I find it interesting that while we give and take on the particulars of cables or their designs, the real system changers are the components themselves.
By "components"--I hope you're including that to mean loudspeakers, right?
My experience has been (on the variables affecting sound quality):
1. Loudspeakers (and loudspeaker placement)
2. Components (Amp, pre-amp, source) (in that order)
3. Quality of sound engineering on recordings
4. (and a distant 4th at that) Magic and mystery products (insert cables here)
Although not necessarily "components," don't forget room acoustics, i.e., bass traps, acoustic insulation, diffusers. 
While I agree with this list, I wouldn't rank it this way.
The source material (recordings), in my book, comes first. A bad recording sounds more like a bad recording on a great system.
DAC, Pre, Amp in that order, to me, next.
Speakers next. Perfect speakers will show any shortcomings in the devices above.
Next are tweaks that have been proved scientifically. Great valves; great crossovers; great treatments; speaker placement. The list goes on.
Lastly, as you stated, un-scientific, or otherwise magic,
anything.
Oh yeah; so not to be completely OT, BJC ROCKS! Great products, fine craftsmanship, and great service.

Pretty hard trio to beat!
Have fun,
Jerry