https://tiebac.baidu.com/p/7607355737?pn=1
(DeepL translation.)
In life, I am always working hard on my own towards my own expectations, I can achieve my own goals, even if I am not late for work today, I will have a slight sense of achievement, and so will most of the people around me. As a consumer in the information age, there are so many needs that you can't accomplish on your own, such as listening to sound. My expectations for a portable player are actually quite retro, that is, I want a product that can achieve the sound performance of the portable desk machine originally envisioned by NBR 10 years ago, and the operation can keep up with the streaming media era. With the recent release of the M17, I was able to fulfill my dream.
The M17 has a smooth operating system, a clock management system with femtosecond crystals, good support for network playback (including DLNA, airplay, etc.), good Bluetooth support, and a shielded thermal power supply system. I'll start sharing my experience with it slowly below. The text that follows will be long and I will share it by module, just read the parts that interest you.
Appearance Operation
The M17 is user friendly in that there is no holster text, which is good news for those who are too lazy to write reviews. It comes with a DC adapter, leather holster, and fan dock, so once you open the box you have everything you need to get the full experience of the M17.
The overall shape of the M17 looks more like a computer case to me, although it is officially advertised as a mech style, the ambient lighting on the side and the thickness always gives me a feeling of an ITX case. In fact the M17 is ok in size, it is mainly the thickness of the body that affects the impression, I personally don't find it large and I have no problem holding and operating it with one hand. So if you say you classify it as a portable device, this thickness doesn't look like it, but the size of the M17 doesn't qualify it as a mobile device either, and this classification depends on the size size that the user accepts for themselves.
The ambient lights on the bezel and volume knob are a great feature of the M17, with 12 RGB lights giving the M17 a sci-fi inspired atmosphere. The light mode can be set by yourself as the default colour or to follow the code rate change, and the colour will also change at different operating modes, and can be turned off in the settings if you don't like the change. The M17 has a larger and more recognisable light area, so I keep it on all the time, and when the screen is rested and stopped, the light is turned off, so it doesn't waste power. Without the screen on, it's very intuitive to see what's going on with the player, which I find both aesthetically pleasing and practical, and if there's one thing I'd like, it would be more personalised if I could adjust the RGB colour scheme myself, like the dazzling colours on my PC.
On the front is a 5.99" 1080p display and on the top are the four headphone jacks (6.35/4.4/3.5/2.5) and the volume knob (potentiometer, which cannot be turned 360 degrees). On the left are up and down tunes, play pause and customise, on the right is the switch and volume up and down. Above the ambient light is a switch on the left and right, on the left is HOLD lock (lock range can be set in settings) and on the right is a battery/DC toggle switch. At the bottom are two USB ports, one for charging +3.0 and one for HOST (which can output 5V2A) for external hard drives, not impossible to use as a rechargeable battery; on the left is the DC port and on the right is the coaxial port. In order to prevent dust from getting into the ports that are not often used and to keep the whole machine simple, Fei Ao has three aluminium dust plugs for the 6.35, DC power and coaxial ports.
The M17 does not have as many volume adjustments as the M11PLUS, but it is more retro. The knob on the top (with the same ADC control as the M15) and the buttons on the right can be adjusted in one of two ways (both offer 120 levels of volume adjustment). If the system volume doesn't match the knob, it's easier to turn the volume knob to the minimum and adjust it again.
The leather case, which is a standard accessory, does not fit snugly on the M17, but has a clear space on the side.
Android is a traditional strength of Fei Ao, and its smoothness is very well optimised. The operation of the phone varies from person to person, but it will definitely not be as good as the original M15/M11PLUS. Since the keys are more on the upper side and there is no obvious difference between the keys and the leather case (the bare play button has a recognition point), it is possible to operate it in the left area by mistake.
Circuit design
The M17's circuit board is highly modular, which I personally think is a great example of player refinement these days. The digital and audio boards are independent, somewhat like a motherboard with a good frame, and the individual modules are then mounted on the motherboard with a high degree of functional differentiation and thermal and shielding considerations. This is coupled with a sunken gold circuit board process to ensure basic electrical performance, a white copper shield to prevent internal radiation interference and, for the first time in a player, a VC liquid cooling homogeniser to ensure heat dissipation, ensuring performance from all angles.
