Regarding the room size of the Kawero´s: The work in a big ballroom like they did at RMAF 2008 in the Hyatt (and received Best sound of the show awards from many publications) and they work in a small room like in RMAF 2009 (where the also received a lot of Best sound of the show awards). The design rationale of the Kawero speakers takes the room acoustics into account. Please remember that Kaiser´s main business is professional room acoustics. Therefore the room gain is considered in the design (Kaiser will propose a matching woofer for the customer, there are several solutions available depending on the customers room acoustic) The main approach is to harmonize the direct sound field with the ambient sound field (sound power response).
The recommended listening space is from 18 square meters up to 200 square meters. The recommended clearance behind the speakers is from 80 cm up.
But I will not go to deep into details, if your friend is willing to listen in our showroom, he is more than welcome.
Of course we will refund the traveling costs when he will decide to purchase a Kawero.
Best regards Rainer Weber Technical Director Kaiser Acoustics