last updated 1/8/15 post #323. If I'm missing some impressions PM me. Link to announcement. Supports: 32bit/96khz USB audio DSD decoding Coaxial input Line in/Line out 3.5mm port Adjustable Bass (+-10dB) and Treble (+-10dB) like Fiio E17. See specifications image below to see how that affects frequency response Will dock to the Fiio E09s through the micro USB connector Pricing: Fiio E17k is the same MSRP as the Fiio E17. Availablity: Fiio E17k is being shipped worldwide now. Compatibility: Fiio E17k now uses the 11pin Micro USB connector and can connect to the Fiio E09s through this connector. The Fiio E09s desktop amplifier has not been released yet and may be released June 2015. Can connect to the Fiio X3/X5 through digital coaxial. Play digital audio through the coaxial output on the X3/X5 to the E17k. Note that any DAC with coaxial input works with any device that has coaxial output for stereo PCM audio. Reviews and Impressions: cleg - Unboxing and First Impressions bowie006 Review |  ClieOS  SwordSaintSSX  |  |  Digital7  |  |  |  |  |  |  |  |  |  JBHorne  hEddy  SoundNews E17K Review Confirmed by Fiio that the E17k doesn't support optical input: Spoiler: My personal opinions on the feature changes between the E17 and E17k The E17k losing optical input is by far one of the biggest losses for me personally and for many others. I understand that Fiio views the E17k as the DAC in the combined DAC+Amp combination of the E17k + E09s and therefore values DSD and 32/96 (placebo) over optical input. They probably had to make some tough choices in what to use and decided that the loss of optical input was worth the gain of DSD and 32/96. It's a real shame because many of the devices I would connect to only have optical output and that I must either continue to use the E17 (discontinued) or get a Modi 2 Optical/Uber or an AudioEngine D1. The E17 was a swiss army knife that I really appreciated at its price but I don't value 32/96 and DSD on the E17k over optical input. If I had to choose then I'd rather have optical. I understand that Fiio was possibly in a tough situation but I guess I'm still disappointed. It is quite a serious blow for me that the E17k doesn't support optical input. The reason is that many use soundcards such as the Sound Blaster Z for virtual surround sound and then output that virtual surround sound processed, stereo PCM digital audio from the soundcard via optical to a DAC with optical input. The reason this is done is because it allows you to use whatever DAC and amplifier you want while also having virtual surround sound. These soundcards do not have coaxial output. It would mean that I'd have to use the older E17(not E17k) which supports optical input, a Modi 2 optical/uber or Audioengine D1. I'll update this post with reviews and other information. If you've got information that you want me to add then it may be best to PM me.