You know that this would avoid audio passthrough if there might be one? While using audio passthrough, Kodi won't touch the audio stream at all. If you want Kodi to touch the audio stream and modify that, passthrough won't be possible anymore.
It would be better if you let your AVR do the equalization (if possible). There is the Audio-DSP Add-on for Kodi, but that's not ready yet and I can't tell when this will be.
