I though that I just calibrated my SPL meter in the REW program. If I need to get a file, where might I get one?
Both the soundcard and the meter require compensation for their inadequacies.
The soundcard is taken care of by running a routine that measures the response over a loopback cable and a calibration file is created.
That obviously isn't possible for the meter, so a calibration file is required to be loaded into REW. There are a few ways to get a calibration file. You can get the meter/microphone calibrated at a lab. You can use a generic file that we supply on our Download Page
if you are using a Radio Shack, Galaxy or Behringer meter/mic. You can create a file from a frequency response chart over the bandwidth supplied on the chart.
Read and become familiar with the REW HELP files
and the REW Cabling and Connections Basics
Also note the REW information Index