Hello, I'm very very sorry for having no time to read all the threads and search for my problem! I have to do important measurements tomorrow evening. My equipment: Superlux ECM-999 mic Focusrite Solo 2 Gen REW 5.19 on Lenovo ThinkPad L420. The mic is working, checked in Audacity (recorded my voice) but after 2 years of perfect working I'm getting very strange graphics after the measurement: https://cloud.mail.ru/public/3CEZ/6nwvSqgQJ (very sorry for this kind of link) The SPL Meter is constantly showing 50 dB (even when I'm screaming in the mic) This is nothing near my real frequency response... And earlier I had different kind of graphics in REW 5.17 with 50-150-150 Hz peaks. Looks like some AC/DC frequency problem. Maybe someone encountered these problems somehow? Should I change my equipment? I've reinstalled REW already. Sorry for possible mistakes, English not my native.