I am now a proud owner of the RTI28's. I am using them as the front pair in a HT setup on stands. I have a Harman Kardon AVR525 receiver(awesome by the way). I purchased the RTI28's as an intermediate while I build my home system. Eventually I would like to get the LSI25's for the front and move the RTI28's to the rear, but I noticed that the LSI25's are 4 ohm. Would I need to purchase a seperate amplifier for these speakers and I so where can I find a good one?