It would not be a big thing to add some internal volume to the box if that in some way would help the transient response which is a concern I have. I can saw a 9 inch by 9 inch hole in the internal back and put a couple of 6 inch spacers and a new back expanding to near the 1000 cubic inches that way. Just do not want to bother if it does nothing for me. Costs no $ but a new box with new verneer wood, glue and all would be one to two hundred bucks I think.