Andre, I had the exact same concern when I ordered my VP180 to be powered by a 6 ohm rated receiver (Onkyo).

The real issue you can face is taxing the receiver which will cause it to overheat. To put my mind at ease, I ordered an Aircom T9 https://www.amazon.ca/gp/product/B01LW1Q4X9/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

I can happily report that my AVR runs nice and cool with the Aircom and I've run it pretty hard and loud.

That said, the Denon should be fine without the Aircom but it's nice to have the peace of mind to run that beast of a VP180.