Phoenix connectors is what we use in the movie industry

Parts Express Phoenix Type Connector 4-Pole 5mm Pitch 4-Pack https://www.amazon.com/dp/B00MJGPFWG/ref=cm_sw_r_cp_api_i_lATGDbXEKF7SE

That is a Phoenix connector commonly referred to as a Euro connector normally used in commercial installs. Have a look at this connector on Amazon, or from Parts Express.