How did the BNC connectors work as both G68 use phono. Did you change fittings or use adaptors. If adaptors, that's an inherently flawed solution if you after a quality boost IMHO.

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