Mixing speaker cables on bi-wired speakers


This is going to sound like a dumb question.  I have bi-wired speakers and I like the bass from XLO and transparency of Nordost, so I have Nordost on the top posts and XLO on the bottom post for good solid bass.  Has anyone ever mixed speaker cables as I have described?  Is this common or not recommended?  It would seem to me that the Nordost ribbon cable is fast and XLO (XLO Ultra) is slower in comparison, but I cant tell that by listening?  

FWIW, the speakers are EggelstonWorks Rosa

Thoughts?   
mudbone
Jayctoy, thanks for starting the thread. I had a feeling it has been asked, but I couldn’t find it last night. Thanks and thanks for all the responses.
I found using the same brand boring at times...same brand will not guaranty matching...trying is the best way....
I mix speaker cables on my Montana EPX speakers, with no problem at all. 

Below is dependent upon which amp I'm using:

HiDiamond 8 on the lower terminal and Cerious Technology Graphene on the upper terminals.
OR
Duelund 16 gauge speaker cables on the upper terminal and Western Electric 10 gauge on the lower speaker terminal.
Using different gauge for upper and lower terminals might affect speaker's frequency response.  I understand that woofers take more current, but low/high ratio will change - tweeter cable will have larger (percentage wise) voltage drops.  Most likely you won't notice the difference with gauges 10 and 16, but many people make mistake (IMHO) of wiring tweeter with very thin wire, thinking it does not require a lot of current.  Sound won't necessarily be bad - just different.
Years ago Synergistic Research made a bi-ware speaker cable (with just one set of connectors at the amp end) that had a smaller wire on top and a heftier wire for the woofers.