World Health:Advantage:1. High-impedance headphones have high signal-to-noise ratio of the systemAny amplifier circuit has a noise floor, that is, the noise measured by the ...
Mar 01,2022 | Magical
1. High-impedance headphones have high signal-to-noise ratio of the system
Any amplifier circuit has a noise floor, that is, the noise measured by the instrument at the output end after the input end is short-circuited, basically does not change with the change of the clock position of the volume knob,noise cancelling earbuds and earphones， that is, a fixed voltage value. Therefore, according to Ohm's law, the simple result can be obtained:
High impedance: low noise power
Friends who use the on-board sound card to push low-impedance headphones can confirm that they have a deep understanding of this.
2. High-impedance headphones minimize negative effects of amplifier midpoint DC bias potential
The circuit is the main structure of the power amplifier, when the input is zero, its output is not absolutely zero. Be careful friends found that when you plug in the headphones, you will find that you will hear the electricity
The presence of this midpoint offset in the amplifier manifests itself in voltages that are often in the order of a few millivolts or even tens of millivolts. Under the action of this working voltage, the voice coil of the earphone will be slightly offset and its movement in the magnetic gap will
The initial position where the effective travel of the earphone is reduced and the distortion is increased. Under the same offset voltage, the voice coil offset of high-impedance headphones is relatively small.
3. High-impedance dynamic is good. The high-impedance version of the same series of headphones has the same number of voice coil turns, but the wire is thinner, the quality of the vibration system, that is, the inertia, is reduced, and the ability to follow weak and fast signals is increased. Here, high resistance = high grade.
4. From the perspective of amplifier distortion: the high-impedance headphone has a light load, the amplifier works relatively in a low distortion state, and the sound quality is good.
5. When there are extreme and unexpected situations such as amplifier failure, volume knob suddenly turned on, high impedance headphones have better tolerance and will not burn out.
1. High impedance headphones are difficult to drive and have low compatibility with portable devices
portable devices can use batteries with low voltage; at the same time, it is necessary to consider the battery life, and the output signal power technology of the circuit is limited. These conditions make high-resistance headphones harder to perform on these devices.
But in reality, the portable unit is a patented earbud that's almost identical to larger diaphragm headphones. High impedance is not the only factor, or even the most important factor. The difficulty of the driven development of headphones is determined by the following main factors in order:
The larger the diaphragm area, the harder it is to push;
Diaphragm area ranks first. At best, the resistance has played the role of "helping the evil".
2. The high-impedance headphones have many voice coil turns and thin wires, which bring some negative factors for students
Due to the large number of coil turns and thin wires, the inductance and distributed capacitance of the voice coil increase, which brings additional distortion to the headphone system;
Manufacturing and assembly of the earphones becomes difficult due to the thin wires, and high-resistance earphones tend to break the leads of the voice coil in humid environments.
Your ears have to work harder to produce sound when significant portions of your music are muted. Noise-canceling headphones are never used by musicians since they cause ear fatigue and leave your ears feeling more worn out than with conventional headphones.
The discomfort that ANC headphones may induce has to do with how they operate, as we previously covered. Phase inversion produces a type of suction sensation within your ear that your brain will probably mistake for a pressure difference because it cancels out the exterior sound waves.
Hearing protection equipment Because these gadgets do not offer protection against exposure to workplace noise, using them in place of hearing protection may result in permanent hearing loss. Using headphones or earbuds with noise cancellation might potentially cause distraction and put you at risk for accidents.
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