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Tape players CD players These amps often have DACs digital-to-audio converters to convert the digital audio to analog audio in order to drive the headphone drivers. Headphone jack amps range in quality but are nearly all of poorer quality than the standalone amplifiers we're focusing on in this article.
Headphone jacks are often only capable of driving low-impedance headphones. Many professional and HiFi headphones are designed with higher impedances and would not perform at their potential if connected to a regular headphone jack. They must fit within the device and be in close proximity to the jack while also working on the device's power source often batteries.
That being said, there is certainly a market for high-end low-impedance headphones that will work effectively with our portable devices and their headphone jacks. Reaching The Full Potential Of The Headphones Speaking of reaching the full potential of our headphones, let's discuss how headphone amplifiers help us get the most out of our headphones. As mentioned, the built-in headphone jack amplifiers are often not powerful enough to drive high-end headphones.
Amplifiers need to deliver enough power to properly drive the headphones with clarity and precision without causing distortion at the peaks of the amplified audio signal. Let's first look at the headphones that would likely require amplification. There are plenty of factors that would allow headphone audio quality to be improved by an amp. Headphone sensitivity sometimes called efficiency is the relationship between the power of the audio signal sent to the headphones and the loudness of the resulting sound produced by the headphones.
The more sensitive a pair of headphones, the more sound volume they'll produce at a certain signal strength. Generally speaking, headphones with a sensitivity rating of 95dB or less are more likely to require a headphone amp. That being said, the sound of headphones with higher sensitivity ratings may very well be improved with an amplifier as well. Note that the amount of power a headphone amplifier is capable of providing its connected headphones is a product of the headphones' impedance.
Higher impedance headphones tend to require more power to produce the same amount of sound. The benefit that comes with higher impedance and requiring more power is that the headphones tend to sound more accurate. What Is Headphone Impedance? Headphone impedance is essentially the measure of the headphone drivers' resistance to the audio signal driving them.
All else being equal, higher impedance headphones ought to be less sensitive than lower impedance headphones since their drivers require more power to be driver effectively. However, headphone design plays a big role in determining these stats, and there is no correlation between impedance and sensitivity across different headphone designs. Generally speaking, headphones with higher impedances require stronger signals to drive their drivers.
Though any headphones could be hooked up to an amplifier connection types permitting , those with higher impedances would likely benefit more from an amplifier than those with lower impedances. The original circuit, published in and addressed to the worldwide do it yourself community, set the standard of high fidelity sound reproduction and served as a benchmark or reference amplifier design throughout the s.
The original circuit was copied by hundreds of thousands amateurs worldwide. The Williamson circuit was based on the Wireless World Quality Amplifier by Walter Cocking , with an additional error amplifier stage and a global negative feedback loop. Deep feedback, triode-connected KT66 power tetrodes, conservative choice of standing currents , and the use of wide-bandwidth output transformer all contributed to the performance of the Williamson.
It had a modest output power rating of 15 Watts [a] but surpassed all contemporary designs in having very low harmonic distortion and intermodulation , flat frequency response throughout the audible frequency range , and effective damping of loudspeaker resonances.
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