When a zimmun (rabbotai nevarech, etc.) is done, I have heard that the first three paragraphs should be said aloud by the leader.
Baruch Ata Adoshem Hazan Et Haolam......Baruch Ata Adoshem Hazan Et Hakol
Nodeh Lecha Adoshem.. bchol ayt uhvechol shahah
VeAl Hakol....Baruch Ata Adoshem Al Haaretz VeAl Hamazon.
I am wondering if just the end of the first and third have to be said aloud? I wonder this as the first and third end in actual brachot.
What is the rule for what has to be said aloud?
I notice there are other brachot after that though (e.g. UhVenai yerushalayim....Baruch ata adoshem bonai verachamav yerushalayim amayn) and I haven't seen that said aloud, whereas with the harachamans some do say them aloud.
What is the rule?
Are there differences between ashkenazim and sephardim in this regard? Apparently, sephardim say a bit more aloud like harachamans, but I'd like confirmation of this and preferably a source.