq + = 'freq: 2000 \ n';
composedeq + = 'q: 0.6 \ n';
composedeq + = 'gain:' + (loudnessGain * -0.061050638902035) .toFixed (2) + '\ n';
composedeq + = '' + '\ n';
composedeq + = 'peakloudness2: \ n';
composedeq + = 'type: Biquad' + '\ n';
composedeq + = 'parameters:' + '\ n';
composedeq + = 'type: Peaking \ n';
composedeq + = 'freq: 4000 \ n';
composedeq + = 'q: 1.38 \ n';
composedeq + = 'gain:' + (loudnessGain * -0.0274491244675816) .toFixed (2) + '\ n';
composedeq + = ââ + â\ nâ;
composedeq + = âpeakloudness3: \ nâ;
composedeq + = âtype: Biquadâ + â\ nâ;
composedeq + = âparameters:â + â\ nâ;
composedeq + = âtype: Peaking \ nâ;
composedeq + = âfreq: 8000 \ nâ;
composedeq + = âq: 2.13 \ nâ;
composedeq + = âgain:â + (loudnessGain * 0.0709891150023663) .toFixed (2) + â\ nâ;
composedeq + = ââ + â\ nâ;
result + = composedeq
// ----- loudness pipeline
I will send a comparison with the ISO standard.
Peter
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Fantastic!
Iâm going to test it.
If ok, should be in v1.0.7
Thanks!
edit : I need to manage clipping at low level
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I donât understand, can you describe what you mean?
When a signal is at max 0dB and you add 22dB, clipping occurs. The way is to reduce the signal to avoid it. But I know how to do âŚ
I guess I understand. Iâm currently using SW volume, so thatâs probably not the case.
My current DAC canât do âHarware Mixer on Volumioâ.
I did not find any DAC that would allow MQA and Harware Mixer on Volumio at the same time. Likewise, no DSP intervention in the MQA signal will be possible.
Do you have any information about that? Iâd rather forget about MQA than DSP.
Thank you, Petr
To be more precise, FusionDsp already handle attenuation to avoid clipping pretty well ;-). In some case, with high gain convolution filter (12dB or more) plus Loudness it may clip. You can see it in CamillaDsp gui.
It is possible to add attenuation for left and right channel⌠So I think I wonât change anythingâŚ
About MQA, I donât use it⌠But as I understood, any intervention on the signal âdestroyâ MQA information.
I wonât debate about it, but you have so much real improvement with a DSP compare to obscurs commercial practisesâŚ