Noise cancelation headphones eliminate background noises such as a motor aircraft's whistle, a train's rumbling, and traffic noise. They achieve this by generating a sound wave "anti-noise," which interferes with and reduces undesired background noise. They have a microphone adjacent to the ear and an electrical circuit that emits the opposite sound. Contrary to smartphones, headphones with sound canceling do not release low amounts of radiation and face no conceivable dangers arising from the regular use of a mobile phone near the ear.

Loud sounds as well as excessive low noise can add to medical issues.

In complete, headset noise cancelation does not have a detrimental effect on the ears. But it can be distracting to some people and also contribute to dizziness. It is safe not to use it too much or if it is not too loud to leave Active Noise Cancelling turned off. Be careful not to harm the hissing sound.

By the way, whether you have routine conference calls or remote sessions, you can add up to the noise cancelation from your headphones. You may use sound cancellation software such as Noise Gate to ensure that the sound is eliminated on all sides of the conference call.

In reality, headphones canceling noise are good even for your wellbeing. Let's look at that, too.

What would you do to maintain your hearing?

Do not fail to keep your headphones on reasonable intensity. This is one of the biggest challenges presenting a health risk.

This is how you can detect if your headphones have moderate volume. The noise amplitude is measured in decibel ranges and up to 85 decibels is the optimal noise intensity that does not affect your ears. It starts to affect your hearing while you listen to anything above. Casual talks are around 60 decibels in a quiet spot. Try to control the volume – a casual discussion. And don't find it too intense to hold discussions either. Up to 95-100 decibels will hit loudness from both speaking groups.

Another way to assess if the amount is too noisy to listen to your own ears. Pay attention to what is going on and take your headphones. You have a pitch that is too loud whether you hear a faint ringing of the tone in your ear or if all the other tones sound dull and quiet.

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Oppo has unveiled its IoT product wireless headphones in the Nepali market along with the new smartphone A31. The company's Enco series wireless headphones have been available in the Nepali market since Monday.  The company has launched three models in the Nepali market.

   Model                  Price                Availability     

Oppo Enco W11    3990    Oppo's offline retail channel

Oppo Enco M31    4990    Online with Daraz Nepal

Oppo Enco W31    6990    Online with Daraz Nepal

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Sensitivity is how an earphone transforms an electrical signal into an acoustical signal efficiently. Sensitivity means how noisy the earphones from the source can be for a given amount. This calculation is given in Sound Pressure Level decibels per milliwatt, or dB SPL/mW. It could be seen as dB/mW in some instances and is based on a 1 mW input signal. One mW, or 0.001 Watts, is one-thousandth of a watt.

 A defined headphone's loudness is directly related to its impedance and sensitivity.

When learning about a headphone's sensitivity, since they are co-related, you can also consider the impedance.

Headphone impedance defines how much electrical resistance a headphone provides to an audio source's signal. A headphone that has an impedance ranging from 20-40 Ohms would make a fair option for a casual audience.

High-impedance headphones are less sensitive and can sound louder when used with the phones in the build amplifier. For this purpose, to drive and get better sound, higher impedance headphones would take more power.

Sensitivity Range

Earphone sensitivity is typically in the 80 to 125 dB SPL/mW range. An example is here. The sensitivity of one earphone is 122 dB SPL/mW. This means 122 dB SPL would be generated by 1 mW of electricity. This amount of SPL is above the pain threshold and can inflict lasting hearing loss within a brief period of time.

Level of Sound Intensity (SPL)

Measured in decibels (dB), it is the sound frequency that humans can detect and perceive a sound, while the human ear is not similarly receptive to sounds at the same level of sound intensity except at different frequencies (20Hz to 20kHz).

In the world of headphones, to create a high sound pressure level, most headphones won't require more than 1 milliwatt of electricity.

SPL output level

There is no linear sum of dB SPL; 2 mW in the earphone does not produce 244 dB SPL. Doubling the input power or halving it raises or reduces the SPL by 3 dB. 119 dB SPL will be produced from a .5 mW input into the earphone. A sensitivity level doesn't mean much unless it is balanced by an audio system's output capability. Using a low-sensitivity earphone will result in low SPL if a device has low-performance values. Due to amplifier clipping, increasing the amplifier frequency in this setup can lead to noisy audio.

