Line conditioner...

pragmasi- Can someone explain what ’dirty power’ sounds like.

Yes but its better if you hear it for yourself. Its easy. Get your system all nice and warmed up some night and listen to your favorite music. Then pause, go out to your breaker box and flip off a bunch of breakers. As many as possible just be sure to leave the system on! 

Go back in and listen again. Pretty dramatic, eh? So now you know. And if you find a good power conditioner that is exactly the kind of improvement it will bring. BUT even with the best conditioner and a whole slew of excellent power cords and whatever else you can get your hands on it will STILL sound even better when you go out and do the same flip the breakers trick. 

If a conditioner doesn’t improve the sound its not a good conditioner. Because no one has good power. Even if they did no one has wires that keep the power good all the way to where its used. Which is a long way. All the way from the meter to the panel, through the walls and components and finally all the way to the voice coils. Every single inch of that benefits from conditioning. Or as mahgister calls it embedding. Whatever. Point is not what you call it. Point is understanding every single inch matters. Improve even one inch anywhere along that entire path and you will hear it.

At least, when you and your system get to where you can hear it you will. Because I guarantee you its happening, whether you and your system are good enough yet to hear it or not.  https://systems.audiogon.com/systems/8367