On the front of the system board is the core board (Snapdragon 660, 4G memory, 64G RAM and power supply chip) and the Bluetooth communication board (QCC5124). On the back is the XMOS (XUF208) interface and the DSP module consisting of the FPGA plus two femtosecond crystal oscillators. The system board integrates the parts for digital processing and the reading and receiving side of the data are also on the system board, unifying the clock management for the data sources, this integration is necessary from a shielding point of view.
The audio version is mainly a power supply circuit, with a super power supply capacitor on the front and an LDO on the back to provide a stable power supply, two DAC modules and two earphone modules (the same as the K9Pro), each shielded by a shield. The four headphone ports are positioned parallel to each other in order to round the centre of the two, with brackets added to the audio version. This is the largest and most complex on-the-go audio circuit ever designed by Feiyao, and there is a lot to be said for it.
With large-scale circuitry, large-scale heat dissipation has to be considered. This is why the design of the M17 is very clear. The VC liquid cooling plate is used to avoid concentrating the heat at one point, and the metal thermal conductor is used to isolate the battery and the circuit board to prevent thermal radiation, and then the heat is exported to the aluminum frame. This allows the air from the fan to be directed to the side and then exhausted for efficient heat dissipation.
After looking at the entire M17 board, I was personally reminded of what JEFF from Rivera said: "To achieve high performance, you must have a complex structure, don't believe in multiple incense burners and multiple ghosts, and don't believe in the fairy tale that simplicity reigns supreme, to achieve high performance, you must achieve enough complexity, that's how the world works, it must be costly enough to go further." This level of complexity as I understand it is either software complexity or hardware complexity, circuit complexity is not an end in itself, it is because the purpose of good sound makes the circuit complex, although complexity in both hardware and software is an ideal, the M17 has arguably no equal in the on-the-go realm of complexity.
System Module
The SOC of the M17 is a Qualcomm Snapdragon 660 plus 4G memory. The 660's balance of power consumption and performance is a generational benchmark, and although it is a flagship configuration from a few years ago, it is still smooth enough to put on a non-heavy use scenario like a player today, and this has been verified on numerous models including Feio's own M11PLUS. Of course, if it is to match the M17's $10,000 class, I personally think that a configuration of 6G RAM plus 128 storage would be more appropriate. But the tweet says that this didn't happen due to supply chain considerations, which I have to say is a shame. However, Fei Ao provides two USB TYPEC ports, the one on the right is a HOST port that can be connected to a hard drive, which greatly expands the storage on the body, and with DLNA reading support, there are more sources of data to read.
The system is Android 10, which I think is much better than Android 11 (11 doesn't allow access to system DATA files which is a real toss-up) and will be more compatible with new applications, such as APPLE MUSIC. the added gyroscope enables the screen to rotate at will and the selection of working modes is more intuitive and convenient, in Bluetooth reception, USB DAC, coaxial decoding, Ariplay and pure audio mode, and Android mode for quick switching, and the large screen allows for more display elements.
I personally chose the default skin for the FiiO MUSIC application and found in use that the large cover skin is more suitable for wide screens like 16:9 and not so good for narrow screens. I wonder if FiiO will optimise it for narrow 18:9 screens like the M17.
Power supply module
The M17 is probably the most complex device in the player in terms of power supply, involving two power supply methods and two supply voltages: in low/medium/high gain and in large ear mode, the power supply to the ear circuit is 8V; in super large ear mode, the power supply to the ear circuit is 11.5V, which is the voltage level of a desktop. Of course, reaching the voltage level of a desktop machine is nothing, but there is also a corresponding processing circuit, in which the key is how to maintain the power and stability between the various modules, which is also the purpose of the modular design. The dac module uses an advanced low dropout linear regulator (LDO) like the LT3045 in order to meet the high DC power requirements of the 9038. In the earphone section, AC power supply is required, and two different types of LDOs are used to secure the positive side of the SGM2211 and the negative side of the SGM2209. In terms of power supply it should be said that every effort is made to provide low noise power to all modules.
Sound module
The audio board of the M17 is the largest board in the machine, the digital signal is then transmitted to the audio board for digital to analogue conversion and amplification after being received by the digital version and processed by the DSP of the FPGA. 9038PRO decoding module (universal module, you should see this decoding module on the K9 soon, eight channels in parallel to process one channel) is decoded and then used to OPA927 (custom made by Fei Ao) After decoding, the I/V conversion is performed with the OPA927 (a chip on the module is left empty for the K9 because it is not used on the go), to the OPA2211 for LPF, and finally to the THX AAA 788+ headphone module for amplification and output.
