Running multiple lines of descent (simultaneous revisions) across different nearly identical products is a real PITA especially if you have limited or inexperienced resources to do it with. Having been their myself on many occasions, I sympathise with Meridian and commend them on going back through older products where I am sure the reality is that in real numbers there are probably very few of these instances in the wild and of those of them that are, the problem was probably never noticed until bought up on here otherwise the problem would have been discovered years ago and fixed before it had a chance to propagate into newer kit.

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