Sensitivity Lower vs. Higher

We humans most commonly listen to a frequency of between 60 and 80dB, and 90dB for the audacious among us. Most headphones have a sensitivity level of around 100dB on average.

It ensures improved driver output without using too much power when a headphone is claimed to have higher sensitivity. Using a high sensitivity headset at high speeds, though, can also inflict harm to the drivers of the headphones and the ears. The sound may even get blurred at high levels, depending on the headset.

Headphones with low sensitivity are the opposite of headphones with high sensitivity. While they need more driving strength, these kinds of headphones are more reliable than those with greater sensitivity. This is because they do not harm the driver machine, except though supplied with more power.

In order to get better sound reproduction with lower sensitivity headphones, a high power supply system (headphone amplifier) would be needed.

So, is sensitivity an essential factor to look out for in a headphone?

Yes, it is! 

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Wired headphones are just too uncomfortable for most individuals to use on a regular basis. The only reason many individuals do use wired earphones is that they are relatively inexpensive. Wireless headphones, however, give a totally different experience that should not be missed.

Before purchasing the next pair of wireless headphones, here are some things to consider.

Efficiency of sound

Audiophiles are not the only ones who should be worried about their headphones' sound quality. It is of utmost importance to consider audio quality before committing to any single pair of wireless headphones.

Many wireless headphones these days are fitted with aptX technology.

To put it plainly, Bluetooth was never designed for audio transfers of high quality, which suggests the audio is compressed, making it sound worse.

With aptX, compression is performed differently to make the quality of audio even more comparable to CDs. However, the trick here is that the aptX technology must be assisted by both the headphones and the audio equipment (speaker or phone, for example). You should also look into sensitivity and impedance for better quality.

Shape, convenience, and size

In fact, when looking at wireless headphones, these three areas are what most individuals concentrate on, and for good reason. Many people use a single pair of headphones every day for many hours, so they have to be comfortable and convenient.

Many people would still pay a lot of attention to design, of course. As well as their sleek-looking counterparts, wireless headphones that do not look good simply do not sell.

Wireless earphones come in three forms: in-ear, on-ear, and over-ear.

In-ear may be self-explanatory, but with many companies seeking to revolutionize its shape and functionality, it is actually the single most creative field currently.

On-ear headphones are those that are actually resting but not entirely enclosing on top of the ears. In addition, the whole ear is surrounded by over-ear headphones. The distinction between the two is that, with louder volumes and stronger bass, the latter allows for better sound quality, but may not be as convenient or portable.

Pairing and Controls

If you are used to wiring headphones, then you are more likely to use physical buttons along the wire to monitor items like volume or play/pause. However, wireless headphones can be very different.

Many wireless headphones on the earpieces themselves have buttons. Some of them stand out, but instead, the most recent ones have touch controls.

By voice or by external apps, a limited number may also be managed.

The process and style of control are much more important than you would believe. Most manufacturers prefer design rather than functionality and everything depends on your specifications. Some of the controls, for example, may not be acceptable for gym-goers, while others might be ideal for that particular purpose. How the headphones can be combined with an external computer is another factor to be considered. Most just use Bluetooth to link up with an external speaker or phone, but some may also have NFC capability.

Others also integrate all technologies into one. That means you can pair them via Bluetooth or just tap on the headphones with an NFC-enabled device (such as your smartphone).

Life of the battery

The fact that wireless headphones have a restricted battery life may be an unfamiliar idea for those of you who have only ever used wired headphones. This is, however, an essential aspect of wireless headphones and something that should be considered very important. Most wireless headphones give you a decent battery life of a few hours, so you are most likely to be able to use them for quite a few hours. However, if you need an extended battery life for some reason, then you will need to do some more testing.

Charging time is another thing to remember here. If when you come back from work, you fail to plug your wireless headphones in, so the next day you will not be able to use them.

Cost

It is time to talk about costs, having gone through most of the items you should consider before making a purchase. Premium wireless headphones, as with most other items in existence, come at a premium price.

You should expect to pay quite a lot of money for the privilege if you are looking for wireless headphones with great noise cancellation, advanced features, great design, and fantastic sound quality.

But if all you are searching for is a comfortable pair of wireless headphones, a cheaper pair will do the trick just fine for some easy music listening and/or voice chat.

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