As you start making your changes, take your time. I won an auction a few weeks ago for three sets of Z Squared solid gold interconnects. I plugged them in where I had previously had some Radshak standards. I heard no differance. huh? Then, about a week later I started noticing that everything started sounding better. Much better. That crazy, scientifically impossible 'burn-in' time really is for real. another thing: when you are ready to really see if your new cables can compare with the old, try using one set on your right channel and the other on your left. Put on your most favorite CD, the one you know like you know better than anything else. Play with the volumn controls and the balance controls. Makes for good comparison. Especially if you have someone 'trade-out' the cables and then you get to guess which witch is which....
Careful. this test can cause financial disaster for those who can't tell the differance....what, will new speakers help....pre.....amp....power cord....house redecoration...divorce......