Hardly any music has content below 30 Hz, but there are some movies that have strong content below 20 Hz.
Here is a list of films with strong deep bass content and graphs their frequency strength. It's pretty difficult to hear anything below 20 Hz, so you need a lot of SPL down there to make a difference. I don't think anything in your price range will bring audibility to sub 20 Hz content. Still, it can be a neat trick to play a 16 Hz tone and hear the doors and windows rattle without actually hearing the note itself. The PSA will have stronger deep bass and also deeper bass, but the PB12 has cleaner deep bass.