Originally Posted by capecodorthopod
The smilie face above is not a knock on you. It is in anticipation of a certain someone showing up in this thread and spouting nonsense about the uselessness of high output at ultra low frequencies. Or maybe we'll luck out and he's on vacation (without a smartphone).
I'll play devil's advocate here. Subsonic bass is just that: low frequencies you can't hear. Getting some serious bass below 20 hz is expensive and will take up a lot of space and electricity. Some people enjoy it, but for me it is a novelty that wore off. I would recommend that you at least go to someone's house who has a setup that can put out some real output significantly below 20 hz (real output I would define as at least 110 db at listening position), so you can see what its like, if you don't already know. Only then should you decide whether you want to chase that kind of bass. Ask them to play some test tones below 20 hz, like 18 hz, 16 hz, 14 hz, and so on, and then ask yourself, is it worth it.
I'm not telling you not to go for subsonic bass, I am advising you to get some listening experience and be realistic about the costs and benefits of it.