The size of FIIO Ka17 is indeed larger than its own KA5 KA13, but the flagship "small tail" AB of Zhenhe and its friends, "in terms of figure", is also between the best. But after opening the package,The sentence "This is actually a mini desktop headphone amp" is too eye-catching,And after playing with KA17 seriously for a while,For FIIO, you need to open up the pattern,Don't use inherent thinking to copy rigid ......
About KA17KA17 did not take the previous KA series "Little Tail" by FIIO X Jade Audio co-branded form,This time KA17 only has 1 FIIO logo,And it is in the form of FIIO flagship "Little Tail",This time there is no link to send a leather case to the order,The package comes with a leather case! The design style of the outer packaging belongs to the kind of ...... that you know at a glance that FIIO produces
Regarding the shape design of the KA17, you can simply and rudely understand it as a larger circle of KA13, but it has become a piece of 0 in the window opening part of KA13The 91-inch dot matrix display ......
This time, the unboxing link of the water is mainly due to FIIO piling up too many ruthless goods in ka17, so the space is left for questions about what is in ka17! 
Desktop mode" since M17 began,Successively in Q7、M15S、Q15 tried and tested repeatedly,This time FIIO finally stretched the magic grasp to its own "little tail",KA17 has an independent D.Mode switch, after the KA17 is enabled, it will automatically adjust the DAC, headphone amp power supply, and headphone amp driver to the high-performance state. When the USB power supply is sufficient (some laptops have sufficient power supply, there is no need to plug in an independent power supply), the rear stage THX headphone amplifier of the KA17 adopts four op amps with parallel wide current, with a single-ended output power of up to 270MW+270MW, and a balanced output power of up to 650MW+650MW, and the output power is indeed close to that of some desktop-level devices......
The KA17 uses two ESS newly released dual-channel series flagship DAC ES90659Q, based on the ***32bit Hyperstream architecture, to achieve a balance of higher performance and lower power consumption, and further reduce the digital noise inside the DAC to bring cleaner sound. 
KA17 is equipped with XMOS 16 core, which is not used much on the small tail, XU316, which has lower latency than ordinary USB chips, more stable transmission, better compatibility, and can be adapted to various audio sources and sampling rates with audio dual crystal oscillators. Based on the XMOS XU316 platform, FiiO's engineers have specially developed the PEQ adjustment function, which supports 10 customizable frequency points for allocation, and through FiiO's self-developed adjustment algorithm interface, the frequency, gain and bandwidth of EQ can be finely adjusted, enhancing the playability ...... of the KA17
The THX AAA 78 headphone amplifier technology has been polished in M11 Pro, M11 Plus and other models, and has now been fully advanced to the THX AAA 78+ version, and the KA17 is the first show on the small tail. The KA17 is equipped with a new THX AAA 78+ headphone amplifier architecture with 4-channel balanced + 8-channel op amps in parallel, which brings higher output power and makes the sound more natural, realistic and ......
KA17 is equipped with three high-level precision power supply designs, including first-stage filtering + overvoltage protection, second-stage DC-DC boost conversion, and high-precision LDO voltage stabilization. It also includes three independent power supplies of digital signal part, analog conversion part, and analog amplification part, as well as more than ten subdivision power supplies. KA17 adopts the design of separating the digital board from the analog board, and each is equipped with a shielding cover for isolation, which can avoid crosstalk and effectively ensure the accuracy and dynamics of signal processing. 
At the system level, KA13 is currently one of the very few built-in bilingual menus"Little tail",Chinese display can be more intuitive to understand the functions,It is more convenient to operate with physical buttons,Especially with the mobile phone FIIO Control for PEQ setting ......
Let's talk about soundFIIO doesn't seem to have the problem of touching prizes in products like small tails, whether it's KA5 or KA13, or BTR15 BTR7's sound is "quite lacking in morality" at its price! 
Does D·Mode really explode, or is it just a blast? Is there a difference between starting D·Mode when the computer is fully powered and starting D·Mode when plugged in with a power supply? Is it possible to make a sound without turning on D·mode?
So the original picture is useless here! I slammed the KA17 directly to MBP, and Apple Music went up! I used Lebi's WP2+ (this line can almost buy 2 KA17), and the external power supply is DDHIFI's TC02C and Xiaomi's 65W! Finally, use Eller's Flame private model with Toxic Cables BW XL upgrade cable!
First of all, the KA17 driver flame sound in normal mode is very neutral and delicate, the big dynamic can be opened, the details are not hurried or impatient, and the scene of daily brushing John Williams can give people a good sense of stability, and it is rare that FiiO has done a good job of musicality this time......
Start D·mode without inserting the power supply port,The loudness of the sound will change significantly,And the sound is not gathered in the middle to form the so-called false high density,It is still a very loose state,The texture of instrumental music has been improved significantly,Resonance、Overtones、The residual sound is clearer,The sound is in the case of large opening and closing,It still maintains the overall smoothness and smoothness of the sound,KA17The sound base belongs to the ...... with a very strong ** aesthetics
Since it's a mini machine,Then FiiO's own FT5 must be taken out to embarrass the ka17,After turning on D·mode, FT5 can listen and sound good,If you have to wait for it,Then it is not as good as a serious machine in terms of micro-dynamics and details,But the overall sense of frame and details are not bad,After all, many portable ** devices may not be able to do this sound。 After trying to turn off D·mode, the sound is much more fleshy, and the details and micro-dynamics are erased a lot, especially for the performance of overtones and reverberations, which are much more convergent, but still the kind that can be listened to!!
In terms of sound, I think the success of the KA17 is not the so-called D·Mode desktop mode,But the sublimation of FiiO's KA17 sound tuning,It's really hard for you to associate this sound with the early FiiO,And the most recent one is Q15Some similarities with KA17 in some directions,But if you want to say that the sense of luxury is still obviously inferior to KA17!
Should you buy it or buy itRecently, FiiO's KA17 is really not the one I am most optimistic about, after all, there is a desktop flagshipR9, as well as the main retro CP13 (even my mother is paying attention to it) tape player, but the voice of the small tail of U1S1 can really do a lot of 3K or so ** device, and in the small tails I have played at present, I can properly do myself into the top three. So if you want to find an entry-level **device, you might as well consider the ka17, you want to find a small tail of about 2k to trouble and give a chance to see the ka17 ......