frequency response
theoryFREE-kwen-see reh-SPONS
The range of audio frequencies a device can reproduce, typically measured in Hertz.
Human hearing spans roughly 20 Hz to 20,000 Hz, and audio equipment is designed to cover this range as evenly as possible. Speakers, headphones, microphones, and rooms all have characteristic frequency responses that colour the sound. A perfectly flat frequency response reproduces all frequencies equally, but most equipment has peaks and dips. Understanding frequency response is essential for choosing equipment, treating rooms, and making informed EQ decisions during mixing.