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According to Official Guinness Records,
Initially designed for the military by Danley Sound Labs (USA), the massive Matterhorn features 40 15-in subwoofers each powered by a 1,000-watt amplifier and housed in a 20x8x8-ft cargo container capable of reproducing bass down to 15 to 20 Hz and generating 94 db up to 250 m (820 ft).
For a complete list of 2007 records, please visit 2007 Guinness Records in United States.