SPL Pro is a professional-grade sound level meter for your iPhone. It incorporates all the features of a dedicated SPL meter -- ANSI modes Slow, Fast, Impulse, Peak, and Leq, A and C weighting, Octave band filters, and the ability to be calibrated. SPL Pro conforms to all features of the ANSI and ISO standards for averaging sound level meters. To obtain this performance level, you will need to use SPL Pro with a suitable microphone.
- Slow - this mode uses a 1-second decay time
- Good for getting a general reading of the ambient sound level
- Fast - this mode uses a 125ms decay time
- Impulse - not used very much, normally Peak mode would be used
- Mode has a 35ms decay time
- Peak mode show the peak value received since the last screen update
- Tap the Sine icon to turn on the pink noise generator output
- Turn this switch on to route the filtered input signal to the output
- Low range - with the internal iOS microphones, this will cover a range of approximately 30 - 100dBA SPL
- High range - this will extend the range to 50 - 120dBA SPL
