I prefer ATC SCM50ASL and larger models to passive IB2S.
Some may prefer an apparent low end extension of IB2S, but that comes at price. Active ATCs give you better window into the recording, the line of hearing things never heard before is what comes to mind, but not through hyped up presence region or higher frequencies, there is a clear separation of instruments, even when they occupy space near each other, individual drivers never calling attention to themselves, I am convinced all being the product of superb integration of drivers not being possible with passive cross-over. On passive speakers you simply do not hear what you do on active ones or on headphones.