If there is one thing that makes the M17 a dream come true, it is the fact that it uses the same decoder module and ear amplifier module as the K9 Pro, especially the ear amplifier module, which is the same model as the K9 Pro. The THX AAA amplifier circuit is optimised by the manufacturer himself. 5 % precision resistors and 5 % precision capacitors as well as opa1602 and TPA6120 make up this feed-forward amplifier module. This is a high power output circuit with very low distortion. The output power of the 788+ is twice as high as in the original circuit, and on the M17 it can produce 500mw even with a 300 ohm impedance. This circuit is very popular abroad and is most used in China. The use of an amplifier module must also give sufficient support. In addition to the power supply support, the audio version has 12 aluminium capacitors (looking like the same model as the K9Pro) on the back for filtering and energy storage, providing even better dynamics for the ear amplifier. If taken on its own, the Audio Edition of the M17 is a scaled-down desktop decoder all-in-one built with precision original components.
In navigating the circuitry, my personal feeling is that the sound is not about how one or two complementary originals can be, it is a combination of algorithms, clocks, power supply, chips, resistors and capacitors, each of which is handled well before the whole can be good. It is also in the joint action of the power supply and the module that the maximum 3000mw power output of the whole machine is achieved.
Here a word about gain, this is to say the signal amplification, for example, medium gain 0DB is no amplification, low gain -6DB is amplification 0.5 times, and super loudspeaker +16DB is amplification 6.3 times, this decibel (DB) and amplification is logarithmic relationship. 16DB gain in the table machine is not big say small say not small, from the actual sense of listening, super loudspeaker mode is not I don't think it's a good idea to set the gain at a later date.
Subjective listening experience
The most impressive thing about the M17 during listening is the ease with which it can be listened to. This ease comes from the huge power reserves and the wealth of information available. Based on the good power supply, the background of the M17 is very, very clean and there is no bottom noise at very low volumes. The large soundstage created by the ample drive has a quiet sound background that forms the basic sound framework of the M17. In terms of sound the M17 focuses on sound reproduction, is relatively neutral and has a very good sound density. The low frequencies have a very good reproduction, the dive, spread, positioning and decay of the low frequencies are all very well reproduced, the volume is moderate and there is no excessive low frequency to steal the show more restrained. There is a good density in the midrange, with vocals and instrumental conjunctions centred in the middle, with a good sense of layering and resolution, the presentation of detail in the restoration without making people feel uncomfortably over-informed, with noticeable dentition on some pairings and songs, and a slight warm staining in the midrange to some extent. The high frequency response is very good, with an airiness rarely found on the go, and the extended decay and contrast between light and dark in the high frequencies are well presented, especially the decay, which is very natural in its excess, although if one is used to listening to a type of midrange with concentrated energy, one might find the M17 a little energetic and strongly linear in the mid and high frequencies.
In Super Loud Ear mode, because the power reserve is further enhanced, when the switch is toggled to DC and the screen shows a prompt to point down to yes, there will be a very obvious feeling of the sound field expanding sound pressure becoming stronger, at this time the sound will have a sense of scale expansion while the basic frame remains unchanged, and it is easy to go back after listening to this mode.
In terms of adaptation to music, the advantages of a strong resolution and large soundstage restoration style front end comes through, which can play back various types of music very well. Without opening the playback gain (default setting, which can be opened), the initial playback loudness of various types of tracks can be felt very clearly, such as recent Internet hits and ACG music, which all have a very high loudness, and suddenly switch to old RTHK or classical music, you will find that the sound is much lower. The M17's sensitivity to playback loudness is partly a reflection of the M17's fidelity to playback, and its grasp of microdynamics and vocal detail allows for excellent reproduction of both acoustic and classical sounds, while the density of the midrange also allows for good overall reproduction of popular sounds, without the sound being fragmented due to high separation. The gaps between the various recordings can be clearly heard in the layers between vocals and harmonies and the differences in the position of the recorded vocals. This faithful reproduction leaves plenty of room for the headphones at the back end to shine, and it's up to the headphones to decide whether they want to reproduce or colour.
