How do I know how many ohms a receiver have? I have a Denon AVR5600. How many ohm is my receiver? Also, I heard this receiver is not good for music. What receiver is? I need a receiver for a pair of Magnepan SMGa (just bought it) for karaoke (stereo) and I heard that this set of speakers need a 4 ohm amp/receiver. Any help will be great TIA.