How important is bass to you?

Many instruments can get quite low, not only pipe organ and acoustic and electric bass. And voice can get low too. There is a huge difference between a system giving you some bass at, say, 30hz and the one that plays it just as well as 50hz.
I was listening today Hellborg/Velez Ars Moriende album. The Love Death Ritual track is excellent. His custom acoustic bass guitar goes very low at certain moments. But my system gives me 'some bass' at 30hz, there is a lot more in the recording. I was upset.

20Hz-40Hz is quite a range, I meant below, say, 25HZ.
Of course 'well played' is more important, but if you can't really hear it - it makes no difference.
Not only crossover and room are critical but electronics too. Some people upgrade their speakers too quickly, many speakers are in fact better than they might seem. There is a lot that can be extracted from one great 8" driver including low bass. Not the best bass possible, not at all, but quite satisfactory.
Good bass/great midrange vs. great bass/good midrange. That's tough. I would have to listen, this can't really be decided in general. But midrange is most important, no doubt.

I can't say I like it much, but it's unusual - three different bass guitars together. Must have a lot of deep bass, but I can't hear it! I just got computer and Grado 225e phones that are separate from my system. Start at about 5:30

https://www.youtube.com/watch?v=i3fGKLHW66w

Yes, too much bass can be even worse than too little, unless you like tremors and earthquakes.
As for 'to sub or not to sub', I am open to the debate. In any case, two subs please.

OK, I'll re-phrase - at least two subs, please.