I downloaded the app at lunch and ran the SPL meter in my car on the way back to the office (about 40 mph driving, no radio, windows up). On the default "A" setting it showed about 70db. When I switched it to the "C" setting it jumped up to about 95 db. I don't remember there ever being that much of a difference between the A and C setting on the RS SPL meter. Also, I thought that the C setting was the one suggested for HT calibration... I know what 95 DB sounds like on my RS SPL meter with the c setting and my car is no where near that loud. I will compare the two together if I get a chance tonight, otherwise I might not have time 'till tomorrow.
