hp/lp filters = high pass and low pass filters, for the mains and subs respectively, the most critical part of bass management. Other aspects would be the frequencies where those filters are applied, slopes of the filters, phase of the sub, and any further eq capacity. Analog is not inherently wrong, just kind of archaic when processing can be done in the digital realm, as even the lowliest of AVRs can do these days.
I wouldn't consider the fairly rudimentary and analog controlled bass management of the Halo a deal breaker by any means. For the two channel retro grouch with somewhat deep pockets and who wants to add a sub or two, that capability is it's saving grace. Well, that, and it's a very capable amp.