Open a certain east, search for "portable decoding ear amplifier" or "decoding small tail", you will search for a bunch of various manufacturers of class D ear amplifier, iBasso Abasso, XDuoo degree, mountain spirit, FiiO Fei Ao, Lepi, Haibei, Colorfly rainbow, etc., the price is basically in the range of 200-700 yuan, most of them in the price of 300-400 yuan, how much sales, the evaluation is not the same.
Maybe speaking of this, some music lovers who have never used the portable ear "little tail" will wonder, what is this thing used for? It is easy to explain that there are some such groups among music enthusiasts, that is, they may use desktops and professional front-end players at home, but as long as they go out, they no longer want to carry those HiFi "golden bricks", but only carry a mobile phone as a sound source, which is called "the pursuit of portability".
You say that they are in order to be portable, but also unwilling to choose a more portable TWS Bluetooth headset as a device to listen to songs, but also to "stubbornly" choose their own wired HiFi headphones, you will not think that this kind of listening enthusiasts are large, and portable small tail in the solution to the current mainstream flagship mobile phones are no longer equipped with 3.5mm audio port at the same time, but also increased the small decoding ear amp, compared to the kind of Type-C to 3.5mm sent by the mobile phone is obviously many levels higher. This is the main reason why portable ear amplifiers also have a lot of sales, because this kind of group needs such equipment, uh... I have too.
But to be honest, portable decoding "small tail" although it can improve the playback quality of mobile phone audio sources to a certain extent, but the traditional "small tail" mostly uses D class very low-end cheap decoding chip, this class D digital amplifier, the working principle is to use a very high frequency transfer switch circuit to amplify the audio signal, the advantage is high efficiency and small size, but the disadvantage is also obvious, that is, the distortion is larger, although it can help promote some high-impedance headphones, but the larger distortion has actually lost the quality of HiFi listening. This is also why when I saw that Heffield MAN came out with this DAC chip portable decoding ear amplifier based on the R2R architecture, I especially wanted to try it and see how Heffield man's product, which cost up to 2499 yuan (to the hand price of 1799 yuan), was it a pit? That's only known if you're in the pit.
The volume of Heffield man HM800 is quite small, palm-like size, 33mm * 19mm * 9mm, the weight is only 9.65g, this is the state after the connection, to put it bluntly, it is equivalent to the headphone cable to increase a wire control, the weight of 9g will not affect the wearing experience of the headphones at all.
The two ends of the HM800 device adopt a detachable design, one end is the Type-C interface, which can facilitate the Android flagship users to easily connect the mobile phone in a C-C way, and can also purchase the official Lightning to Type-C cable; the other end is the mmcx interface, which is L and R, similar to the mmcx headphones.
In the early version of the HM800 last year, the impression is that it does not support the replacement of wire, but after the official release of the Haeffieldman HM800 can be described as full of sincerity, the standard MMCX coaxial, 0.78 pin, 0.75 pin three kinds of common HiFi headphone connector socket method, almost covering all the headphones on the market except 2pin (S).
In the above figure, respectively tested 3 different interfaces of headphones, the official standard cable specifications are still quite good, whether it is mmcx or double needles are very close, double pin way plugs and removals are relatively smooth, many users who first contact mmcx coaxial plugs may feel very tight when plugging and unplugging coaxial, here to share a small experience, first of all, the fingers can not be wet and easy to slip, you can use a paper pump, and then when pulling out with the thumb nail slightly inserted between the interfaces, With a little pulling strength and then a turn down, this trick is not happy, I have even seen someone in order to pull mmcx coaxial wire are broken and broken down, haha, hurry up try my trick.
After connecting the HM800, it is almost not much different from the daily feeling of wearing wired headphones, but the sound is much worse. We all know that the hardware chip of the mobile phone will not focus on audio decoding at all, after all, limited by the function of the mobile phone and the cost of the hardware, the manufacturer is more refined than the consumer, what "the mobile phone does not make money is to make a friend" is purely used to cut leeks of the big lie, so the sound quality of the mobile phone, especially the driving force, is stretched, for the impedance of small sensitivity high sensitivity of the headphones the problem is not big, but for the high impedance of the headphones to launch the sound is very poor and very poor.
The soul of Heffield mann HM800 actually lies in this, after Heffield Man developed the CHIP of THE HEYMALAYA Himalaya R2R architecture DAC module, the HM901R began to sell well, and now, in the small HM800 can also be applied to the Himalaya professional chip, it can be seen that Heffield man also attaches great importance to users who use mobile phone audio sources. This Himalayan chip has very low audio segment out-of-band noise and low energy consumption, supports the MOST COMMON IIS audio interface transmitted PCM music signals, the highest resolution is 24Bit, the signal-to-noise ratio is 112db, and the total harmonic distortion (DAC module) is only 0.0025%, comparable to PCM1704J, reaching a high level in the industry. In the past products, HIFIMAN is in the high-end player will use R2R DAC, and now can see the HM800 based on the R2R architecture of Thexal hardware, indeed can see The sincerity of Haffieldman.
HM800 decoding amplifier belongs to the independent Class A and B amplifier (CLASS AB), compared to the high efficiency of Class D but the characteristics of large distortion, Class AB power amplifier solves the problem of crossover distortion of Class B amplifier, and the efficiency is higher than that of Class A amplifier, coupled with the very low power consumption of The Himalaya, so from the hardware indicators, it has directly crushed a variety of Class D portable "small tails" on the market.
In the actual audition experience, the mobile phone is connected through a portable small tail, although the thrust is there, but the song appears to be more "paste", the sound field compression sense is larger, not to mention compared with the front-end player of thousands of yuan, I am afraid that even the player of one hundred yuan is difficult to match. When switching to HM800, not only the thrust is greater, but the sound texture is immediately improved.
In the song "Silk Road", the left and right ear separation of HM800 can be clearly perceived, based on the design concept of NOS (no supersampling filter), the silent background of the song between paragraphs is particularly "black", so the sense of purity given by the sound is particularly easy to feel.
When listening to the prelude to Xiao Gang's "Dusk" song, you can also strongly feel the change of the longitudinal sound field, compared to the portable small tail decoding, Heffieldman HM800 obvious left ear instrument sound and right ear instrument sound vertical level positioning is accurate, can hear the two position distance is obviously different, the formation is clear, the sense of space is stronger.
The emergence of Heffield HM800, can be called a new revolution in the field of HiFi, the current market with "small tail" appears all kinds of portable decoding ear amplifiers, are only to increase the thrust, only HM800 built-in self-developed Himalayan DAC chip, really from the sound quality, not only large thrust, timbre is better, only 20mw of energy consumption is not much to eat mobile phone power, the price of 1799 yuan is equivalent to buying a mini version of HM901R for themselves, "into the pit" The Haeffiman HM800, I can only say, is good value for money, plus a re2000 Silver, and that's the best combination of HiFi!