was born as a "core enthusiast" and has a deep experience with M15.

originally thought that the pricing of Feiao products would stop at the 4497 of M11 Pro, but this time he released an all in one monster model M15. Stacking is still a familiar operation for Feiao products, but the sound is not the same taste. If you think you are a "core enthusiast", you must listen to the voice of this M15.

this M15 article was originally distributed in two parts, but it was delayed due to various factors. The new video will present all the contents of M15 together this time. You can choose the chapters you are interested in to read. Unfortunately, I forgot to take the Bluetooth headset during the holiday. This time I lacked the experience of the Bluetooth headset. Next, let's not talk nonsense and go directly to the sound experience that everyone is most concerned about.

actual sound experience

Feiao's player on the new audio and video has been deeply rooted since X7, and even the two labels "untuned" and "ten thousand year turntable" have been pasted in the group of burning friends. In fact, Feiao's player started to look for changes from M11. Since Q5s and M11 Pro, the new audio and video have changed their views on Feiao's 4.4mm balanced interface. The reference here is the M11 Pro released by Feiao.

, each manufacturer has a different understanding of the "sense of atmosphere" of music, and it is normal for each user to hear feedback from his ears. In the past, Feiao products used to make sound very "plain". This is a product of several generations. Whether it is Feiao players or not, Feiao's tuning has been blacked out all over. Among the "core enthusiasts" user groups that M15 wants to base on this time, it is impossible to tune without pleasing ears, so there is a reason why M11 Pro is so hasty.

Compared with M11 Pro, the improvement of M15 lies in the output power. Listening to the same songs under the same sound pressure can feel the powerful sense of power of M15. What comes with it is rich information and sound dynamics. Needless to say, the sound field and image are not needed. All these improvements are driven by the M15 to drive the big headphones. In fact, the new audio and video will make it difficult for the M15 to try with Sony MDR-Z1R, which is recognized as a product that cannot push good sound. There is no "muddy" sound when M15 pushes MDR-Z1R. Compared with M11 Pro, M15 has smoother and more delicate sound, higher density and stronger dynamic transient. The sound of M15 is warmer than M11 Pro, and the density and thickness of intermediate frequency are improved.

In fact, the control force of M15 can be enough to eat large headphones and small earplugs with high sensitivity. I have already talked about this issue in my experience article at the press conference. The key point here is that M15 does not have the distortion of normal small earplugs with large earphones. It is estimated that the official "active servo power supply technology" has made M15 a portable model that can eat all.

M15 provides six digital filter modes and ALL TO DSD upshift function. It is quite necessary to choose different settings when listening to different songs, because these settings will directly affect the user's experience of "atmosphere" and "texture" of sound. Loved students can slowly try the difference between several filters.

Comprehensive Use Experience

on the whole, M15 has done a good job in the details of the product this time, and its workmanship is not up to the name of flagship. Even the front glass also adopts a curved shape that can be better held. The physical button on the side is a bit close to M9, and it is easy to touch it by mistake when you are not used to using HOLD to lock the fuselage. The partial damping of the volume adjustment is slightly higher, which may be to prevent "ear blowing" after the player misoperates in the bag. Pause the player to insert earplugs (the sensitivity cannot be too low) and you will hear the sound of current. It seems that the 1.00 firmware at the press conference site does not have this problem. I hope Feiao will withdraw from the new firmware for improvement.

system, the player experience of M15 is very close to M11/M11 Pro, and the 1.01 firmware has been updated to set the player mode (car/Android/pure tone) in more aspects. Pure tone mode means that only the content in Feiao Music app can be used. In pure tone mode, there are occasional small BUGs of volume adjustment. I hope Feiao can correct them in subsequent firmware updates. In the car mode, users can match the USB car isolator (used to purify the car circuit) obtained after drying the list. Currently, they have used it twice and have not encountered any BUG. WiFi is one of the advantages of Feiao player. New audio and video often use WiFi function to connect NAS at home, so listening to songs at home saves the trouble of passing songs.

7490mAh battery capacity, the battery life is naturally needless to say. M15 supports three fast charging specifications: QC/MTK PE and PD. Currently, Apple, Hammer and Huawei's PD fast charging head and Letv's legacy QC3.0 fast charging head have been tested to reach the fast charging specifications. I don't know if it is because of the good heat dissipation design of the fuselage, I can't feel the heat under fast charging. The fever of M15 appears when listening to DSD songs for a long time. The temperature is not high and it is completely acceptable for the player.

as early as in the M11 article, the new audio and video pointed out that in the future, such an open Android player will gradually lose some unique operations of the player. Generally speaking, Feiao M15 is better to use, and the products are larger and more suitable for putting in bags.

Appearance Design

For most users, the charm of the product is not stacking hardware. Apart from the hardware, the appearance design will become the first feeling of the whole product. The appearance design of M15 is not as radical as the M11 series, but a bit like Q1 MarkII. In fact, Feiao's exterior design has always been quite stylish, and there is no place to reduce costs on the M15 fuselage.

fuselage not only takes care of the hand feeling but also caters to the officially advertised Roman column design. M15 inherits M9's maloperation key constitution, but there is a HOLD key to lock the physical key. All the keys and volume adjustment knobs of Feiao are on the left, which may be a challenge to many people's usage habits. However, the new audio and video were not used to it two days before they started. The volume knob on the top of the fuselage has slightly higher damping and is difficult to operate with one hand. In fact, for such a brick, it basically bid farewell to the possibility of one-handed operation.

all earphone related connectors are on the top of the body, this design is highly praised. Concentric circle design is quite difficult, which is helpful and well received for patients with obsessive-compulsive disorder. The M15 drying list will be accompanied by a base and leather case. The leather case has a relatively large effect and is difficult to plug in for the first time. There is still room for further adjustment in the design of the volume adjustment part. The base is a very practical tool that allows M15 to instantly enter "desktop player mode", but this dock only supports 5V2A charging specifications.

