I read from several sources that the loudest sound ever made is over 200dB either from earthquake or *insert powerful bomb name here* explosion. Unforunately I don't know at what distance these volumes are measured. I thought for every speaker you add, you gain 3dB. If they're co-located, it gains 6dB. I'm not sure how co-location works for 3+ speakers, so I'm going to pretend co-locating speakers only result in 3dB increase per speaker. You can easily find speakers that can play over 100dB at 1 meter. If you get 50 speakers playing 100dB at the same time, right beside each other, you'd get 250dB at one meter, right? You'd also get that with very little energy. Assuming each speaker has a sensitivity of 88dB with 1 watt, it only takes 16 watts to reach 100dB. 16x50=800 watts. I realize I'm talking about 1 meter, but you only need two extra speakers for every doubling of distance. So even a mile away would only need 20ish more speakers for the same SPL. Am I right? If I'm not, could you point out what is wrong?