Predicted (using the statistical model) difference between SLM (Sound Level Meter) and application measurements with increasing frequency for two applications: Bolden and KTW. Dashed lines represent Device 1, and solid lines represent Device 2 for each application. (A) Differences for a sound level of 50.9 dB. (B) Differences for a sound level of 107.4 dB. (C) Differences for pseudo-calibrated devices (D) Differences for devices without pseudo-calibration.