[Avodah] How do Chabad deal with the Amen of Krias Shema

[Dr Isaac Balbin]

Picture the scenario, you are a chabadnik and normally you don't say the Bracha immediately before Shema loudly, and in fact are basically inaudible when you are Chazan, so that others don't need to be in the conundrum of saying Amen.

How though, as a Chabadnik or anyone else who follows this practice, do you deal with a Chazan who says the Bracha loudly and clearly.

Do you say it word for word with him, like others?
Do you simply ignore what he said and not answer?

With Go-al Yisroel, which I understand you are meant to say audibly, many finish their own bracha and commence Shemoneh Esreh so that they won't be in a position to say Amen.

The one Bracha where everyone says Amen after, is Boneh Berachamov in Benching.

Sefardim of course have no issue saying Amen after their own Brachos as per their Rishonim/Poskim.

I don't know if this is at all related to Brich Shemai where (if you aren't a yekke or litvak who doesn't say it) some end with an Amen and others don't.
I think there is a relationship here too.