I would post some REW graphs but I just got my UMIK1 the other day and don't think I have it setup correctly, also haven't used REW before.
When I do a measurement, the volume on the graph reads real low - like 50dbs which is probably not much above the noise floor.
Even when I turn my receiver up to 0db or higher. I turned the volume on my laptop all the way up too, not sure what else to check. Will have to spend some time in the REW forum but haven't had time.
JTR (3 215 RT, 5 212HTR, 2 Growlers, 4 S2's)
PSA (4 Triax's, 3 210T's)
Behringer (4 B1200 Midbass Modules)