Fart-box? To each their own. I'd call a weakly-motored, high-inductance driver in a sealed box a one-note wonder/fart-box too. Won't go into what I think of that sort of driver in a ported cabinet.
I've played with multi-chamber/higher-order bandpass cabinets of one sort or another for almost as long as I have been building speakers. Some worked better than expected, some were a total waste of time and materials. I've definitely found that the higher-order cabinets have their benefits, but they are finicky to get right. With the simulation software and measurement tools I have now, things are quite a bit easier than they used to be, but ultimately, I still have to build and measure the cabinet to see what I have created.
I generally dislike ports, because unless they are large, they tend to compress at high levels. So, simple solution, make ports larger. Problem with that is when they get larger, they have to be longer, which, aside from being really hard to deal with, can shift the pipe resonances into the sub's passband. I am more interested in this sort of topology:
All credit to Circlomanen over at DIYAudio for the drawing and this concept. Drawing taken from the thread linked by
To complicate things further, a guy could taper the quarter-wave resonators and potentially reduce the pipe resonances.
I'm still at the scribbling pictures with my crayons stage, I have a few simulations, but nothing that corresponds to a design sketch or anything.
Edit - fixed image. Sorry about that. Thanks
for pointing that out.