Exactly. There are three "core" cards which turn a v4 into a v6. They are:

1) IE44 digital input card, including 1x MMHR, 2x SpeakerLink and 2x SmartLink inputs. Probably the most wanted option.

2) Eight channel SpeakerLink output card. Useless if you don't have SpeakerLink DSPs, but useful to many at least in conjunction with the existing SPDIF output card.

3) New analogue input card. Useless in an all-digital system.

Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.