The impedance specification is overlooked by most buyers of headphones, but it may be one of the most important. Not like something disastrous would happen in an impedance mismatch, but you can not get the optimum sound output for your music player or home amplifier from a headset with an impedance that is too high or too poor. High-impedance versions are more ideal for home use than for on-the-go use. Impedance is now a quantity of energy that plays a vital role in how well the headphones work.

Low Impedance

On your receiver and on-the-go on your smartphone, low-impedance (under 50ohm) headphones can play well at home, and that is why the vast majority of in-, on-, and over-the-ear headphones are low-impedance devices.

High Impedance

Generally, high impedance indicates an impedance of many hundred ohms to many k ohms. For corporate or industrial uses, such as public addresses, high impedance speakers are often used. In this area, the high impedance speaker is used because it has the benefit of being able to:

1) receive the audio signal sent over a longer distance from the amplifier at an appropriate level.

2) be connected along with a variety of other speakers to the amplifier

 Why can't you use high impedance on a smartphone?

There is not enough fuel for the amplifier on these machines to power the headphones.

You may logically argue that the impedances do not correlate.

Plugin and check the results with the beautifully flexible music. With the performance providing plenty of visibility, detail, and even enough oomph for the bass-heavy songs, this would be a huge difference.

Does more Impedance equal Better performance? 

Given all that’s been discussed, you may be excised for believing that headphones that require an additional amplification device would certainly sound stronger. This, though, is not real.

Another function is often fulfilled by high impedance headphones. Case in point - headphones for DJs.

The output impedance is very high when dealing with a DJ deck. To allow them to live mic tracks, DJs need to plug in headphones. If used in this case, headphones with 32 ohms will quickly be blown up. Hence, a high impedance headphone will be more at ease handling the power supplied to it while providing admirable audio efficiency.

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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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New over-ear headphones AirPods Max has been launched recently by Apple. They are costlier than both the new Xbox and PlayStation with a heavy price tag of £549.

Apple is expanding its popular AirPods list with a pair of very expensive headphones. The headphones are wireless, noise-canceling, and built-in Siri competence. According to Apple, they combine acoustic design, H1 chips, and advanced software to deliver "the ultimate personal listening experience" 

Headband, which is designed in a way that the weight is distributed evenly and pressure is reduced is described as 'breathable knit mesh' by apple. The ear cups are cushioned with memory foam, which provides comfort, and a seal to improve sound quality.

Some features of the headphone include:

1. A digital crown, a dial that allows content to be scrolled through.
2. Automatic pause when you lift one ear up
3. 20 hours of battery life
4. Device switching, so that you can take a call on an iphone while listening to music on another apple device.

These headphones are tagged with a heavy price of $549. When compared, the iPhone SE starts at $399 and the newly launched iPhone 12 is $699.

Source: BBC

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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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