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I agree Dr Griffin they most likely are not as accurate but they should do a half way decent job when money is tight.

They may not be perfect and it may not be as good as a actual SPL meter. But I felt that until I can get around to getting an SPL meter the app should help till then. I also downloaded an app called RTA Analyzer which may or may not do a good job but I am going to try it.

SPL Meter by Keuwlsoft and Sound Meter - Dcibel by Melon Soft they are both free.

I just found a SPL app for my smart phone and ran it on my Galaxy S6 and found that the levels from channel to channel are where they should be.

I calibrated my system manually by ear since I do not have an SPL meter.