I think for those who have used the Nano 300 themselves, this has given you a clear idea of how the small FBT speakers and the still quite small db K300 compete against it.

I'm quite sure using one of these together with a Nano 300 is equally powerful and more balanced than using two Nano 300. I'm just not sure whether a Nano 600 would be superior to this combination (except for the stronger subbass).