How to Improve Your Linux PC Audio with PulseEffects
Is it possible to improve your Linux PC’s audio without having to buy an expensive dedicated sound card? Say hello to PulseEffects.
With PulseEffects, you can make the sound louder or apply auto-gain that “normalizes” frequencies automatically so that you can hear whispers in movies and explosions that don’t destroy your speakers. You can enhance your music’s bass levels or apply the equivalent of Creative’s “Crystalizer” effects, which can make your MP3s sound like a live concert…
Source: https://www.maketecheasier.com/improve-linux-pc-audio-with-pulseeffects/