How does Impedance in headphones work?
As an electronic device, headphones have some kind of resistance, as do all electronic components. A term used to describe the resistance that is found in the driver unit of the headphones is called impedance.
The impedance of headphones typically ranges between 8 and 600 ohms, with the majority of consumer headphones having an impedance of 32 ohms. A high impedance in the devices requires more power to operate, so we need to add external amplifiers to increase the power.
Is Low Impedance better than High Impedance in headphones?
It is generally accepted that headphones with high impedance, i.e. more than 100 ohms, were manufactured in the 1990s. The circuit was made cost-effectively back then by using resistors to attenuate the output power of speakers.
Due to the high impedance of devices, mobile devices cannot drive them, so only professionals can take advantage of these headsets.
The majority of headphones sold in the market are used with mobile phones, laptops, and tablets, which require headphones of low impedance.
The headphones with very low impedance cannot produce sound very accurately, while the headphones with very high impedance require special equipment. For today’s needs, however, 32 ohms seems to be a good balance. Generally, devices sold in the commercial market have this kind of impedance. To ensure commercial mobile device usage is not too low or too high, there must be a balance.
In the case of headphones, the Sensitivity Impedance is important
The sensitivity of a headphone is determined by its volume at a certain level of power. In simple terms, it refers to how much power a headphone driver needs to start producing sound, as well as how loud it can be at a fixed standard power level.
In general, headphone sensitivity ratings are based on 1KHz specific frequency and 1mW power levels.
It is generally agreed that headphones are extremely sensitive or insensitive if their sensitivity exceeds or precedes 90dB/105dB.
Causes of distortion in headphones
Disturbances occur when the headphone is unable to handle more power than the source.
The importance of impedance matching in this situation cannot be overstated. You should match your devices’ impedance in order to avoid distortion and get the best performance out of them.
The amplifier and headphones are matched so that the amplifier’s source impedance is lower than the headphones’ load impedance.
In professional settings with amplifier output, low impedance devices should not be used.
Different frequencies of headphones
With headphones, it produces frequencies from 20Hz to 20Khz using headphones. Almost all headphones and earbuds can achieve this, with the exception of very poorly constructed headphones, which should be avoided at all costs.
When it comes to resonant frequency, another factor also plays a role. Materials vibrate easily when they are vibrating and often break as a result. Using the example of a wine glass that was broken by an opera singer as an example. The opera singer can break the glass as soon as she reaches its resonance frequency.
The behavior of headphones at their resonant frequency needs to be observed when designing headphone drivers to prevent them from behaving notoriously.