I believe you have all learned The X3 uses the DAC ES9018MK2. In fact, some domestic Hi Fi portable players also use the ES9018. Today we introduce the famous "national brick" - Hifiman HM-901 from Hifiman Technology.
PS: The ES9018MK2 on the X3 is a low-voltage version of the ES9018. The hardware indicators have been reduced to a certain extent, which is more suitable for use on mobile phones.
Friends who have some knowledge of walkman players believe that they have heard of Hifiman. Their first flagship Hifiman HM-801 once dominated the high-end player market. As a new top product, the upgraded Hifiman HM-901 has made great progress in both appearance and sound quality. First, let's look at the parameters of HM-901:
Dimensions: L * W * H 117MM * 72MM * 29MM
Weight: 250g (with battery and ear amplifier card)
Endurance: about 9 hours
D/A conversion chip: ES9018 * 2
Low pass filtering: OPA2107 * 2, OPA627 * 2
Frequency response: 20HZ-20KHz
Signal noise ratio: 106 ± 4DB
SD card: up to 128G
Retail price: 5999 yuan
From the parameter point of view, the most powerful part of HM-901 is the use of two ES9018s. There are few walkman players using this top DAC, and the use of two HM-901 is unprecedented.
The package of HM-901 looks very grand, and its volume is also larger than that of a common walkman ▼
The side of the package is bright and reflective, and the bottom is marked with a model ▼
Warranty card and relevant instructions are provided in the package ▼
Attached accessories include USB data cable, coaxial output/input cable and charger ▼
HM-901 looks very masculine, and uses the combination of black and silver ▼
The brand logo on the top of the fuselage is wrapped with a layer of leather ▼
There are six buttons on the machine body, one rotary table, and the buttons feel crisp ▼
There is a volume knob on the top, which has a unique feel and clear scale ▼
The back is made of metal and engraved with some relevant information ▼
From top to bottom on the right side of the fuselage are the lock key, high and low gain, high-frequency tuning, key on and restart ▼
On the right is the balanced output and SD card slot ▼
However, some problems in quality control of HM-901 should also be pointed out here. As soon as we got started with this machine, the card slot failure occurred. Specifically, the SD card could not be inserted into the card slot ▼
There is a 3.5mm headphone connector ▼ on the top of the fuselage
There is a dock port and back cover lock at the bottom. There are not many output ports on the HM-901 fuselage, which mainly rely on the expansion ability of the dock port, which to some extent limits the expansion of the fuselage, but also makes the fuselage design more concise ▼
Different from the general "national brick", HM-901 can disassemble the battery at will. Just gently push the metal cover on the back to see the battery ▼
The battery capacity is+7.4V 1600mAh, -7.4V 520mAh ▼
After the battery is removed, we can see the ear amplifier card of HM-901. According to the different needs of users, Heineman has also customized different types of ear amplifier cards for purchase. There are also some third-party customized ear amplifier cards in the market ▼
The standard card uses a single AD8397 as the operational amplifier chip ▼
As a high-end audiophile walkman, sound quality is of course the top priority of this kind of product. The HM-901 has been favored by many audiophiles since its launch, and the editor here simply writes about the listening sense of the HM-901 (matching , low gain, HD).
First of all, in terms of the overall style of sound, HM-901 is a neutral and balanced player. In addition to the balance of tri frequency energy distribution that we often understand, HM-901 is also a player that can balance the details and flavor of sound, that is, we often say that the quality of sound and the sense of hearing are both considered. And players of the same level Compared with HM-901, its control power at high frequency is slightly better, which is a delicate and non harsh high frequency. The intermediate frequency of DX100 is slightly thinner, which is more detailed than the sound of HM-901. The human voice of HM-901 is slightly stained and softened, which is slightly inferior to DX100 in details. In terms of low frequency performance, HM-901 has slightly less low frequency than DX100, but better elasticity. In the collocation of the author, the collocation of HM-901 and NT6 Pro is not as comfortable as that of DX100, which is mainly reflected in the excessive sound burr and human dental sound. Of course, this is only a matter of equipment compatibility, and does not represent the absolute advantages and disadvantages of the two players. In general, HM-901 is a high-end walkman with mellow voice and outstanding quality. Of course, this is just a rough comparison. For the player HM-901, the sound performance will be more outstanding after a long time of cooking, and the design of the interchangeable ear amplifier card will also enhance the sound plasticity of HM-901.
In terms of thrust, this level of "National Brick" can push ordinary earplugs and earphones. The volume of HM-901 is divided into 20 levels, plus high and low gain. When the editor pushes the NT6 Pro during audition, it only needs 9 levels of volume at low gain to have enough sound pressure. However, this also brings another problem, that is, the volume span between two adjacent volume levels is a little large. It is likely that the level 9 sound is too small, and the level 10 sound is too large.
For some high-end walkman enthusiasts, HM-901 is undoubtedly a rare front-end. Its unique design, excellent quality and sense of hearing make it unique. Of course, in addition to the high price (single machine 5999, balance card 1799), the quality of the HM-901 is also a worrying problem. In addition to the SD card slot failure of the small knitting machine, many users on the Internet also reported that their machine has other quality control problems. In addition, as a flagship player, HM-901 has no built-in storage space and only allows users to store songs on the SD card. For one thing, it increases the use cost of users, and the quality of the SD card used by users is also uneven.
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