I wonder if it makes a difference the order as Meridian says that the Bluray should go directly into the HD621, strip the audio, and then on to the Lumagen. The person at Meridian didn't know the Lumagen piece but he generically said the scaler should go after the HD621.
Ken

Meridian 861v6, HD621, G98, Pioneer BD-09, Mark Levinson 436 monoblocks, Aerial Acoustics 20T, CC5, SR3, SW12, Mark Seaton Submersives, QSC 322, Runco Vx22D, Lumagen Radiance XE