Thank you Wayne for your extensive answers.
When it comes to the corner bass bins: how far away from the corner can one put a floorstanding object ( f.e a book shelf) without affecting the sound / output from the corner bass bin?
How rigid must the walls and floor be in the corners for optimal bass sound?
I think I have found a forwarder, thanks for the tip! How much will a pair of flat pack midhorns wiegh?
BR Jakob