Hello, i have just purchased a Nad 3130 amplifier and would really appreciate help with understanding how to match compatible speakers with the amplifier. On the back it says 200watt power rating, and has 2 options for impedance 4ohm and 8ohm. After browsing the internet it says the amp has a continuous power output of 30watt at 8ohms. I cannot seem to grasp how this all works. If anyone has any speaker recommendations for this amplifier would be very much appreciated. Thanks