Should I upgrade the cable of my Line Conditioner?

I do not have much knowledge with electricity.

But I would use a power cord that gives a lot of rooms , for high power peak demand.

Such as for subwoofer , powerfull amplifiers , etc.

I use PS Audio Perfectwave AC 12 power cord. 8 gauge.

You may find more refined power cord , but I am sure that with a 8 gauge,

it will be enough.

My power conditionner has 8 outlets , fully used  with power amps ,subwoofers ,  for my Home Theater system.

No. Furman supplies a suitable cable. Replacing it will be a waste of money.

I was told that the manufacturer only supplies a power cord that is good enough to get you started until you can save enough money to buy a better power cord. Does this not hold true for the original cord that goes in the power conditioner? Wouldn’t that be the original sin? Why don’t we need to replace the wiring inside the wall?

Just replaced the wiring in my wall.  10ga to the service panel.  Recommend 10 ga power cords for amps.

Most likely would make an improvement as others have mentioned. Many times it depends upon your selection of power cords. How much ($) are you willing to spend, then perhaps you can get some suggestions.