Thanks for the info guys. I just ordered an adapter (about 6 inches long) from Chris_Himself. It's a female 6.5 mm to banana plugs. Initially was charging me $45 with shipping but later bumped it to $50 with shipping, still fine. He mentioned that his cables should make a difference in sound quality. I haven't really looked too much into using cables as a method for improving sound quality, so won't really know until I get it. Although seems doubtful, since then with that combo, I'll be using the Emotiva instead of O2, so won't know if the sound changes because of the new amp or cables or maybe both.
Waiting to get a reply back from Emotiva on my quote with USPS instead of Fedex. With Fedex, they offered $267 with everything included to near Toronto, Ontario as a reference.
Wait you're saying a female single ended connection to bananas? If that's the case, I would HIGHLY recommend you research this a bit more. I spoke on the phone with Drew from Moon Audio, because I wanted to order that same thing. He said that by doing so, you would be shorting out the ground (because you have to merge both grounds coming from each channel into a single ground in the female connector), which will mostly likely blow the amp and/or damage the headphones. He said that some amps actually will be ok with this, but the majority ("90%") so not support this, and will sustain damage. So just make sure you check up on that, unless I've misunderstood.