Since it is claimed to be a desktop machine, it is inevitable that a comparison with a desktop machine is needed to say the least. If compared to the K9Pro, the M17 in line power mode will seem to have less dive in the low end and a slightly smaller soundstage, but the midrange density will be better and the high frequencies more extended. JAMES replied on Weibo that there was 90% strength, and I personally don't think it's unwarranted.
Use with share
The first collocation is the first line power, if you have the need to drive large ears or seek better results, please use the linear power supply to replace the DC adapter that comes with it. Even after the M17's internal processing, there is still high-frequency noise, which is reflected in the lack of quiet background and noisy high frequencies. I personally think it's worth it to invest in an extra linear power supply to get a better experience.
I've paired it with a few headphones myself to try out the performance under different headphones, the rest is rather long, just pick what interests you.
FH5S
The FH5S is driven by the M17 and focuses on the low and midrange, with vocals slightly behind and the background more muddled, but with a better overall sound, fast low frequency and shallow dive. Under the powerful resolution bombardment of the M17, the lack of quality of the FH5S comes to the fore, this is to try, the average person is not expected to match so.
FA9
With the FA9 I only turned on switch 1 (anti-group switch), the dynamic iron resolution and low frequency dive depth of the advantages of the full play, high density of the midrange, high density of vocals at the same time the sound field is also a large circle, performance is very good, high frequency switch is not turned on, the performance of the decay is very fast, the overall is suitable for the popular style.
FD5
The M17 is on fire, and even though I have added a large triad, I feel that the price/performance ratio is high, and the overall performance is as high as a high quality dynamic coil should be. The soundstage is slightly small and the sound is slightly cramped. The slightly brighter high frequencies are well resolved, but some people may find them too bright. Overall, there is no downside to listening to pop.
FDX
With the high power reserve of the M17, this is the level at which the FDX performs at full power, instead of using the loudspeaker mode to push it, it is better to use the low and medium gain to match, so that the sound will be less impactful and more listenable. The high frequencies are better controlled, but the low frequencies are still slightly underdeveloped. Personally, I don't think it's designed to be portable enough, so I'll have to hear it for myself to judge.
ToneTeam evo
Special note, this headset frequency response only to 16k, with the M17 can be said to show its qualities completely, EVO positioning is very good, the sound field is open, the low frequency is relatively weak, the midrange is extremely dense, can be said to be the human voice of the original are the slightest to show you, due to frequency limitations of high frequency dry, lack of vividness. It is also possible that I did not wear it properly, and that the tooth sound was slightly heavy.
EM5
The EM5 is the most commonly used flathead plug for me, I use it when I work, and the EM5 is driven by the M17 to improve the resolution of high frequencies while maintaining the advantages of low frequencies.
Khan
Khan is a slow, slightly irritating headphone with high frequencies and a midrange that is far more suited to acoustic sounds. On the M17 the drive is adequate and the characteristics of the headphones are reflected very well, especially the acoustic performance is particularly suitable for showing the kind of big scene tracks. Rather unexpectedly in super-ear mode, Khan's midrange is driven very full, there is a kind of HD800S drive fully midrange is filled, but all need to be wired electricity, I think this is a little unreliable, only to show that this plug has a lot of drive potential.
Polaris
Polaris is also considered high-end headphones, high-frequency performance is relatively poor, the midrange performance is particularly good, high resolution while listening to not tired, low-frequency reverb is very heavy, but also more difficult to push. In the M17 on the sound is pulled apart, the midrange density is still good, the low frequency cohesion some, is a special character of the headset.
VE8
VE8 slow, focused midrange energy, low frequency in the moving iron texture is good, the M17 is the VE8 midrange rhythm played very well, with a very recognizable sound experience, in listening to the vocals have their own unique performance, but I midrange a little muddled, the M17 driver to this quality of the original play out, giving the VE8 a good quality support.
VX
The soundstage with the M17 is not large (compared to other front ends), but the resolution is extremely well placed, the low-frequency dive and high-frequency extension are excellent, the overall sound is full, the density is extremely high, the sound has excellent reproduction, there is a kind of pure beauty without staining, in terms of sound performance I think it is considered the benchmark of moving iron.
IE800S
Now it's supposed to be Mrs Bull because of the IE900 (laughs), which is actually still one of my favourite moving coil headphones. With the M17, the soundstage has a great improvement, the natural strength of the low end is brought into play, there is a good ambient presentation of acoustic and symphonic sounds, the high frequencies still decay quickly, but the midrange is complemented by the M17 and overall becomes a bit more well-rounded.
