Also, do *NOT* plug and unplug the HDMI cables while any equipment is powered on. Doing so can cause permanent damage to the electronics, requiring them to be sent out for repair. Unplug all equipment from the wall socket (or turn off the power strip if you use one) before changing the HDMI cables connecting them together. Putting them in standby is not good enough. HDMI circuitry is much more fragile than simple analog audio connections.
Marantz SR7009 avr + MM9000 amp --> Atmos 7.1.4
Fronts=NHT 2.9+AC2, FH+TM=DefTech PM1000, LCR+TM amped