I have friends who are engineering snobs and they are all amazed at how good my stereo sounds compared to theirs.
Your stereo sounds good because snob engineers built amazing amplifiers through lots of research and actual engineering work. Same for your speakers. Your cables, power cords, interconnects do absolutely nothing to improve the sound.
The only reason you are listening to your music tonight on your very nice and awesome stereo is because engineers and scientists, using reason and science, built them. And none of them would be caught dead with a speaker cable, power cord or fuse (I can't believe people fall for this one) costing more than a few bucks. If they tell you otherwise they either work or are being paid by an audiophile cable company.