Nope, you pretty much nailed it Nick, the fact is that you need large volume displacements of air to be efficient at low frequencies, planars don’t move very much without high distortion, so the only way to go about it would be to have a very large surface area instead. This is impractical in terms of cost, size and in general, planars simply weren’t designed for this use case, the intent was large surface area for the size, but scaling up would introduce complexity too much