I looked at the optical cables but there is a jump in pricing compared to the active. If it takes optical to get the required picture on the projector I will upgrade and use the active for my 4k tv.
LFR1100 VP180HP EP600 M3 In Ceiling x 4 M5OW M2 - Atmos rears ADA1500.5 M3 Outdoor Speakers ADA 1000.8