Do I need 10 gauge power cord if I have 10 gauge from panel?

I think I have a pretty nice system. Yesterday our internet was out and left with nothing else to do I sat down to listen to my system with my vinyl rigs (what do you streaming-only folks do if your internet goes down?). The first side or two sounded good but then after about an hour I found myself feeling uncomfortable. Something about the sound was annoying me but I could not for the life of me figure out what. I tried listening to different records including some that are known to be good. No change. I turned it off. 

My point, if there is one, is that everything matters. Sometimes you can't figure out what the problem is. It might be you (me). 

8th-note

Watt meter is nice but it doesn't in my view accomplish everything you want.

Not sure it measures the extremely high speed changes in Power fluctuations needed for Music.  
Isn't the benefit of larger gauge wires throughout the electrical food chain to avoid any unnecessary impedance when power demands occur?? As tiny and subtle as they may be for all those gentle nuances in sonic transmissions.

@fsonicsmith1 Bad AC perhaps?  The one thing that nothing but an AC Regenerator or top notch power conditioner can help with. This is especially important to consider if you live in a high density population area or are near a commercial zone “dirty” AC  can be a very real problem. 

@jasonbourne52 … “It is unlikely a 14 gauge power cord is not negatively impacting the sound." That is poor grammar!”

You are correct. I have no idea what I was thinking: It is very likely a 14 gauge power cord is negatively impacting your sound quality. 

No.  Listen to JasonB