I don't why it was so, but I prefer the 10 guage solid core Romex to the ten guage stranded Carol(water proof) wires that I had been using.
I had a couple of dedicated lines using the carol, an elctrician/audio friend suggested to use the solid core wire so I did just one line this way so I could compare.
Regardless of what gear was on what cable(Iswitched back and forth, source on solid, amps on strand and then switched to source on stranded etc)the solid core had the edge in not being edgy at all but in speed and clarity.
The stranded was dull and slow in comparison.