I live in a concrete apartment and listen in my living room. There’s nothing I can do about the very strong peak at 90 hz and complete null at 40 hz. The Fabfilter pro-Q3 I could use for the 90 hz in Audirvāna is far from transparent.
"The room can totally wreck, or make, a system"
For those interested in dealing with the most important part of their system -- indeed, the precondition for a good system: the room.