Impedance: what it is and how it affects the sound of the speakers in the headphones

For measuring the commonly used standard multimeter.

What is it - Impedance: the meaning of the characteristics from the point of view of physics

First, let's turn to the theoretical knowledge, looking into the electrical section. So, what is the impedance? This full (complex) impedance (unit - Om) in bipolar electrical circuit when the AC oscillations. The value is quite difficult to calculate, since the sum of the resistance and reactance. Also for this parameter directly influences the oscillation frequency.

In addition to the electrical impedance there are several other varieties. The most relevant in this case is the acoustic impedance. What is it? By analogy with the main subspecies, under this definition, hidden resistance of the material object various kinds of fluctuations.

And impedance characteristics parameter in acoustics

On the part of physics, we hope everything is clear. But now we are primarily interested in, which means that the impedance (resistance) in the headphones and similar portable applications. Thus, the impedance of the headphones - this is the resistance value obtained at the entrance. It denotes the symbol "Ω", The unit serves as a ohm.

This characteristic affects the specific volume (more on this later) and device dependent output power. Moreover it holds inverse relationship, as shown in the table below.

Also on the Web, you can come across the term "impedance of the speaker." Anticipating your questions about what it is to inform our readers that this definition is based on the following meaning: when playing formed the load, transforming the electrical signal into heat in dynamics, rather than in sound. It is this negative phenomenon and we kind of struggle, choosing the optimal model.

To measure the impedance of the speaker is used all the same multimeter (in electrical engineering without it - anywhere!).

What is better to choose the headphone impedance vrazlichnyh situations

Because of different players, smartphones and other audio systems use a certain power rating, you should know before you buy, how much needs to be Ohm headphones for different needs. We invite you to consider some of the most common options.

Optimal resistance of the headphones to the phone, music player or laptop

If you are going to listen to music or watch movies and TV shows using your smartphone or compact notebook, it makes no sense to take the headphones, the impedance value in which greater than 50 ohms. First, a low volume level does not allow you to fully enjoy every note of your favorite tracks. Secondly, the compact device, in some cases, will not be able to provide much higher power - you You understand what it means exceeding ohm headphones when the unit will stop operating at the most inopportune moment.

AKG K3003

What better impedance headphones suitable for stationary PCs, music systems and professional work

Unlike his colleagues, portable, larger devices with the corresponding audio amplifier have significant capabilities and performance. Concerning headphones with an impedance of less than 32 ohms in this equipment is best used with caution: Too high probability that the device clearly it shows you what it is - do not observe the rules of selection of resistance in the headphones, short circuits or other serious breakage.

But if on the packaging and in the specifications flaunts resistance at 50-60 ohms or higher - you can safely use a high-impedance device to a stereo or gaming PC.

sennheiser HD800

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How to choose the right headphones

So now you have general information on the need for selection of resistance when buying audio equipment. But this is not enough: it is also important to understand what impact the notorious Ohms headphones. Let's look at some important points that will allow you to simplify making the right decisions.

On that generally affects the resistance of the headphones

Although the most common statement that the impedance has a direct impact on the volume, it's only half true. In fact, the high or low resistance primarily affects the power of the amplifier and, as a consequence - the lack of signal distortion and increasing the volume level. Also, the impedance of an impact on energy consumption - this is especially true when using smartphones or laptops with high-impedance headphones.

At that affects sensitivity headphones

But this option is dependent on the hero of our review, and is the main indicator of the headphones volume. The fact that the sensitivity headphones - this is the volume of the sounds or music signal at a certain level, measured in dB (decibels). The minimum value is present in modern technology is 32 dB (the lower figure will be perceived by the human ear as a whisper). Maximum the same figure reaches 130 dB, but no more - it is already 140 decibels can lead to pain shock.

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Conclusion: what determines the volume of the headphones and the impedance is important

Now, it's the end of our journey the next in the world of electronics and its basic terms. Hopefully, now you know 100% what it is - the resistance (impedance) of the headphones and the like Oma affect the technical capabilities of different devices. Let's consolidate learning: on the volume primarily affects the sensitivity, but in order to achieve best results, it should be consistent with the power, which in turn depends on impedance. So look carefully at the number after «Ω» icon in the specification or on the packaging before you buy - it will facilitate the adoption of the final