Mike,
I am not too familiar with the symbilink since i have not installed one before. However, it must be some type of connection with a higher voltage out (line driver) plus the advantage of having the merits of a balanced connection. This is very similar to those Denon units and the recent ones Rockford commissioned Denon to make the rfx8250's . Obviously a design intended to make best of the transmission of delicate low level distance accross a longer lenght, in car audio situations.
Experimentation is still key here> Funny , that installers used to learn a lot from "very adventurous car audio enthusiasts" Who are willing to gamble.
I would like to share another experience though.
IT is called spreading the cost relative to using cables.
If there were no budgetary constraints, I would suggest a throughout interconnect change from, head unit down to the amps, and anything in between; line drivers, crossovers and active eq's. Sometimes , when home audio cables are used, its cost can easily match every other equipment that was installed and the owner would surely not understand and protest. SO this is the option. The most critical part is the last line that goes to the amps. Say if you had a crossover(active), this is where the BEST cable you can get hold on gets into. Then the rest of the budget goes upstream.
From logic, conventional thinking would say, IT defeats the purpose as the upstream cabling is compromised. NO, it is not. Again, I have tried it, and it should work in your case.
Conventional thinking will say: car audio cables are built for the purpose and should be better at screening than home audio cables,NO not again. Cables like Sonic Link Vermillion, transparent link 100, qed qnex2, sonic link pink are better sounding than the best in the catalogue of Phoenix Gold, Esoteric audio or the RFosgte's . ( the acceptable ones (car audio are only stinger).
