Indigo 應該算有內建耳擴了吧?依網頁規格來看:
http://www.echoindigo.com/content/info/techspecs.html
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Specifications:
Supports true 24 bit, 96kHz audio
High quality digital to analog converters
Motorola DSP
High quality headphone amplifier
Analog volume control knob
Greater than 111dB Dynamic Range (A-weighted)
Better than 0.003% THD+n @ -3dBFS, 1 Vrms output level
Frequency response of 10Hz – 22kHz, ±0.25dB
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以
Tom 的網頁說明來看,DAC 用的是 AKM 4393,amplifier 則是
Analog Device 的 SSM2135。
要接 iCute 比較麻煩,所以我先試接了 HeadRoom TAH。結果大概是 Indigo 出力夠猛,把 Indigo 音量轉最大餵給 TAH 時,一些摔炮式的爆音會隨著某些鼓點一起出來。