How big is your room can you give me dimensions? Also what are your goals with new subs. If it's a smaller room are you trying to hit 30 to 25hz. Or do you want 20 and below?
Infrasonics can be annoying to anyone your living with and you said it was for your bedroom right?
If you don't need infrasonics there are a lot of good options on the cheap and especially on the used market and refurb businesses