Maybe a little closer, there's some heavy voicing in the Big Block and Titan that's not in any of the current heads. The Big Block and Titan and M-2000 were the least popular hybrid models, but they were also the most expensive so that factors into the popularity too.
You really need to try one because your preferences may be too different from any of the current offerings (or even the Walkabout or M-Pulse legacy models). It's probably closer to the Carbine M6/M9 actually, because those were the most heavily voiced (and also fairly popular).
The most popular models in the legacy line were the Bass 400, Bass 400+, Walkabout and M-Pulse and by quite a wide margin, they were also the least heavily voiced, which is why we took our "lighten the voicing" cue from these more popular models. That doesn't mean that the other models weren't desirable though, just addressed the needs that were more outside of the main stream. In fact, there were several threads here on TB specifically on what today's player was looking for in a bass amp compared with a few of our legacy models, which is how the Subway line came to be.