I'm selling of my 4 month old MartinLogan Source speakers and looking for a replacement in the HT setup. I will use them for HT stuff but 2 channel listening as well. I have the SDA1C's on a Carver TFM-35 in my shop and love them. Being 44 and having some high end hearing loss I like a speaker that is a bit forward and that can be played loud, mostly Americana and rock stuff. The LSI15's and the RTIa9's are both in my price range so I was hoping to get some feeedback. I know the LSI's are 4ohms and I'd be bi-amping off of a Yamaha RX-A820, I know the front channels will be ok at 4 ohms but an a bit concerned about assigning the rear channels to them and whether they will be ok at 4 ohms. THe RTIa9's are 8ohms so no problem there...and I am running a polk sub as well. Thanks in advance for the feedback!