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I'm using SoundSource to allow myself finer control about my audio, including EQs and different output devices for different apps.

I also discovered that I can add Apple's preinstalled AU plugins to the mixer:

AU effect selection in SoundSource

I would like to know if there is any AU plugin on the market that provides an individual EQ for each channel (left and right, stereo) that I can install and use in SoundSource, please?

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I found a multi-channel AU/VST plugin which SoundSource can use.
I've no idea how good or flexible it is, so give it a try. It claims to be multi-channel but I can't tell from the description whether these can be configured truly independently.
Voxengo Overtone GEQ
The 'problem' with EQing L/R separately - & why it's less likely to crop up in 'pro' audio editors - is that EQ changes phase*; so changing phase on each side of a stereo image can produce slightly odd results.

I answered a question on here once, a while back, on how to do something similar, but it was using Audio Hijack [SoundSource's older brother] & contains it own plugins which can split left & right [they're not installed as AUs, they're definitely internal to the app… I tried before;)
There's another answer underneath using Soundflower & AU Lab, but I stopped using those years ago & don't know if they still work on newer OSes.

*It doesn't always & can be partially avoided, but that's an entire university dissertation;)

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  • Thank you. Actually, the Voxengo Overtone GEQ was the way to go. If you edit your answer linking to it, I will mark it as accepted answer. Btw, yes, I remember those days using Soundflower & AU Lab as well. It was a mess compared to SoundSource, really amazed by this piece of software. I think Soundflower won't run on BigSur anyways.
    – Martin Braun
    Sep 4, 2021 at 23:59
  • Link changed. tbh, I haven't used Soundflower since it first started getting flaky at maybe Mavericks or so. I've had Audio Hijack on every Mac since, Loopback for some more advanced routing, but I now have SoundSource on all the 'consumer' Macs here, including my HTPC, on which I use a multi-band comp to stop the explosions bending the walls whilst still being able to hear speech:)
    – Tetsujin
    Sep 5, 2021 at 8:47

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