found the impedance graph for those speakers and looks like it goes from 3.2 to 16. will this sweat the sr7009?
As with any 4-ohm nominal speakers, it will depend on the volume level and size of your room. In a medium sized room and if only moderate volume levels are used, the SR7009 shouldn't have any problems at all powering these speakers. However, if you prefer louder volume levels for movie/music listening, the SR7009 "may" shut down in protection mode. I would suggest not worrying about an external amp until after you've had a chance to use the SR7009 amps on their own to see whether or not an external amp is required.