The Sage's Stone
This headset low frequency dive is very good not spread, the overall sound of thin, sound field scale is good nearly round type, basically considered balanced, the midrange is a little bit of paste, the junction image forward, listening to the pop will obviously feel the female voice sweet, male thin, personal feeling is a very characteristic headset, good or not depends on personal judgment.
M5
With the M17's I think they can all be described as flawless across the board, a good illustration of what flagship level is. It can also render well for original sound like Star Trek which requires both large and micro dynamics at the same time, and the overall performance is good for big ears. In this pairing, the front end takes full advantage of the headphones and the headphones show the support of the front end, which I think is a very good pairing. the M5 potential in DC-powered Super Loud Ear mode can go one level further, the soundstage is further expanded, the sound is fuller, the details are more three-dimensional, and the performance is very strong, that is, the sense of line is stronger, it depends on personal preference.
I don't have the desire to turn on the big headphones, and since there is a much better Super Loud mode, I listen to them all in Super Loud mode, and I think the sound performance in this mode basically depends on the performance level of each person's own console. So I'm just saying what I feel for reference only, and by the way, the M17 is also the only player I've had so far that uses two MSB decoders as shock absorbers (laughs).
HD600
To be fair, the M17 has driven the HD600 to a more than adequate level, the sound is full of detail and has the level of a desktop driver. The low frequencies are powerful, the high frequencies are not irritating, and the midrange is not empty. The sound and flavour of the HD600 is very well balanced and slightly muddled, which is a rare thing. However, the overall sound is a bit small compared to the shock-absorbing version of the set underneath.
HD598
I should say that the M17 saved my 598, which was eating dust. The 598 was driven by the M17, and I personally think that it was fully driven, with a full and powerful sound, and the sound was not as mushy and soft as a computer pushing it directly. In my personal opinion, the HD598 is a low resistance ear of this level, and with the M17's driving power there is still plenty of room for it.
701
This is a very complete sound, the midrange performance is very good, the low frequency is also more powerful, the sound is thicker than the 600, playing the advantages of the 701's own midrange, the junction is clear, the singer's mouth can be very clearly rendered, the drive is more adequate, the overall sense is very good
HD700
I personally think that the drive very good headphones, if there is no other high-end system to compare, I think the M17 to drive the HD700 very fully, the HD700 strengths and weaknesses are shown. Yes, a good front end should be able to showcase the strengths of the headphones while also having room to bring out the weaknesses. In the performance of the HD700, the larger soundstage, the magnificent and detailed rendering of the high frequencies, the layering and positioning of the low frequencies, the fullness and emotion of the midrange all have a very good degree of reproduction, of course, the characteristics of the HD700's susceptibility to droning are also shown, giving me the personal feeling that there is a very high degree of completion of the pairing.
HD800S
This time with the recent batch of HD800S 75th Anniversary Edition, this headset and the recent batch of HD800S is the same, the sound compared to the early HD800S, the sound field is slightly smaller but the midrange image is also relatively close to the front, overall I think it is more finished HD800S. to the flagship big headset, M17 driver still has highlights, first of all, the sound is not false, there is enough sound pressure level, followed by enough density, the overall sound is not empty, low frequency has a sense of power, high frequency by energy. But relative to their own desktop system, the soundstage and resolution is still a gap, but this gap to take into account the huge difference in price, I personally feel very satisfied.
Golden Crow
I purposely tried the Golden Crow under single-ended, the high frequencies were unsurprisingly out of control, but in balance the Golden Crow was still driven in a decent way. The sound was still on the thin side though, with the midrange showing a little more pronounced. The high frequencies were well controlled overall, and personally I think it was a good performance to have them under control. For the same reasons as above, I am personally satisfied with the result of this driver, but the shortcomings also show that the M17 is still not as good for driving headphones with high current requirements.
HEK V2
Another headphone that eats current and with a large diaphragm, the HEK V2's low end didn't push out, there was no dive and the soundstage was rather cramped, giving the impression that it wasn't driven adequately. This is to be expected, used to listening to the sound of desktop systems, suddenly switched to a small desktop machine will not adapt to, not to mention the M17, so I said at the beginning, the degree of drive is to be judged by their own listening experience.
