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１ 应内置杜比数码５．１声道（ＡＣ—３）解码器。这样您只需配备一台五声道功放及五只音箱便可组成一套真正的数码家庭影院。而某些仅具有“ＡＣ—３接口” 的ＤＶＤ则必须再购置一台带ＡＣ—３解码的功放，总投资反而多出不少。２ 应带有ＤＴＳ（数码影院系统）输出。ＤＴＳ
1 should be built-in Dolby Digital 5.1 channel (AC-3) decoder. So you only need to equip a five-channel amplifier and five speakers to form a true digital home theater. However, some DVDs with AC-3 interface only have to purchase another amplifier with AC-3 decoding, but the total investment is much more. 2 should have DTS (Digital Theater System) output. DTS