Question #1 Synergy is important but in my opinion but not necessarily to be dedicated to any 1 manufacturer (2 or 3 maybe after all you have to listen and pay for it). Once I tried all cables from the same manufacturer (Nordost) and wasn't impressed enough to spend the bucks. I will admit I didn't make a real serious comparison only because I didn't have the time and wasn't willing to replace everything all at once. Personally I am willing to compare again but this time I would have to try many different combinations to see where I would benefit the most. I did get the Nordost Frey speaker cable for my system. A minor but good tweak for me.
Question #2 1 brand of a cable may sound horrible in a certain system but fantastic on another.
Question #3 from Tpreaves Great advice - But I will add that cables should be the final tweak to your system. Generally those cable 'tweaks' are minor compared to most components in my experience. To me if there is any little difference I would like to change in your system that is when I look to cables in my opinion.
Question #2 1 brand of a cable may sound horrible in a certain system but fantastic on another.
Question #3 from Tpreaves Great advice - But I will add that cables should be the final tweak to your system. Generally those cable 'tweaks' are minor compared to most components in my experience. To me if there is any little difference I would like to change in your system that is when I look to cables in my opinion.