Sub cable length?

Should I match the length of my speaker cables to the length of my high-level sub cable?

I’ve got an LFD/Mistral amp with LFD Spiroflex Speaker Wire (3 meters) to B&W 805’s and using a REL S/3 SHO sub with the stock power and speaker cables. I was going to get a Snigal Cable http://signalcable.com/relspeakon.html and was unsure if it made any difference between the standard 6ft (which is plenty long enough for my needs) or get a 10ft to better match the 3-meter speaker cables.

Thanks!

And sorry if this was a dumb question, I didn't find this in any past threads.