Sounds to me like there's some kind of suckout at specific frequencies, which is not at all uncommon, and will vary entirely from room to room. My room has a suckout at around 200hz, clearly visible every time I've done a graph of the room response.
FWIW I'd have my doubts that insulation batting had any effect on bass in the previous room, but would defer to other experts to say for sure. And what is "plaster covered drywall"? Do you mean the older style lathe and plaster (which is outstanding for a listening room vs. drywall in a single layer which is not nearly as tight)?
FWIW I'd have my doubts that insulation batting had any effect on bass in the previous room, but would defer to other experts to say for sure. And what is "plaster covered drywall"? Do you mean the older style lathe and plaster (which is outstanding for a listening room vs. drywall in a single layer which is not nearly as tight)?