Does your 808i have din comms (straight plug) or bnc (twist to lock) ? If it has bnc, then it should work with g12.

The current 808i only seems to have din and speakerlink.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).