Hello DarthShadow,
the Sony SA-RS5 speakers are part of the Sony HT-S40R soundbar system and connect wirelessly to the main soundbar. They use an included wireless connection unit for the wireless connection. It is important to note that they do not have their own Bluetooth profile.
It is unlikely that these wireless surround speakers can be paired directly with a Denon receiver as they are specifically designed for use with the Sony soundbar.
Sony Europe