Finding 'The weakest link" in my stereo

So I ahve been pretty happy with my system. Decided to try aa new cable: Cardas Parsec. I wanted to replace the main sevenmeter run from preamp to amp, but decided to try a one meter Parsec first, just to see if it would be an upgrade or just a lateral move.

So i get the wire and stick in in my setup choosingthe link between my VAC Standard (I use it for a glorified tube buffer) and my pream Bryston BP-26.
The wire I had in there was some KCAG I had cut and with Kimber Ultraplate RCA.
So i am pleasantly impressed with the Parsec.
And didnot even realize the former cable was a "Weak Link".
Interesting.
(The immediate expereince was listeningto some hadyn string quartets (Naxos) from a box set, when the cable arrived via FedEx. So I put the new calbe in and immediately started listening.The big difference was the sound was not 'steely' as before. I thught it was just the recording was that way. Not so. Here it is the third day, and while listening to other items between, right now I am back to the Hadyn quartets box. and the sound is far more enjoyable. So good luck was found in buying the Parsec, and happening to choose the particular connection to change.

So what are you eperiences with finding the weak link in your cabling?

(i realize this whole post is not a question, but it is high time was started using these forums for more than newbie questions and perplexing problems. And I invite others to post things they find interesting.. So we can discuss the issues.)