I can't point to any specifics, but I have heard of numerous tests being done by audio professionals, using ears, and test equipment that show that the "oxygen free" speaker cables are in fact snake oil..
The results showed that there was no measurable difference between the "oxygen free" cables, and COTS cable of the same gauge.
I think "oxygen free" refers to the braincells of any person who actually believes the snake oil salesman.
Personally, I'm happy with any appropriately sized cable from Belden, West-Penn, etc..
For portable cabling, SJ/SJO types work just fine. If you're wiring your bookshelf speakers, a roll of zipcord works just fine.
