Need recommendations on 15ft speaker cables

I agree with Terry9....components are a top priority especially speakers. I bought the Canare OF wire by the foot from Performanceaudio at a great price since I'm always looking for a great deal. I then assembled them myself with Nakamichi banana jacks. Ebay has a vendor from Minneapolis that has Canare wire already assembled  at various lengths and colors if you don't want to dink around with assembly.

Just get any 12AWG cable, or even 14 or 16 for that length. You will NOT hear any difference between any OF Copper wire. Heck, you could use a coat hanger. So don't waste your money unless you're wanting something that 'looks nice', because performance won't change at all. 

The OP is already using 10 awg stranded copper speaker cables, which is plenty big for the run length.  Other than a few posters suggesting Canare 4S11, just about every poster has given a different cable recommendation.  BTW, 4S11 is actually a smaller stranded copper speaker cable than what the OP is using now, at 11 awg when configured in star-quad geometry.  

At this point, he/she either jumps on the buy/try cable merry go-round or tries the Cable Company or others that will lend cables in order to evaluate which of many cable offerings he/she likes best, or if they even hear a reliable difference between cables.  A lot of us have done the buy/try route, but it is expensive and time-consuming.

@crustycoot 

My advice is...  Mogami, and Canare is another, both available from World's Best Cables on Amazon, see: Canare 4S11 or Mogami 3082 Once you are accustomed to these, you can try borrowing some Cardas, Audioquest, Nordost, Transparent or other higher priced cables.

Good advice: Mogami/WorldBestCables/Canare/Belden (actual cable manufacturers) or other Speaker cables on Amazon. Read the descriptions/diagrams and reviews carefully. And you can return easily!

Bad advice: Higher priced cables from resellers so called major brands (they buy or import cables and dress them with thick jackets and you pay 10x 20x more

Very very happy with a recommendation I got here, fantastic value: https://www.thecableco.com/straight_wire.html