I am running out-of-the-box Ubuntu 20.04 on a Lenovo Thinkpad X1 Carbon (7th generation) laptop. In another post, I described how the audio aux output pops and taps on the right audio channel, which I do not know how to fix despite trying the posted solution. As an alternative, I can connected to my headphones using Bluetooth instead. I can get it to work and the pops and taps are gone, thank goodness. With the Bluetooth there is a different problem, which is that the bass isn't very strong and the audio volume isn't as high either compared to the audio jack output on the laptop. That is, it basically works, but it's kind-of lame, it's not what it should be. Comparing the experience to my Android smartphone, the audio jack and Bluetooth sound about the same through the phone, and the bass and volume are both good.
I can use the pulseaudio equalizer on the laptop to at least restore the bass. However, this is a pain because: (1) the equalizer has zillions of controls; (2) I only want the equalizer for Bluetooth audio, and not for audio through the audio jack; (3) it adds an extra layer of audio processing that seems to cause its own problems. Regardless of what the equalizer can do, I don't understand why the audio jack and Blueooth audio aren't the same experience.
