Here are a few videos REL Technical support sent me when I asked basically the same question for my REL Stadium III
https://rel.net/before-connecting-placement/ Connecting
https://rel.net/determine-whether-to-use-high-level-low-level-and-lfe-1/ Which connection
https://rel.net/how-to-connect-your-rel/ How to connect
https://rel.net/how-to-tune-a-rel/ How to tune
https://rel.net/before-connecting-placement/ Connecting
https://rel.net/determine-whether-to-use-high-level-low-level-and-lfe-1/ Which connection
https://rel.net/how-to-connect-your-rel/ How to connect
https://rel.net/how-to-tune-a-rel/ How to tune