Updated October 2026 · Audio basics for beginners
A microphone frequency response chart shows how sensitive the microphone is across the range of sound, from low to high frequencies. A flat chart is not always the best choice for voice, because some microphones are shaped on purpose to flatter speech. Use the chart as one guide, and judge the microphone on how your own voice sounds.
Almost every microphone comes with a frequency response chart, a line that shows how sensitive the microphone is at different pitches. Beginners often take that chart as the measure of quality, and they assume a flat line is always best. The chart is useful, but it does not tell the whole story. It shows what the microphone picks up, not how a particular voice will sound in a particular room.
This post explains what the chart shows, how to read it, why a flat response is not always the goal for voice, and how to use the chart when choosing a microphone.
A frequency response chart plots the microphone’s sensitivity, usually in decibels, against frequency, from the lowest bass to the highest treble. A line that stays level across the range indicates an even response. Peaks in the line show frequencies the microphone emphasises, and dips show frequencies it reduces. The chart is usually measured under controlled conditions, often on a test bench rather than in a real room.
The result tells you how the microphone responds to different pitches, which is useful information. It does not describe the room, the distance or the voice.
A perfectly flat microphone captures sound accurately, which is valuable for measurement and for recording instruments that must be heard exactly. For speech, many people prefer a microphone that adds a little warmth in the low middle range, or a slight presence boost in the upper middle, which makes the voice clear and close. Some microphones are designed with that kind of shaping, and it can suit a voice well.
A flat chart can also make a bright or harsh voice sound harsher, while a shaped response may flatter it. The chart cannot tell you which will suit your voice best.
Many directional microphones change their low-frequency response when you move closer, an effect called proximity. The bass rises as the microphone gets nearer to the mouth, which can make a voice boomy. The chart often shows the response at a fixed distance, so the sound you hear will change with your position. Keep the distance steady, and test the sound at the distance you will use.
The chart may come with a polar pattern, which shows how the microphone responds to sound from different directions. A cardioid pattern rejects sound from behind, which helps reduce room noise and echo. That pattern is often more important for home recording than a small difference in the frequency line.
The chart cannot tell you how the microphone will feel to use, whether it handles plosives well, how it reacts to a particular voice or how it sounds in your room. It also cannot tell you about noise, sensitivity or durability. Those factors often matter as much as the frequency line, and they can only be judged by listening and using the microphone.
A useful exercise is to lay two charts side by side and compare the shapes, not the single line. Look at where each microphone rises and falls in the speech range, and ask which shape suits the voice you record most. A rise in the upper middle may add presence to a soft voice but harshness to a bright one. Keep a note of the comparison, so you can recall why you chose a microphone when the question comes up again.
Remember that the chart is measured on a test rig, and your room will add its own shape. The difference between two microphones may be smaller in a real room than the charts suggest, or it may be larger if one microphone is much more sensitive to reflections.
Frequency response charts vary in how they are measured, and claims based on them can be misleading. Use the chart as one piece of evidence, and do not treat it as a ranking of quality. The best microphone is the one that suits your voice and your room.
A simple test recording reveals how your microphone and voice work together. The Vocal Checker shows clipping, noise and level problems in a recording you own, which helps you judge a test. The Tunedzy Go page covers cleaning a phone recording. For how to choose a microphone for home voice work, read the microphone guide in this series.
Spot clipping, noise, rumble and level problems. Runs in your browser, nothing is uploaded.
Not for voice. Some shaping can flatter speech, depending on the voice and the room.
Proximity boosts the bass on some microphones. Move slightly back or adjust the distance.
Use it as one guide. Listen to the microphone with your own voice before deciding.
The overall shape and the note about distance and polar pattern.
