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Oh awesome
I’m going to research and think through this a little more and eventually likely hit you up about this...
Keep us posted Andreas, as I'll want to use the same pathway as you for my project:
PC with a OS --> Spotify/Tidal/VLC/Kodi/Firefox --> A system-wide EQ (Room EQ) --> Digital XO (FIR) --> Multichannel Dac --> separate amps.
For Linux, my guess is there is no limit when customising Pulse Audio to your likings.
A readymade software for crossovers and EQ example:
https://t-5.eu/hp/Software/Pulseaudio Crossover Rack/
I notice it too. Must be very recently. Looked at it couple of days ago.
Thanks! I still haven’t found a software crossover for Mac, but this is a good start.
In short, it's EQ that is only activated when the input drops below (or above) a certain threshold level. In this case, it would be used to boost low frequencies when the volume dropped below a certain threshold, to compensate for the hearing system's nonlinearity (equal loudness curves).
How many volume levels/fitler sets do you think a system should have to effectively implement dynaimc EQ (loudness + LF reduction on high volumes)?
Ideally, it isn't discrete at all.
For example, this is a dynamic EQ VST plugin set up to kick in only when the signal drops below -20dBfs (the "threshold"). The magnitude of the bass boost is then inversely proportional to the level of the input, so that at -20dBfs the boost is 0dB, and at -X dBfs the boost is +18dB (this is just an example btw, it's not supposed to be correct necessarily):
View attachment 28416
Heh, I know it would be best if it isn't discrete, but with BruteFIR it can only be implemented by changing the filters based on volume change. I am basically asking for your opinion what do you think would be a "reasonable" number of filters to implement in that scenario? It is also a question how many filters would folks be willing to generate in order to achieve such functionality..
Fair enough In that case, I'm not sure, will have to think it through. Perhaps others have thought about it already? Maybe 4 would be "enough"?
I was thinking about 5.
So, is yellow line on your graph for quiet playing and blue line for very loud?