GLM 4 will work with every Genelec Smart Active Monitor and Subwoofer model, both current and discontinued models. It is also compatible with other Genelec devices including the GLM Kit (8300-416 GLM Adapter and 8300A calibration microphone) and the 9301A AES/EBU interface. GLM 4 will not support discontinued GLM Adapter models, Genelec’s standard Classic analogue monitors and subwoofers, or other brands of loudspeakers.