When it comes to OPPO, the first reaction of domestic users is believed to be mobile phones. Of course, OPP O's Blu ray machine is not a fuel efficient light. The OPPO product we introduce to you today is different from the past. It is the first OPPO flat diaphragm earphone (commonly referred to as flat earphone by enthusiasts) PM-1 and its supporting all-in-one machine HA-1. Although it is the first time to enter the field of high-end headphones, PM-1 has won the HIFI Award of EISA 2014-2015 for its excellent sound quality. How about its actual experience?
preface
When it comes to plane diaphragm earphones, enthusiasts are familiar with the Audeze LCD series in the United States, the HIFIMAN HE series in China and the "Tuhao" ABYSS in the United States. PM-1 also uses plane diaphragm technology, and adds many unique technologies to enhance its sound quality and adaptability. The plane diaphragm is not a new technology, it has appeared as early as the 1970s. Compared with dynamic earphones, it has its own technical advantages and characteristics. Flat diaphragm earphones have faster sound playback speed, better dynamic performance and better detail performance.
After years of research and development, OPPO has adopted a technology called "spiral pressurization" to make the plane diaphragm technology smaller and easier to push. On PM-1, OPPO uses the spiral pressurized plane diaphragm technology composed of unique technologies such as "symmetrical double ring high magnetic energy level FEM optimized magnetic field design, double-sided spiral voice coil, unique 7-layer diaphragm"
Appearance and overview
OPPO PM-1 has an almost luxurious package. A large cardboard box contains a wooden box with mirror finish
The interior of the wooden box is grey suede, and the details of the buckle and the opening/closing shaft of the wooden box can feel the style of the factory everywhere. In terms of the luxury level of packaging, OPPO has almost no rivals, and it has an overwhelming advantage over earphones priced at 10000 yuan.
The workmanship of the earphones themselves is also quite excellent. The workmanship is very high. The workmanship is exquisite and exquisite, giving a very pleasing feeling. The whole headset is made of black leather and metallic silver, which combines the sense of retro and technology. The bare headphone is 395g, which has certain advantages over other flat earphones. The weight of the Audeze LCD series is always 600g, which is daunting.
The overall framework of PM-1 is made of aluminum alloy, which can improve the durability to a certain extent.
The riveting process at the head beam connection is also excellent, and the twisting feel is smooth
The main body of the earphone is surrounded by a metal framework with sandblasting process
Part of the metal behind the head beam cortex is designed with a bright surface, which is easy to get fingerprints and scratches. PM-1 can also adjust the size of the headset
Soft sheepskin material is used in the earmuff and headband of the headset, which is comfortable to handle and wear
PM-1 adopts open design
Earmuffs can be removed
Close up of plane diaphragm element
It also comes with dense velvet earmuffs and 3.5mm single ended oxygen free copper headphone cable
A single crystal oxygen free copper headphone cable with 6.35mm interface is attached, which is much more "burly" than the one with 3.5mm interface, while the 4-pin XLR balance port requires additional options
Two level 2.5mm interface is used at the headphone connection
A denim zip storage bag is included in the package
Twist the headphone unit into the storage bag
Finally, let's look at the parameters of PM-1:
Impedance: 32 Ω @ 1KHz
Sensitivity: 102dB/1mW
Wire material: 3m OCC wire (single crystal oxygen free copper, 6.35mm interface), 1m OFC wire (oxygen free copper, 3.5mm interface)
Unit type: plane diaphragm
Size: 85 x 69 mm
Frequency response range: 10 – 50000 Hz
Price of BOC: 8799 yuan
In terms of parameters, OPPO has achieved a sensitivity of 32 Ω and 102dB through its self-developed unit, which is very difficult for flat earphones. It is also the most sensitive flat earphone. From the actual audition, PM-1 is really easy to promote.
After watching PM-1, let's take a look at the decoding, preamplifier and ear amplifier HA-1 from OPPO. As a partner of PM-1, it also has many highlights. First of all, HA-1 is an all-in-one machine that uses high-performance DAC - ESS9018, combined with Class A amplifier circuit, customized HIFI ring transformer, internal full balance circuit and other elements, and the material is more sincere. In terms of appearance, HA-1 is also excellent, and the sleeve brushed aluminum alloy shell also makes it look particularly textured.
There is a 4.3 inch color TFT display screen on the front, which will display various parameters of HA-1, and can provide the display of spectrum meter and level meter. There is a power switch, input mode selection knob, 6.35mm headphone output interface, 4pin balanced output headphone interface on the left side of HA-1,
On the right is the volume knob, which supports volume adjustment from - 80dB to 6dB. There is a standard USB interface below to link iOS devices. HA-1 is equipped with a remote control. When the remote control controls the volume, the volume knob will also rotate. After the gain is adjusted, the volume will automatically reduce to an appropriate level. This design is very user-friendly.
In order to help the body heat dissipation, HA-1 is equipped with heat dissipation holes at the top and bottom
There are very rich output input and output interfaces behind HA-1, including USB, coaxial AES、 Optical fiber, output interface includes balanced XLR front output and RCA front output, especially suitable for users with speakers and headphones at the same time. Of course, HA-1 can also be used as a DAC or a separate ear amplifier, which is quite versatile.
The HA-1 is equipped with a metal remote control that supports some basic player adjustments. The lower round button can adjust the input source.
