subs
It seems the more I do this audio thing (all my life) the more I learn. My most recent lesson was getting a nice sub (Hsu Research VTF-3R Mk II) and figuring out where to put it. I would hope a store could figure it out better than me, but only a few try. All subs can produce low to very low frequencies, but how they do it is what's important. I lucked out and got a great sub. Now I have figured out a great location for it after much trial and error. My guess is that the store didn't know where to put it, or the room was not enclosed, or it wasn't tuned properly with the setup. In any event, pick a price you can afford, match the specs of the sub with your room and listening preferences, and try it out. Don't decide until you've really done the work and properly positioned the sub. Then, you'll know if it works. Good luck! Let us know what you decide.