informacion en ruso sobre recintos acusticos http://www.radiolamps.ru/articles/acoustics/acoustic_18.html
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informacion en japones de audio amplificador de 70W, salida a fet, http://www.ne.jp/asahi/evo/amp/K3497J618_2/2sk34972SJ618amp.htm
http://www.ne.jp/asahi/evo/amp/K3497J618/report.htm
amplificador stereo en japones con el LM1875 http://www.mi-take.biz/system72/PowerAMP/PowerAmp_LM1875.html
mas en japones amplificador de audifonos con el LME49600 http://www.mi-take.biz/system72/headphone_AMP/headphone_amp.html