Please correct me if I am wrong, but my understanding is that bass modes occur when 2 parallel walls reflect bass energy to/from to create nulls and peaks for a specific frequency depending upon the distance between the walls. Historically, absorbers have been the most common method to tackle the bass anomalies. BUT, what if we took a different approach, much like what is done in auditoriums and symphony halls. Instead of absorbtion, we change the underlying cause (parallel walls). And, instead of just skewing one wall, we create a very diverse surface that scatters the bass sound waves much like a diffusor.
So, I stumble across a product call Woodskin. It comes in several sizes that can be turned / twisted to create the diverse surface that would deflect bass sound waves in multiple direcdtions that would minimize room bass modes. I was thinking of placing a large woodskin surface on the front wall including 2 corners. See the attached photos that give you an idea of how flexible this product can be used.
Imagine that the front wall has Woodskin covering floor to ceiling in one corner. At the floor level, the woodskin in the corner would be close to the front wall surface. Then, as the woodskin traverses to the ceiling, the woodskin would undulate away from the front wall. The woodskin would also move toward the other corner, so we get about 50% coverage on the front wall.
Thinking out loud, there might be unfavorable scattering that would be hard to control. But, would this still be better than room modes.
Please let us know your thoughts. this stuff isn't cheap. It runs $75 - $125 / SF. I would put rock wool in the space between the woodskin and the front wall.