Cables for rear surrounds

+1 to almarg & murphyb74.  Here's another chart:  http://www.roger-russell.com/wire/wire.htm#wiretable.  I went to 10 AWG KnuKonceptz cable all around with soldered Audioquest spade terminations and picked up audibly better definition and frequency response.  All of my speakers are 8 ohm nominal impedance and my rear surrounds are 40 and 45 foot runs, respectively.

There are some older threads that address the topic of different speaker cable lengths.  You can decide for yourself after you read through them.  good luck & happy listening!

I see some recommendations for BFA terminations, but I have found them very brittle and prone to breakage. I much prefer spades.
B

gdnrbob,

I've had the opposite experience. I've never experienced an issue with BFA connectors. I've used 5-6 different ones, all the low mass type without fancy screw-on collars,etc. I've never had one bend or break and I've never had one fall out or even become loose. I can't say the same about spades. I've had them come loose on several occasions. 

I can't speak for all of the various manufacturers of BFA type banana connectors. But the ones I've used, starting with Nordost Z-Plugs, have been rock solid.

The only time I would choose spades over BFA bananas is if I had to place the speaker directly against the wall. BFAs require a couple of inches of clearance for most speakers.

Agree completely with reubent's comment about BFA connectors. I've put together quite a few speaker cable pairs for myself and others and the various brands of BFA connectors I've used have been the easiest to work with, the easiest to use and the most reliable. 

DH Labs has a "Z Plug" Banana that is affordably priced compared to Nordost and others.  I have the silver version, and they are very easy to use DIY.  Their Odyssey 14 awg cable would also be good choice for long-run rear channels.  I think it is made in USA as well.