I suspect we're dealing with a case of the audiomaster "not having been told" what it's connected to, or otherwise having been set up wrong.
I feel the same. Many factors in dealing with BL5's. As they are a truly non colored and transparent speaker just like a studio monitor is. BL5's will show a piece of work, be it musical or movie for what it really is. Source material, player and setup play a crucial role with these speakers. Personally I never thought much of the BeoLab 1's as I found them to have a clinical sound with little warmth, so the jump to BL9's would have been huge IMO. However as I have both BL9's and BL5's and as good as the BL9's are there still is no comparison to the BL5's. From all angles the delivery of BL5's is far superior, in power, acuracy/detail, separation, warmth, frequency range (especially in bottom end). So there must be something wrong in the set up. I certainly have experienced this before in a store and if your dealer wants the sale that bad he/she should be willing to bring them around for a demo in your house. Mine certainly sound better at home than they do in my local dealer. With the set up 100% BL5's Should sound amazing anywhere, but of course they will always sound better in a more breathable room.