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1 số ứng dụng
http://dinhbas.blogspot.com/2012_10_01_archive.html
http://hocdungphim.vn/khai-niem-ve-3-dai-tan-so-am-thanh.html
http://www.otofun.net/threads/nho-cac-cu-day-vai-duong-co-ban-ve-loa-amply-va-subwoofer.496189/