Cables from amp to preamp or longer speaker cables…

So today I was in the room that I’m setting up for dedicated listening. Speakers will be at the front of the room and sofa will be at the other end. I dug out a pair of expensive speaker cables I had from many years ago and discovered they are only about six feet long. This would be ok if I had my rig set up behind the speakers but I want to sit on that sofa at the far end of the room (12 feet away) and have my Benchmark DAC 3 HGC beside me so I can plug headphones in occasionally……do I buy long speaker cables (probably expensive), or would I place my amp behind the speakers and run long cable from that to the preamp beside the sofa and if so would this long cable create any issues?