what kind of discount on demo speakers?

You cant expect demo speakers for half off even w small ding. 40% discount is LUCKY.

If you truly will have the original full warranty, I also doubt you'd be able to get away with only 2000. Generally speaking, I think 30-35% off is more realistic, and a 40% discount would be a great deal. On the other hand, the discounting potential can vary considerably depending on the manufacturer. I know of one speaker line (the TAD inspired Pioneer EX) that is very heavily discounted (35% off) brand new with full warranty. And they sure aren't junk. I've heard them, and they are excellent. So if I was buying a Pioneer EX demo, I would expect 45-50% off in such a case.

It all depends on how desirable the speakers are (the more in demand and more difficult to find used/demo, the more you will pay); how much the margin the dealer has on the speakers as new (the higher the margin, the more the dealer can discount); and finally, how much/little of a margin is the dealer willing to work with.

Too little is known for me or anyone to really say now that I thought it over. 40% could be dead on or dead wrong.