Has biwire speaker cabling become "old" ?

yes...seperate cables for each run...not ganged together. 

Disclaimer: I’m a dealer for some of the products mentioned.
I am actually now using a crazy looking short quad wire system after previously running from jumpers/cables off a single wire and feel there is a sonic benefit. 3 of the 4 are bare wire however (insulated with clear pvc tubing) since I wanted to test the setup before springing for 4 sets of cables and was so satisfied I havent gone to expensive cables yet)
Both my amps and speakers have dual terminals so I decided to make use of them. (amps are PS audio BKH 300 monos and speakers are TAD CR1)
I’m actually running 2 sets of cables off each of the amps terminals. One terminal powers the velodyne subs high level input with another run for the enigmacoustics super tweeter and the other terminal powers the TAD’s mid/high terminal and additional run for the TAD’s woofer terminal. All the (16 Guage?) bare wire is doubled up.
I should post a pic of this Frankenstein set up for laughs. At some point I will experiment with 4 sets of short expensive cables to see if they can Improve upon the fine strand bare prototype wire I’m using that I was given to test for manufacturer.

I just read the Vandersteen website "faq" on biwiring. Very informative. 
Thanks for your guidance! 
N

Yes, Richard has done a great job with that site.  I don't know any others who have such a comprehensive Q&A page like that and Richard himself answers the questions.

Email, I can't wait to hear the you use in your system.  As you know the only thing is using the same length and type for each and every run.  

Thanks to whoever pointed out the faq on Vanderstein's  site.   A great read.