Strange Sounds

You always ignore those least significant things past the 11th digit until you need them in the end.

We got these sound recording devices from all over the globe. They're outputting these weird noises and their strengths in db. To simplify the calculations, assume a point source acoustic power of 10^5 and use this calculator:

http://hyperphysics.phy-astr.gsu.edu/hbase/Acoustic/invsqs.html#c3

59975417_2265417096830353_49920953348731

16.44070464786

14.48256514194

21.68889407750

Nolan

18.10471510425

18.47155787638

25.8321895219

16.1357969729

17.186298458

15.865581198

57311562_614958408989697_796331112994019

16.704332254143

17.949166880441

24.427705866305

?????????

23.395763020931

21.927579061853

15.97318574250

Removed

14.45771650680

19.6814650342

21.3320809380

59121053_1021994671319696_58018580965149

26.076315618186

21.574830581466

17.502158813833

19.602052875265

22.881676759801

16.75298359719

Alpers

20.09501464459

17.7538377416

24.5060888627