Denon avr-x3700H vs avr-x4700h

The 3700 can process 11ch 7.1.4 buy adding an external 2ch power amplifier.
Since the center ch is the most important in a home theater.

Thanks for your reply, would this mean I still would have 1 centre speaker and somehow the amp would connect to the ‘centre speaker port’ on the back of the 3700H? Just trying to figure out how this works as It’s the setup I’m looking to create.

The safest way would be using only one channel. If you can bridge mono i think just split the signal like a sub. Maybe another member will reply.