I have been waiting to upgrade my speaker wires from 18 gauge to something more substantial like 12-14 gauge and did an experiment in the process. I have Klipsch Reference 52 towers for my front L/R and matching Klipsch speakers for my 5.1 system. I bi-wired the front left speaker to see what changes I might notice.
Well, I noticed nothing at all. I listened for a while and left the front R wired normally and compared the two. Again, my perception was not change at all. Then I continued with wire upgrade wiht 14/2 gauge from Home Depot.
The difference is significant! The highs seem a bit clearing though they were always a bit "bright". Much more noticeable is the mid-range making the overall sound much more full. My wife agrees there is an improvement and that says a lot!!!
I took very good care, like I always do, to make good connections during the hookup process so I am sure that was not the reason for the improvement.
Just thought I would let others know of this experiment and result. Upgrade speaker wire gauge (assuming it at least marginally needs to be upgraded) and the results can be significant and bi-wiring was a waste of time (for me at least). I will upgrade the wire on the center tomorrow and the surrounds sometime soon.
Oh, and by the way, it was Monster wire I had before. I went to Best Buy and they had 12 gauge Monster wire that was $50.00 for 30 feet or $1.66/foot. The Home Deport 14 gauge wire was $0.60/foot.