My Nordost dealer stated that Nordost would no longer sell internal biwire cable because they belived a single cable plus jumper sounded better, but that a single cable plus jumper was not as good as a double run of cable.
I remember at one time Transparent also recommended jumpers but later, offered internal biwiring. Manufacturers cannot make up their minds!
I tried every combination and always prefer 2 separate runs. 2x cost but well worth the investment.
