Can't speak to the passive ones, but I use the active for acoustic guitar & vocal solo stuff. Good sounding speaker. Not quite the round low end of a 15, but compared to the elx115p it had less of the 2-way 'hole' in the mids. With appropriate power I'd think the passive would be identical, so the active reviews should hold true.
Warwick Corvette $$ 5 > X2 > VT Deluxe > Tech21 Blonde > EHX Freeze > Acme B2's/IEMs/Markbass cmd121p