This is the desired range, which is optimal for the amplifier. It is often believed that the louder the amplifier is the better, but it is not. If the amplifier is excessively loud, then when you lower the volume level, you often have to deal with different problems: audible background noise or channel imbalance. Для Apple iPhone 5S оптимальный диапазон регулировки громкости от максимума равен 36 дБ так как используется цифровой регулятор громкости.
Digital volume control - when the volume is lowered by program way or through the controller in the DAC, the useful signal decreases in amplitude, but the background noise remains at the same level. In smart phones, tablets and laptops in the low volume area there can be a noticeable contribution of distortions from the software algorithms of SSRC, which are even more destructive than background noise. Moreover, where volume control is performed through the OS Windows, Linux , the volume control range may not exceed 48 dB and the user will have a choice between the loud sound and its total absence.
Analogue volume control - most analogue controls have an unbalance in the low volume level, when one channel sounds quieter than the other. To obtain a better volume control, use variable resistors from ALPS. In this case, imbalance is observed at much lower volume levels. To obtain maximum quality, discrete regulators stepped volume control are used. Но, обычно шаг регулировки в области низких громкости - большой. Thus, the lower level is limited by the recommended volume control range, and the upper level is calculated based on the current and voltage limits in the highest quality mode for this device, which we define as equivalent to class A.
For headphones, based on their sensitivity, ambient conditions and the required volume level, the required voltage is calculated.
If the required voltage value is under the green area, then the headphones will be too sensitive for Apple iPhone 5S and to set the optimum volume level it will be necessary to lower the level by more than 36 dB from the maximum. If the value is above the green area, but does not exceed the gray area, then the headphones will give the necessary volume level, but the sound will be less qualitative, because the amplifier will work already in less qualitative equivalent modes AB , B and maximum level. If the value exceeds the maximum level, then the necessary volume level can not be reach, or will be clearly heard the "wheezing sound" from clipping.
Sensitivity - the sensitivity of the headphones to the voltage. Correction for a music signal of 20 dB to account for the unevenness of the volume on the sound track. Output Voltage - the level of the output voltage of the amplifier in dBV when loaded of the headphone impedance.
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The correction for external circumstances is the noise of the environment and the presence of noise insulation in the headphones. Thus, we calculate the star rating for the table. You can study formulas more detailed. The analysis for specific headphones can be viewed separately by selecting the appropriate headphone models on professional graphics. Analysis of use Apple iPhone 5S with headphones of different acoustic design. This rate primarily depends on the acoustic design of the headphones and the field of application of the headphones.
Additionally, depending on the acoustic design, a correction is made to calculate the optimum volume level at which headphones are supposed to be used. In closed-type headphones due to noise isolation from outside sounds, the volume level can be slightly reduced, in calculations it is equal to -6 dB. The table shows the options with closed and open headphones and ratings from 1 or 5. Recommendation by compatibility of headphones with Apple iPhone 5S based on measured characteristics.
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Есть незначительный запас по регулировке громкости в тихую область на 9. Возможно, с такими наушниками будет слышен фоновый шум усилителя. Есть небольшой запас по регулировке громкости в тихую область на Усилитель недостаточен для работы с такими наушниками, он будет тихим.. Есть запас по регулировке громкости в тихую область более 36 дБ.. Есть большой запас по регулировке громкости в тихую область на On-line comparison and selection services for Apple iPhone 5S.
Comparison of basic characteristics Apple iPhone 5S versus other models. Voltage, Current and Impedance.
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Compare a changed frequency response the bundles of Apple iPhone 5S and headphones. Comparison of the power characteristics of Apple iPhone 5S and interaction headphones. Additional headphone compatibility analytics.
The Apple iPhone 5S test was conducted as a black box test, without regard to cost and prestige. This is the basic principle for making measurements, measurement reports and developing tests in RAA. I believe that it is important to do not make an absolute assessment of the device, but an aggregate assessment when working together with a headphones and taking into account external factors. This allows you to effectively reveal the potential of the entire set of devices or to make a more optimal choice of components.
Known by the nickname romanrex Аuthor of articles iXBT. Original text in Russian page. You can help us with the correct translation into English. Want to leave a comment or ask a question? Register now or log in. Voltage Not loaded Max F. Current in equal class A F. Detailed Quotes — Quote grid with instrument type-specific configurations and the ability to customize the grid with hundreds of data points.
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