Cable lengths

This is a 2 part question. First I’m wondering if cable lengths make a difference in sound for better or worse. My thinking is that shorter is better and longer would be worse. I’m using all Straightwire  Crescendo speaker cable and IC xlr. For my IC xlr are a 1 m pair. But am wanting to put my CD player by my listening chair which is about 15 ft from my ARC Ref 6. Which I will need about a 5 meter pair. And about $4000 new. I really love the bass with the Crescendos especially with my Krell Fpb 600. But are very hard to find on the used market for them that long. The longest I’ve seen was 4 m. Also $4000 is steep for me to spend right now on ICs. Could anyone recommend a very good xlr IC 5 meter on the used market for about $1500 that has very good bass like the Crescendo?