關於耳擴的問題, 上週末寫信給去BMC, 以下節錄客服的回覆:
1. There is a balanced LEF output stage which internally has a 2 x single-ended-class-A driver outputs for inverted and non-inverted signal per channel.
2. Line and headphone are fully balanced and have their own individual I/V conversion, DIGM and LEF stages.
3. The current is limited to 200mA for avoiding headphone damages for 32Ohm and lower. Otherwise the PureDAC would deliver 5W into the headphone which no headphone can stand.
4. The Digital Intelligent Gain Management (DIGM) optimizes the necessary gain for different headphones just by using the volume control.
5. It delivers a ready output voltage out of the I/V converter of the DAC, without an extra amplifier stage.
另外一點, BMC有注意到這邊討論, 認為用疊加的方式估算PureDAC的等級是錯誤的
入手耳機種類數目累積： 耳罩109 + 耳道42； http://sopp06.blogspot.com/
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