Audio Architecture

Exynos 7872 has good performance and can provide good performance support for audio. The power consumption and integration of 14nm are more in line with the requirements of the player. Yes, this time I still use the familiar Samsung Exynos 7872 master. As mentioned earlier, Feiao is a manufacturer that pays attention to cost control. Rashly updating the master will only increase the cost and postpone the release of M15. Usually, many media teachers are talking about the audio architecture starting from DAC. New audio and video have always started from the main control. A complete audio processing flow starts from the main control. The early main control played the role of DSP. Now the performance of the main control chip also affects the software and other use experience of the product. For the details of this chip, you can look at the article on the new video M11.

is a top flagship product, it may not pay attention to these details, while Feiao is more real on Bluetooth. The integrated Bluetooth scheme of Exynos 7872 was abolished by Feiao in M15. This is because an independent flagship Bluetooth chip is needed to solve the contradiction in Bluetooth audio in order to achieve low latency and compatibility with more Bluetooth codecs. CSR8675 is Qualcomm's Bluetooth chip with relatively stable performance and is a chip used by the mainstream flagship Bluetooth headset. At present, it is also recognized as a reliable Qualcomm Bluetooth chip, which is also an idea of M15 as a "balanced" product.

In the digital circuit part, NDK femtosecond crystal oscillator and Feiao 3rd generation algorithm used by FPGA chip are used to further reduce jitter and keep the clock in a more accurate state. Clock is one of the most influential factors in the digital audio processing section. If you are interested, you can read the previous article of the new audio and video. USB decoding mode uses Xmos XUF208, which is a chip with high specifications and supports 768kHz/32bit and DSD512 audio input, which makes M15 possible as a powerful decoding ear. However, the M15 cannot completely replace the status of Q5s, because the design of Q5s supporting replaceable ear cards is a bright spot. Moreover, the chip positioning of M15 in the decoding part is also different from Q5s.

decoding chip uses two AK4499EQ, which should be the highest-end & Delta used by portable player devices.-& Sigma; DAC chip, the key point is that this is a current output architecture. Compared with the DAC of the previous voltage output architecture, these DAC chips package the basic DA conversion and voltage output amplifiers together, and can connect peripheral components with voltage output signals during the LSI output phase. It is precisely because it has a built-in amplifier that it has the advantage of easy access to specification characteristics. 4499 Compared with the previous output type, the current output only handles DA conversion, and the current-to-voltage output amplifier (I/V) is located outside the LSI. Since audio manufacturers using DAC chips need to design this current & rarr; The voltage output amplifier (I/V) seems to be time-consuming and has greater disadvantages, but on the contrary, from the perspective of the whole component design, the freedom of timbre design is greatly increased. This is also reflected in the audio architecture diagram of Feiao M15.

here, Feiao M15 uses four OPA1612 to form I/V conversion and OPA2211 low-pass filtering. The reason why M15 did not use the highly praised THX AAA of M11 Pro this time is very simple, that is, the output power problem. It is not to prepare for M15 Pro, but because the output power of THX AAA is smaller than M15. If THX 788 is used instead, it is impossible to make minor changes to the current M15. Feiao is a professional audio enterprise that is very good at controlling costs. After weighing the pros and cons, it uses the current OPA1622 & OPA2211 scheme.

circuits, basically all kinds of capacitors are used for better filtering and stable power supply. The 8-layer PCB design is a very stacked motherboard layer design. In addition, the shielding cover and heat dissipation design on the motherboard contribute to the stability of the player. Here is an additional point about the power supply architecture of M15. Apart from the links of rectification, voltage stabilization and filtering, the "active servo power supply technology" in the official introduction belongs to the mainstream DC-DC power supply architecture of the current player. "Active servo power supply technology" is interpreted as the power supply system changes according to the system output settings.

M15 has a very detailed hardware introduction on the official page, and the new audio and video are basically copied. Feiao has always been willing to work hard on hardware. Users who like Feiao or not must admit this. M15 is a player product with a price of nearly 10,000 yuan released by Feiao for the first time. Apart from simple stacking of materials, Feiao has seriously considered the "short board" of each product, balanced the short board of each product, and made the user's use experience highly consistent.

Some Subjective Views on M15

the high-priced music players in the past few years are all based on self-made systems, with basically zero scalability and playability, thus affecting everyone's consumption desire. This kind of situation is difficult to change the situation simply by relying on a few poisonous articles until the emergence of M11. The powerful performance and the playability of Android system make the player re-enter the eyes of some players. Although it is relatively late this time, it is finally waiting for this day for many persistent enthusiasts. M15 is not cost-effective, because the target group of this product is very clear, and the price alone can dissuade almost all passers-by powder.

new audio and video has not come into contact with an open Android player that can match M15 in hardware performance and thrust. There are more or less subjective opinions here. The selling price of nearly 10,000 yuan basically bid farewell to ordinary users and enthusiasts with insufficient budget. M15 may not be an ideal "sound quality king", nor does it bring absolutely top-notch design. It revolves around the group of "core enthusiasts" and achieves the extreme of this price in a balanced manner with all the content that has fever and expectations. You don't need an M15 in hand, any music player, Bluetooth decoding earpiece, portable decoding earpiece and other equipment. M15 can completely meet your needs.

think back to the feeling of using M15 during this period of time, it is finally found a portable player suitable for pushing headphones. In fact, there are still many places to share about M15. It is suggested that if you have the opportunity to actually experience it, you must try this product.

author:new video02-09 16:04

website: https://weibo.com/ttarticle/p/show?id=2309404470087875690667