Hello, this is my first post after a few years of on and off lurking... I recently received a set of 6 hand-me-down Infinity speakers. They don't have any kind of spec sheets, but here are the model numbers: Front: RS 5000 Center: Video 1 Surround: Reference EL My question is two-fold. First, does anybody know what the impedance of these speakers is? My Pioneer receiver has settings for 8 ohm and 6 ohm or less speakers and I don't know which one I should choose. The second part of the question is, if I can't figure out what the impedance is, which setting on my receiver should I use? Am I going to do damage to either the amp or the speakers by choosing one or the other? Any help anybody could offer would be greatly appreciated. Thanks.