goldenera, see my long post above, but in brief...
1. are the differences real? - use a double-blind test to see (I've done this with turntables and there are differences for sure)
2. were the differences caused by re-connection or by the cable itself? - again, do a test - the connection might have had some corrosion on it
3. are the differences really improvements?
4. if yes, to all above, then are the improvements cost-effective relative to things that are known to matter greatly (such as speaker freq. response; room treatments; phase delay, etc.)
in sum, I have tested these things for decades and cables are about the last thing to do (usually); interconnects would come after speaker cables
FWIW, I have Kimber on my speakers - and I got them at a very large discount - I consider having them bi-amped to be more important