Dolby Home Theater VS PulseEffects

Lenovo laptops (used to at least) have a few DSP filters in effect. Try disabling any Dolby setting you can find. I know they used to use this https://professional.dolby.com/tv/dolby-home-theater-v4/ during the Win7 era, and it had lots of settings. Source: over 1 year ago

Linux: EasyEffects (free and open-source). Source: 5 months ago

For DSP, we already can do that using something like Easy Effects[1][2]. The biggest issue is acquiring proper impulse-response data. In theory, it has to be tuned per-model, so turning basically require pro-grade equipment and a recording studio. However, apparently many people assume Dolby is using the same profile for all laptops, so just copy-paste the same file here and there. Not really sure which is the... - Source: Hacker News / 6 months ago

- Easy Effects: Effects for PipeWire applications; configure your speakers & microphones (e.g. Noise reduction filter). Source: 8 months ago

EasyEffects could be a replacement for EqualizerAPO. You can do some gain staging there if you want, as well as a bunch of other stuff. Source: 11 months ago

However if you want a one size fits all audio processor like the proprietary systems there are those as well - check out EasyEffects for Pipewire - https://github.com/wwmm/easyeffects It's almost guaranteed to be in your distros repository as well. Source: 12 months ago