I used a 10' one when running my CA-11's open.
I have a 10' Hydra M-F 1/8" ext. cable that I've never used. Once I got it, I had gotten a set of full bodied mics and only run the CA-11's in a low profile situation now. I could sell you the ext. cable for $25 incl. ship/Paypal. I could post pics tomorrow if needed.