I ran an 8 gauge cable direct from a 20amp breaker to a L5/20 and yes, it's a solid improvement.
Dedicated 20 amp line
Just before all this craziness began, I had a dedicated 20 amp electric line installed along with hospital grade wall outlets. I am amazed at the improvement it makes..tighter, cleaner better defined sound. The cost was $1200 and that was for an all day installation without shopping around and in an expensive area. Really a bargain considering the difference it makes. My KEF Reference 5 speakers have never sounded so good. I’m not sure if everyone will experience the same amount of improvement but I highly recommend trying. Nice to have this for the long days to come.