Question: What would be the formal equivalents of:

```
Dove vi siete conosciuti?
Stavo parlando con voi.

```

I read everywhere that `Loro` as plural formal 'you' is restricted only to very formal written work. What would be the spoken equivalent, and which verb conjugation would that pronoun take?

Answer: 
Short answer: it's really uncommon to use `loro` in this case. You may want to use `voi` even in a formal conversation.   

Why? I don't really know. Perhaps, because `voi` was used in the past for the `plurale maestatis`, hence it already contains this formal meaning. 

However, even if it's uncommon, you could use loro:   

`Stavo parlando con loro`   

`Dove si sono conosciuti loro?`   

But, believe me, the person to whom you are talking will probably not understand. He'll look around and then ask you "loro chi?" :)
In modern Italian language "voi" means you (plural). The pronoun "loro" means they and is used even as honorific plural form.

However in northern Italy old people used "voi" as honorific form when they talked to their parents.