It is the Mini USB DAC by HiFIidiy.net. Granted, it is not the best DAC out there. But given its price (< HKD900), it is tough to beat in its own class.
This DAC is based on the Texas Instrument PCM1793. And rumor said that the headphone amplifier part is a clone of the Solo.
But to my ears, my DIY PIMETA sounds much better that the built-in headamp.
On the left is my DIY PIMETA headphone amplifier, with Analog Devices AD843 op-amps installed. (If you love pop/vocal and is not a bass-head, I strongly recommend the AD843 op-amp. It might not has the details of the OPA627 / OPA637, but the tone produced by AD843 beats them all (even the OPA2111 that I have can't beat the AD843).
My current setup is: Pioneer DV-636D -> (S/PDIF) -> DAC -> PIMETA. The S/PDIF cable is a Canare cable. There were debates on the net that whether a RCA cable can really make a real 75 ohm coxial cable. But nevertheless, this Canare cable with the designed plugs seems to be doing fine... at least to my ears (These Canare plugs require a special crimp to assemble the cable... so I bought this interconnect directly from a studio shop).
The analog RCA interconnects are DIY ones made from Swiss Gotham GAC-1 cable with Canare plugs.
The 牛奶妹/牛奶仔 etc are amplifiers. They amplify the sound and provide volume control etc functions.
DACs (digital/analog converters) are something else. They convert digital signal (e.g. those zeros and ones read from a CD disc) into analog signal which human can listen to.
So a general setup would be: CD transport -> DAC -> amplifier -> headphone
咁 ... o的手提CD機(未駁headphone時)係咪即係= CD transport + DAC + amplifier 呀？
係呀~ 手提機例如 discman 因為要方便用家，所以除左有光頭讀 CD 上的數據 (即係 transport 果一part)，仲有內置 DAC 同 amplifer。咁用家直接插上耳機就有得聽音樂。
有o的手提(或者大部份o既座檯) CD 機種會有所謂 "line out" 輸出。意思係唔經內置o既 amplifier 出聲。即係只用內置o既 transport 同 DAC，跳過 amplifier 一欄。係咁情況之下，失真會少左，不過就失去左用內置音量調節器o既功能。用家可以用外置o既 amplifier (例如你見過o既「牛奶妹」) 做信號放大同調節音量。
咁再有o的機為左俾用家有更多選擇，又或者「x忽痕」時有野玩，可以將由 CD 光頭讀到o既數碼數據直接輸出。咁用家就可以自行配搭 DAC 同 amp。
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