It gives the earbuds a high-level driving environment and a quality base, and also performs well in DC mode for driving large ears, which is an advantage of the THX 788+'s low output resistance, wide resistance adaptation and high power output.
A portable size with a sound performance that is as good as a desktop player, good adaptability to different resistance headphones and ease of use is what I like. The sound is the essence of a player, and the quality provided by the desk-level decoder module and the output provided by the headphone module create a good sound, and this is where my dream comes true.
Usage scenario sharing
The biggest advantage of the M17 is its mobility. It is especially suitable for people who demand sound and cannot sit down and enjoy it quietly. For example, I'm always travelling and I have to watch the kids at home, so it's hard to find time to sit in the study and listen to a desktop system. The M17 has an external cooling and power supply component, so you can take it with you when you're out and about, use the LO to listen to the car when you're stuck in traffic, connect it to the switchable power supply to listen to the HD598 on your lunch break at work, or plug the cable into the living room or bedroom to listen to the HD700 on the cooling dock when you get home, which is still very comfortable. After all, the M17 is much more mobile than desktop systems, which can cost several kilograms.
In addition to driving the headphones, the M17 has several other modes of operation and uses. In addition to the Android mode can use other software, pure sound mode can focus on music accidentally, USB DAC can NAIVE support to DSD512, Airplay and Bluetooth reception mode can receive audio transmitted by mobile phones, coaxial decoding mode can be connected to CD and or digital playback to expand the operation. Because of the existence of the RCA standard coaxial port at the bottom, the M17 says goodbye to coaxial adapter cables, the standard interface has a more stable connection with a very strong practicality.
The M17, like the M11PLUS, has both single-ended and balanced dual LOs. The single-ended output voltage of 1.9V provides excellent low frequency and detail for use in the car, and is superior to the car's own audio source across the board. The balanced LO output voltage is 3.9V, which is basically the balanced output voltage of a standard desktop machine. When I connected the headphones, I could get very high loudness and sound pressure with low gain (I was left in tears with only 1.97V desktop decoding), and the phrase voltage is quality on a normal desktop machine is clearly reflected in the M17, which is no less informative and clear than the output of the K9Pro. It's well worth saying that the addition of line power (plugging in line power to dial on and off to DC) improves the quality of the LO output considerably, with more cohesive and powerful low frequencies, clearer and cleaner high frequencies, more tranquil backgrounds and a better sense of midrange layering, an all-round improvement.
From the headphone driver to the coaxial output to the LO output, from my personal experience, in the mode of wiring electricity, I can approximate that the M17 is a digital broadcast decoding ear amplifier all-in-one machine.
In these use scenarios, I usually use more is Bluetooth reception, because the newly added Atpx adaptive protocol support, making the sound basically and the native playback difference is not much, play the music in the phone is also very convenient, also lazy WIFI transfer songs. I personally highly recommend the coaxial decoding mode. With the CD player playing M17 decoding (the coaxial cable is too thick to put in the stand), the sound of the Golden Woo has a thickness and the background stability has been further improved, which is a very worthwhile experience.
I personally prefer to decode the M17 coaxially and listen to it remotely using the FiiO link, as the M17's coaxial output level is not inferior to that of a professional digital player, and it is also more convenient to use.
At $12,000, the M17 is the first player to break the $10,000 barrier and comes with a front and rear protective film, leather case, cooling dock and DC switching power supply as standard to support its portable desktop positioning as an add-on module. With a price tag of at least €2,500 on the Internet, and a price tag of €13,000 for me, it's clear that Fei Ao has managed to be more affordable than it could have been. Unfortunately, it is after all a flagship product and a new model and usage scenario that will inevitably not belong to most people.
Despite having a 9200mA battery, the actual usage life is relatively short, roughly less than 8 hours on balance. Personally, I tend to favour it for audiophile users with low requirements for size of use and the pursuit of sound quality, after all, this size and range is unacceptable for some people. For those who are hesitant about the above two issues, please make sure to experience it for yourself and see if it meets your needs, after all, what suits you is the best.
But for me, the M17 fits almost everything I need in a portable device: high quality digital output, high quality Bluetooth reception, strong native playback quality and an almost desktop-like DC mode with an external expansion module. I've thought of a few other titles while writing this share, but I'm sticking with this one for now because the M17 is a dream come true for me personally.
