What do $2500 speaker cables sound like?

Just buy them  why spin the tires.  Make sure you get matching interconnects for the full blowen result .   Also don't worry about that speaker you use  

They sound like $500 speaker cables. And they sound like $15,000 speaker cables, and sometimes they sound like $20 worth of zip cord from Home Depot. Above a few hundred dollars for say a 3 meter pair (longer runs are going to cost more) and it's just whatever differences you hear. Either way, no way to know without living with them for a good long while in your system.

Its not the speakers , But the amp and cables you are running

MIT fan here having done really well on “new old stock” that can be found and not break the bank.  Have been really happy with the results, esp. afire “learning” about proper cable management which is crucial. (Shout out to MC for that one!)

Well one specific thing I’ve read hear is 100 percent wrong,you don’t need to “live with them for a good long while” to hear a difference in speaker wire. After switching them out,you will hear a difference in 30 seconds of listening,period. After 5 minutes you will know if you like the difference! All the time spent after that will just confirm what you heard initially in the first few seconds. Sure,spending some time with the new cables is advisable,but you’ll know quite fast if it’ll work for you in your system. If you can’t hear a difference,or the difference isn’t to your liking,move on,hopefully you were able to borrow or rent or beg off a set from a friend. Don’t buy a set because they look good or your buddy has them,or they sounded wonderful in the store on their gear. And don’t expect to hear big improvements from cheap cables,it just doesn’t happen,or atleast very rarely. So if your poor or cheap,be happy with what you have, and go buy your kids dinner or diapers or whatever. Good luck,John