We had the opportunity to play with the new Delta X12 speakers today and were quite impressed both with the fidelity and feature package. This 12" 2 way speaker is self bi-amped and can operate on up to 10 hours on its' internal batteries. Of course you can also plug it into the wall. The Delta X12 features 2 UHF wireless receivers each with 100 selectable frequencies, a CD player with anti-shock, 3 channel mixer, EQ, line out and the ability to power a second passive speaker. Also a 6 year warranty. We will have them in our rental inventory shortly.