Framed my 10x12 shed studio with 2x4s 16 inches on center and it still bounces when I play bass, wish I'd gone 12 | Backyard Studios - The Design Community Hub
Did the same thing with my guitar room, 16 on center and the whole floor shakes when I hit low notes. My buddy framed his at 12 and you can barely feel a thing, so yeah, should've listened.