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A good audio system should reproduce impulses as accurately as possible. This effect, too, is typically stronger for low impedance headphones.Īnother aspect of sound fidelity is impulse response. If it is relatively high (above 50 ohms), it will translate the headphone’s impedance curve into audible changes in frequency response. How much, depends on the headphone amplifier – more specifically, its output impedance. This, in turn, may affect the frequency response.
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At lower frequencies the actual impedance may be much higher, sometimes by a factor of two or three. The impedance rating you’ll find in the data sheet is usually measured at 1 kHz. Impedance is not a static value but may vary over frequency. Such headphones will be plenty loud on any phones output. Therefore, most modern headphones are low impedance models, typically ranging between 16 and 100 ohms. Such devices require low impedance headphones to achieve adequate volume. Mostly because we use more and more battery powered devices and other gear operating on low voltage rails (e.g. These days, high impedance headphones have become quite rare. Up until the 1990s, studio headphones tended to be high impedance models (250 – 600 ohms). That’s also true for headphones: Low impedance models are usually “louder” than high impedance headphones. As you may know, a 4 ohms loudspeaker is typically much louder than a 16 ohms loudspeaker of the same type – at least on a solid state amplifier (tube amplifiers often have dedicated outputs for various speaker impedances). That’s quite a scale! Loudspeakers, by comparison, only range from about 4 ohms to 16 ohms. Headphones come with impedance ratings ranging from about 16 ohms to 600 ohms. Modern headphones are often around 105 dB-SPL/mW, which is ample. Sensitivity varies quite a bit from about 80 to 125 dB SPL/mW. But you can find online calculators on the web such as this one: Let’s just say that the higher the figure, the “louder” (i.e. Both methods are widespread, and, unfortunately, the conversion formula is quite complex. Sensitivity is specified as either sound pressure level per volt (dB SPL/V) or sound pressure level per milliwatt (dB SPL/mW). Due to advances in technology, modern headphones tend to be “louder” than older models. Which is to say, they produce different volume levels at a given input level. Headphones come with different sensitivity ratings. There are two key parameters that determine how “loud” your headphones are: