Lower impedance headphones are louder - right? So get low impedance headphones so you’ll be able to run them nice and loud from your phone or laptop? This is true but it’s only part of the story. So what does this mean and why is it significant? The impedance of headphones is often overlooked but it shouldn’t be. More information can be found on the Apple support website. With impedance detection, adaptive voltage output, and a built-in digital-to-analog converter that supports sample rates of up to 96 kHz, you can enjoy high-fidelity, full-resolution audio directly from the headphone jack on your MacBook Pro.
This may remove the need for an external headphone amplifier. For headphones with an impedance of 150 to 1k ohms, the headphone jack delivers 3 volts RMS.
When you connect headphones with an impedance of less than 150 ohms, the headphone jack provides up to 1.25 volts RMS. Your Mac can detect the impedance of the connected device and will adapt its output for low and high-impedance headphones, as well as for line-level audio devices. The 3.5 mm headphone jack on the MacBook Pro (14-inch, 2021) or MacBook Pro (16-inch, 2021) features DC load detection and adaptive voltage output. In the document published October 27th 2021 and titled Use high-impedance headphones with new MacBook Pro models Apple explains Apple has released a support document explaining in detail the technology behind the high impedance headphone output on the new MacBook Pro using the new Apple Silicon powered M1 Pro and M1 Max chips.
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