Quick Start Guide

Last Update: 1/4/21

Applications Manual for Sound Recording with iOS

You see “External Mic.” Indicated at the top and the large audio level meters. Below the meters is the Input level control.

It should initially be set to 50%, which is the calibrated level of the SP15. That level is set so that 0dB on the meter scale is

equal to a level of 120dB SPL.

Meter check and Level Testing

The meter scale calibration is a tapered log scale, which is very useful for monitoring the recording level. The two red

segments indicate a 3dB range, which borders on the maximum level before distortion. The yellow segments show the

signal level between -12 and -3 where the normal level peaks should register. The green segments show the levels below

-12dB where the average signal levels should lie.

24 18 12 6 3 0dB

This App’s audio processing is very linear with no signal compression. The table shows the playback output signal tracks

the input exactly and conforms to the level displayed by the meters when making the recording.