After reading through the manuals of the Yamaha N470d receiver I recognized that the usage of banana plugs are documented for the speakers but they are not for the receiver unit of the stereo device: The speaker input plug allows by default screwing the speaker cable into the plug. You will find a plastic protection.
To resolve that problem I googled the issue. I found several forum posts in which the users are describing that these plastic protections can be removed easily. And so they where: I took a flat small screwdriver and pulled the plastic nobs out. If you are careful the plastic protection is even not damaged. After the removal the speaker input supports banana plugs.
Please be aware that this worked for the Yamaha N470d receiver. I cannot guarantee that this behavior is the same on all other Yamaha Receivers. See the pictures below for the removed status.