I just got my B1 Bose bass module to AB it with my Z5500 sub( I bought my PAS with the intentions of using my existing one). As the tech guys at Bose told me,there is no comparison.I think it has to do with the crossover network.For me,the Z5500 sub was much more dominant on it's own system,as is the B1 on the Bose system.

Gary
You play out more in different venues and am looking forward to your assessment. As it stands now,I am goin 100% Bose and will sell my Z5500,or use it on my computer instead of my Z2200.
Bernie