Hi, During my search for the best possible sat+sub system in my budget I have listened to some M&K speakers from the K series. I wanted to use them with a receiver like Denon's 2105/Marantz 5500 or something alike. However, I've noticed that some of the K series speakers are 4 ohms of impedance while others are 8 ohms. I wanted to know: 1) Is there any problem connecting two different impedance speakers in the same system? 2) Can there be any damage to the speakers or to the receiver because of connecting 4 ohms speakers to these receivers? Can the receivers handle such speakers (In their specs all of the data is written about 8 ohms impedance)? 3) What impedance should be used with a more powerful receiver/amplifier- the 8 ohms or the 4 ohms? Will these receivers be powerful enough for "pushing" 4 ohms speakers? will they be powerful enough for 8 ohms speakers? 4) I have seen that most of the speakers systems (MS Genie, MA Radius, Castle CC3, Tannoy Arena) are all 8 ohms of impedance and heard that for using 4 ohms speakers I need a much more powerful receiver but this is something I don't understand. It seems to me that the opposite is true and using 4 ohms speakers can cause them damage. What is correct? Why are the M&K K7 and K4 4 ohms of impedance? Does this give them any advantge? Please help. Thanks guys, Ariel.