Review on 🎙️ Dayton Audio iMM-6 Calibrated Measurement Microphone for iPhone, iPad, Android Tablets – Black by Julio Diaz

Good small and inexpensive solution for basic RTA tasks. I wanted to be able to test the frequency response of my home speakers, but I didn't want to invest a few hundred bucks in one of Dayton's (or whatever) microphones and a PC audio interface. I thought it was worth it. I use it with my Galaxy S9 running AudioTool. The speaker output allows me to send pink or white noise or music to my desktop amp and measure/record RTA data including SPL, 1/12th octave slopes, room response etc. It's accurate and consistent enough for my hobbyist's needs. Note that without an anechoic chamber, a constant 40 dB level is almost always recorded at around 50 Hz and below. This is normal depending on the environment. Record your original readings and don't be confused if you think you are getting phantom low readings. In any case, it is definitely worth the money and offers better than expected audio measurement quality.