Understanding Headphone Impedance and Sensitivity: What It Means for Sound Quality in 2026

Impedance and sensitivity are the two most important headphone specs that most people ignore — and misunderstanding them leads to buying headphones that sound quiet, distorted, or require gear you do not own. Here is the simple explanation.

Impedance (Ω — Ohms): How Much Power They Need

Low impedance (16–32Ω): designed for phones, laptops, and portable devices. Most consumer headphones and all wireless headphones fall here. Easy to drive; no dedicated amp required.

Medium impedance (48–150Ω): designed for audio interfaces and dedicated headphone outputs. The Sennheiser HD560S (120Ω) and Beyerdynamic DT 700 Pro X (48Ω) are in this category. Most audio interfaces can drive these adequately.

High impedance (250–600Ω): designed for dedicated headphone amplifiers. The Sennheiser HD600 (300Ω) and Beyerdynamic DT 770 Pro 250Ω fall here. Plugging these into a phone or laptop produces weak, bass-light sound. You need a headphone amp or high-output audio interface.

Sensitivity (dB/mW): How Loud They Get

Sensitivity measures how efficiently headphones convert electrical power into sound. Higher sensitivity = louder at the same power. A headphone with 100 dB/mW sensitivity will sound twice as loud as one with 90 dB/mW from the same source. Combined with impedance, sensitivity determines if you need a dedicated amplifier.

The Simple Rule

Under 80Ω + sensitivity above 100 dB/mW → phone or laptop is fine. 80–150Ω → audio interface recommended. Over 150Ω → dedicated headphone amp is required. See our headphone buying guide for specific recommendations.