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The main differences between the two receivers mainly lie in their features. The 970 provides an extra HDMI to connect a projector with a monitor or two monitors, while the 1800 offers Pre-output connectivity. With Pre-Outputs, you can potentially upgrade by adding a Two-Channel amplifier for the front speakers or to Zone two allowing Zone two plus 7.1 function. Additionally, the 1800 has a more advanced power supply and can handle speaker impedance swings better.
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