The bass alignment filters are necessary for the speakers to perform as intended, though we may no longer appreciate the inexpensive (by today’s snob standards) design used. The idea is usually still used in studio monitors in order to maintain the appropriate bass balance in very different locations. Something very expensive and difficult to do in passive speakers.
Users have had great success replicating the effects by using Roon’s EQ or a variety of digital EQ’s.
So, I’d say you need the curve, but not necessarily the box.
