I actually have a LS-100B now. I think they sound very good. Compared to the RTi4 I briefly owned, they are a little harder to drive with my amp. I prefer my RTi4, greater soundstage and better bass. Both units are very musical and for their price I am very happy. I have to return RTi4 because of some unacceptable cosmetic defects for a brand new retail unit. They are sold out so the seller did not have any to replace. I like the sound of my LS-100B, that is why I am looking for AS-B1/2 with higher efficiency.