This is 100% correct. To measure high frequency with any accuracy you really need a calibrated mic of good quality. I'd recommend a USB mic like the UMM-6, no sound card required and the price is fair.
This is 100% correct. To measure high frequency with any accuracy you really need a calibrated mic of good quality. I'd recommend a USB mic like the UMM-6, no sound card required and the price is fair.On the calibration file download page it says "Radio Shack SPL meters are limited to 3KHz" and the cal files stop at 1 kHz. So high frequency measurement isn't really possible with those.