Which wire has biggest impact?/


Trying to upgrade my cables- If I wanted to try a new cable which one would have the most impact-I know they are all important but which one would you start with- speaker cable- interconnects etc- thks
bopper
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i agree with @millercarbon.your system is as good as the weakest link in the system.find the weakest link or component and upgrade it suitably.
My take:
Speaker cables, Power cords, interconnects, ethernet cable, power conditioner in that order. 
The general recommendation is to spend 10% the cost of the entire system on cables. This would include the speaker cable, interconnect, power cord, USB, digital and other types of cable.

Personally I have spent about 25% the cost of my entire system on cables. In my experience, speaker cables and interconnects are equally important. Power cords, not so much. I will be upgrading the USB cable very soon and will see if the difference is worthwhile for the price paid.