I am interested in the Jamo E805 bookshelves, but they are 4 ohm speakers. Would it be ok to use my Marantz sr8400 or my Onkyo HT-R510 receivers to drive the speakers? The receivers won't blow up will they? I know 6 ohms is ok, but I never had speakers rated at 4 ohms. The rest of my speakers are 8 ohms that will be connected to either receivers. LMK. Thanks!!!