In addition to supporting the Bluetooth of HA-1 as the audio source, you can also use your mobile phone for Bluetooth remote control. Install the app of HA-1 Control, that is, you can use your mobile phone to remotely control HA-1. The function of mobile phone remote control is exactly the same as that of a physical remote control.
HA-1 basic parameters:
Size: 254 * 80 * 333mm
Weight: 5.9kg
Power: 70W, standby 0.5W
Recommended headphone impedance: 32 Ω~600 Ω
Price of BOC: 9799 yuan
Sound performance
In terms of design, workmanship and materials, the PM-1 and HA-1 suits are impressive. How about their combined sound performance?
Test environment:
Hearing equipment: PM-1+HA-1
Reference equipment: Oubo Don Cuzzio Don Juan, Audize LCD-3, AKG Q701, Mini Audio DX100, Aune M1, etc
Audio input: PC USB input, ASIO driver installed
Types of audition tracks: mainly popular vocals and acg, supplemented by musical instruments, movie soundtrack, etc.
Audio format: FLAC、WAV， A small amount of DSD audio (ES9018 still decodes PCM when playing DSD)
Both PM-1 and HA-1 should be in the state after being warmed up for more than 100 hours.
From the perspective of sound style, PM-1 is a balanced and smooth headset, which is a more natural sound. The sound of plane diaphragm earphones is easy to achieve a sense of relaxation, which is also their advantage over dynamic earphones, and PM-1 carries forward this advantage well. However, there is still a gap between PM-1 and some high-end flat earphones when it comes to the sense of looseness. From the perspective of sound detail and sound detail, PM-1 has done a very good job, and its analytical power is commendable. With the cooperation of HA-1, the sound background of PM-1 is thicker, and the energy of each frequency band has a good display. The PM-1 is also an earphone with obvious sound pollution, but it will not feel tired after listening for a long time, and its style will not be biased.
High frequency: The high frequency under the combination of PM-1 and HA-1 is smooth and natural, with excellent high frequency extension and quality. Although PM-1 is not clear and high resolution driven by HA-1, high-frequency details are still well preserved.
Intermediate frequency: This set of combination sound is neutral. The intermediate frequency thickness is not thick, which can be called just right. The advantage is that the sound lines are very detailed. In terms of voice, the distance is moderate, and it is appropriate to listen to both male and female voices. However, for users who like the human voice very close to their ears, the intermediate frequency of PM-1 may feel that the sense of encirclement is not strong enough.
Low frequency: Compared with the performance of medium and high frequency, the low frequency of PM-1 is a slightly weak link, and the strength and dynamics of low frequency are not strong enough. Of course, the strong low-frequency is not what every user likes. Although the PM-1 is not a type of strong low-frequency, it performs well in details and playback speed.
From the sound perception of PM-1, it can be said that it is beyond our expectations. After all, this is only the first step OPPO has taken in the HiFi headset market. In terms of sound quality, tri frequency balance and sound field breadth, PM-1 has many highlights when paired with HA-1.
Matching and others
Although the main character of our audition this time is the PM-1 earphone, HA-1, as a special partner, is also a distinctive all-in-one machine. In terms of functions, HA-1 is quite rich. Compared with general all-in-one products, it has more USB inputs from Bluetooth and mobile devices (iOS devices only), and also has a remote control. It can be seen that OPPO has almost integrated the idea of building a Blu ray machine into HA-1, which has enough functions to shame competitors. HA-1 also shows strong thrust. Under the condition of high gain- The LCD-3 can be pushed to a higher level by about 25dB. It is believed that the performance will be amazing with all kinds of flat earphones.
HA-1 is matched with LCD-3 (four needle balance line) for audition.
Both the Bluetooth (aptX) connection and the USB input of iOS devices can support up to 48kHz 16bit files. However, compared with other connection methods, these two input methods show problems of low frequency dispersion and low sound separation. Therefore, users who want to pursue sound quality are advised to choose other audio input methods.
We also try to use the walkman's coaxial output interface to connect HA-1 for playback, and the effect is also good. Of course, we seldom use this connection in general.
As for the matching of earphones, PM-1 is a relatively "easy to make sound" earphone in terms of parameters and in fact. Even if it is placed on a walkman or even a mobile phone with enough sound pressure, it is recommended to cooperate with a desktop player if you want to give full play to its strength and due quality. You can even consider purchasing some other earphones with sufficient thrust. As for the package matching of HA-1, its multiple input and output interfaces make it have very rich functions. If users want to "go global with one machine", HA-1 is indeed a good choice. It can be used directly as a front connecting speaker and directly pushing earphone with satisfactory results. In addition, its decoding part and USB interface are relatively good enough. If you upgrade on this basis, you can consider adding a balanced earphone to form a fully balanced headphone system, which will make the sound even better.
summary
In terms of product workmanship, sound quality and comfortable listening sense, PM-1 is worthy of its high price. Users who like loose and balanced earphones can buy them with confidence. In terms of matching, they can choose neutral or low-frequency front end for use. For the combination of PM-1 and HA-1, we still give high praise. In terms of sound style and thrust, HA-1 can work well with PM-1. The first attempt to enter the high-end headphone market is at this level. I believe OPPO's personal audio products will be recognized by more and more users.
