Just ran some initial spectrum analysis with SPL pro on a tablet and REW. I'm pretty sure most of the top and bottom discrepancy are from the mike in the tablet, but it was amazingly flat from 120 through about 12,200. We'll see what happens when I get a real SPL meter and loop it back into REW. Are there templates for meter's coloration? Most of the cheap ones list, like 240-12000 range, how do I get accurate data from a non-accurate device?