Mr. glupson
1. "How does going from a thick (0 AWG) cable to the connecting piece (8? 14)?"
Solutions were provided by some who implemented their DIY solution, so did I with a crimping device and some soldering. I used 8 AWG.
The ends of such a cable have some contribution to the total resistance, but it is negligible because they are very short. That ending has also a physical benefit of strain relief over the rest of the thick cable.
It was answered by me.
2. "That most of you are having the wrong cable connected in your system!", "It may be true".
As no one ever thought his cable needs to be calculated, the industry and the sales people made and sale cables of thin wire with thick urban myth crap, for reasons of par. 1 and costs, and as most that have an amplifier with better DF than 150 are in this category. As a fact, for all those, they use and hear only a fraction of their system potential! No matter what they've told about the 14 AWG cable of how hi end it is and what story it has to justify a hefty rip off.
3. My thread is no clutter. I stand behind my word and those who gave it a try approve it loud and clear. You are invited to give it a try too. You have more to gain than to lose.