What and measurement microphones do you own?
Are you trying to on an existing copy of Smaart v6? smaart v6 software verified
To obtain accurate SPL readings in Smaart 6, the RTA display needed recalibration to an external reference. The signal level readout tracked the input assigned as the SPL Source in the Audio I/O tab, typically targeted to the input channel carrying a signal from a microphone when measuring SPL. The procedure involved setting the RTA display to a fractional octave frequency resolution, setting the gain of the microphone preamp and sound card input controls to a useful level, and then using the calibrator to determine the offset. What and measurement microphones do you own