Some of Reference Audio Analyzer's measurements are useful:
RAA is probably the worst database out there. They have zero information on their proprietary "HDM-X" system (which looks to be a DIY rig) and the unit-to-unit consistency seems to be near-unreadable.
The general rule of thumb is this: if the database doesn't publish their methodology, system, rig and whatnot, their data is next to useless. I'm looking at you, SoundGuys.