Saw the framing again this week. Work out your room's square footage, and that tells you how many subwoofers you need. I want to push back on that, because square footage is close to the least useful number in the whole decision.
What actually decides it is the room's modal behaviour and how many seats have to be right. A single sub in a rectangular room produces a pressure pattern with nulls in fixed places, and those places do not move because you added a rug or subtracted twenty square feet. Two subs placed as a matched pair, or four in a symmetric layout, exist to flatten seat-to-seat variation, not to make the room louder. If you sit alone in the sweet spot every night, one good sub with correction can be fine in a room a lot bigger than the charts suggest. If you have three people across a sofa and the one on the end never hears the low end, no amount of extra displacement fixes that. Placement does.
Ceiling height and construction get left out too. Two hundred square feet with a nine-foot ceiling and a hollow door is not the same load as the same footprint sealed under a ten-foot vault, and the second one will eat a sub whole.
The one place square footage earns its keep is a rough sanity check on displacement. A very large open-plan space genuinely needs more moving air than a sealed 12 by 14, and that is worth knowing before you buy. But it is a starting point, not the answer, and it is not a sub count.
What made the actual difference in your room, adding a second sub or moving the first one?
What actually decides it is the room's modal behaviour and how many seats have to be right. A single sub in a rectangular room produces a pressure pattern with nulls in fixed places, and those places do not move because you added a rug or subtracted twenty square feet. Two subs placed as a matched pair, or four in a symmetric layout, exist to flatten seat-to-seat variation, not to make the room louder. If you sit alone in the sweet spot every night, one good sub with correction can be fine in a room a lot bigger than the charts suggest. If you have three people across a sofa and the one on the end never hears the low end, no amount of extra displacement fixes that. Placement does.
Ceiling height and construction get left out too. Two hundred square feet with a nine-foot ceiling and a hollow door is not the same load as the same footprint sealed under a ten-foot vault, and the second one will eat a sub whole.
The one place square footage earns its keep is a rough sanity check on displacement. A very large open-plan space genuinely needs more moving air than a sealed 12 by 14, and that is worth knowing before you buy. But it is a starting point, not the answer, and it is not a sub count.
What made the actual difference in your room, adding a second sub or moving the first one?
