For Q2, yes, you need an external amplifier.
I think the Beolink Passive from B&O can be used as an exernal amplifier, and is quite good.
I am not very good in german but I think this is one from detoma, that would work fine as well.
http://www.detoma.com/download/A102_d.pdf
They do not have the same power, so you may see which one is the most appropriate.
p.