Originally Posted by Carl
Originally Posted by Tintin
... BUT you can just run Meridian speakers from the HD621. This is sort of "frowned on" ...
Whilst possible, in practical terms this is a non-starter.

No SPL calibration.
No Distance timing calibration.
No ...

I think "non-starter" is a little hard. If you're going down the M3, pop in for a listen...

There is a fair amount of calibration available on the audio set up on the Oppo, speaker distances, trim, speaker size/bass management.