[brucek]

Am I on the right track in what I am trying to do?

You would require a calibration file for the Extech meter. Most Extech meters appear to be of good quality, so I suspect it's full range, but you would require a cal file to compensate for the upper and lower end. If you were just checking the crossovers, I suppose you could get away without it.

brucek

 

[brucek]

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

brucek