My SB4000 doesn't hit those 20s with authority, but it still has more than enough output and my room is quite large too. If that bottom octave is important to you, you may not love a sealed sub, but I prefer it for music. I do miss the deeper tones with some movies vs. my old Adire Tempest, but SPL has never been an issue and it takes up about 1/5th the space lol. I don't think dual sealed subs would disappoint either, depending on what you're after.