[Headphone Forum] Although most people still prefer international manufacturers when they buy headphones, there are actually many quality headphones available to choose from. OPPO has a long-term accumulation of audio in the domestic market. The environment is also a good choice.
OPPO PM-3 Headphones Evaluation Appearance of high-end headphones first look. PM-3's appearance is very good, the cortex + metal is very high-end, the headset's work is good, including the extension cord are all wrapped with metal, the details of the processing is also very delicate. The earmuff part can be rotated 180 degrees, on the one hand convenient storage, on the other hand can also make the headphone better fit the curve of the head, in addition to the headphone hung on the neck, this rotation design can put the earmuffs The part of the neck is attached to the neck so that the clavicle does not feel too uncomfortable.
Supports multiple usage scenarios, and also provides multiple wiring for these multiple usage scenarios. It can be used to connect mobile phones, PCs, and professional audio output devices. When the headset is connected, you can use the remote control to control the start and pause of music playback. It is still relatively comfortable to wear. The earmuffs are large enough to cover the entire ear. The soft gasket reduces the pressure felt by the metal headphones. However, after all, the body's weight is not light, the head part of the long-wear or a sense of oppression.
OPPO PM series earphones is the abbreviation for Planar Magnetic, which is the flat-diaphragm earphone that the fever ring says. The PM-3 is one of the most familiar among the OPPO flat diaphragm headset product lines. According to official data, PM-3 diaphragms are based on the high-end model PM-1 seven-layer flat diaphragm, double-sided spiral voice coil design and FEM optimized neodymium magnet system, and at the same time, lightweight products. From the data point of view, PM-3 is very good, with an impedance of 26Ω and a sensitivity of 102dB/mW.
OPPO launched a new amp product HA-2 in the same period to better release the power of flat-panel headphones. The listening part of the PM-3 is basically driven by the HA-2, using the Sony PHA-1A amp as a reference.
The OPPO HA-2 has a slim, external leather finish and is equipped with high-end chips. According to official data, the HA-2 is equipped with Texas Instruments' TPA6120 and ESS9018DACs. It has a built-in 3000mAh lithium battery. It lasts about 13 hours for analog connection and about 7 hours for digital connection. Combined with VOOC flash charging technology, it can charge for 30 minutes. To 70% of electricity, it takes 1 hour and 30 minutes. At the same time, the built-in battery can also be used as a mobile power source to charge other devices. However, when working on the built-in battery, charging other devices will cause the battery life to decrease.
The output power of HA-2 at 16Ohm is 300mW, and the output power of 32Ohm is 220mW. It can support PCM up to 32bit/384kHz, and can also decode DSD by hardware, and supports both DoPv1.1 and native modes. It is possible to support specifications other than 24bit/96khz when using USB transmission.
OPPOPM-3 and HA-2 can be regarded as the official recommended collocations. Our usage scenarios include iPod Classical, Xperia Z3, iPhone 5S and PC connection HA-2. In general, the use of HA-2 to promote PM-3's sense of hearing is very characteristic. In particular, the iPod Classical, Xperia Z3, and iPhone 5S are all directly connected to listen directly, but the PC needs to download additional drivers on the official website. The selected audio sources are mainly DSD and Hi-Res PCM audio sources.
The PM-3's midrange and high frequencies are well-balanced. The high frequency is similar to a normal head-worn dynamic earphone. It is soft, but it doesn't sound exactly the same. IF sounds relaxed, and even when using mobile phones and iPods as portable sound sources, there are delicate performances. In conjunction with the HA-2, the bass sounds soft but not chaotic. This is a characteristic of the flat diaphragm headset, but at the same time it is insufficient for diving and the sound is softer.
It is worth mentioning that HA-2 also has Bass+, which is a mode of strengthening the bass. But after opening it seemed to be a bit too fierce for the PM-3, the feeling of low frequency did not change significantly, it still appeared very soft, and at the same time some out of control. However, when the Sony PHA-1A was used to promote the PM-3, the sense of hearing was slightly different, and there was some improvement in the lack of low-frequency intensity.
In general, the PM-3 is a unique headset. Beautiful appearance, driving style and sense of hearing are very unique. In terms of price, ordinary enthusiasts are completely free from problems. The official "good friend" with HA-2 amp, exquisite shape, simple operation, is also a very good entry-level amp products.
————For more information, headset business opportunities, headset purchase, please pay attention to China Headphone Network: [/], welcome to use free trial membership, contact information
Door Lock Motor Characteristics 1. No direction: don't need to distinguish the door direction, left and right sides, both inside and outside the door, can be universal. (convenient purchase locks and reduce inventory).
2. Power: the power consumption is only equivalent to one 5 of the electric control lock, electric lock, 3 A magnetic lock power to open the door, often consumes 0.27 A. And spiritual lock unlock instantaneous current is less than 0.5 A, reduced the entrance guard, talkback host power consumption.
3. No collision: close the door without collision, reduces the choice of door closers requirements (not necessarily with 65 kg of door closers, door closers are free to choose to suit the door), to solve the building door because the door closers clash of the hydrodynamic force is too high, it is not easy to make the door more deformation, prolong the service life of the body.
4. The voice is light: close the door automatically locked, no noise, solves the noise due to electric control lock itself.
5. Life is long, life is up to 350000 times
Operating temperature range:
Mini Door Lock Motor should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at ordinary room temperature catalog specifications re based on use at ordinary room temperature (approximately20~25℃.
If a lock motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.
Storage temperature range:
lock motor should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.
Service life:
The longevity of Door Lock Motor is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.
â—Use with a load that exceeds the rated torque
â—Frequent starting
â—Momentary reversals of turning direction
â—Impact loads
â—Long-term continuous operation
â—Forced turning using the output shaft
â—Use in which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a voltage that is nonstandard as regards the rated voltage
â—Use outside the prescribed temperature or relative-humidity range,or in a special environment.
â—Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.
when it come to volume production,we're a major player as well .each month,we rurn out 600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you
Looking forward to your inquiry. Welcome to our factory.
Door Lock Motor,Mini Door Lock Motor,Door Lock Dc Motor,Door Lock Gear Motor
Shenzhen Shunchang Motor Co., LTD. , https://www.scgearmotor.com