Lpgal:
If your argument in court is going to be that your speakers now have lower resale value, and the dealer is responsible, so he should compensate you as a result, then don't bother.
Also, with your speakers retailing for about $9K, even if you were to win (on what grounds?) you would lose after attorneys fee's. Don't be surprised if your DAL dealer found out about the news at the same time as you. Also, warranty wise, you don't have much to worry about, not much can wrong, and DAL items can be bought through many sources. Give it a 3-6 months and someone else will probably buy DAL and revive it.