Iamtheone
There is a visible picture quality improvement and sound is cleaner and more rhythmic.
We're definitely going to be off-topic if we continue this discussion here so all I will say is this:
I have for the last four years invested heavily in the quality of my mains supplies to all my av components and interconnects and speaker cables to the point where i have a dedicated 230v supply in my cinema room and either Russ Andrews or Mark Grant power cords or interconnects to all components.
I can confidently state that the return on my investment has been well worth it.
It is possible to get a lot of performance out of very modest kit if you take this route.
A good comparison is taking a basic car and upgrading key components to squeeze extra performance. Its still a Fiesta but one with punch!
I have to disagree with doink because it is a fact that a well constructed lead that is built to reduce airborne RFI (as the leads I use are) will have a noticeable effect. Yes if you are able, you should get back as far down the 230/40v supply as you can but, any reduction in RFI is better than none and can make a real difference.
If one was to replace all of their stock power cords with RFI reducing cords and do nothing else, IMO one would definitely notice a difference.
Then again everyone has a different interpretation of what is "good sound."
You have to try yourself and see.
I believe both below people will give a refund if your not happy.
Mark Grant is a member of this forum and is IMHO an excellent source for high end cables.
Russ Andrews have their own site for info.
I have no financial links with either for the record.
Hope this helps and starts another convert on the road to true hi-fi enlightenment.
Regards
Mark