The Allen & Heath GX4816 is a 96kHz audio expander designed for SQ, Avantis, and dLive systems, offering 48 remote-controlled mic preamps with phantom power indicators and 16 XLR line outputs. It features two DX ports for additional I/O expansion or ME personal monitoring integration (with SQ/Avantis), making it ideal for portable PA setups requiring high channel counts and flexible stage connectivity.