How to Read Headphone Frequency Response Charts

Every serious headphone review includes a frequency response chart — a graph showing how loud the headphone plays each frequency from deep bass to high treble. Most people skip right past it. But once you know how to read one, you can predict how a headphone sounds before you ever put it on your head.

The Basics: What the Chart Shows

The horizontal axis (X) shows frequency in Hertz (Hz), from about 20Hz (deep bass) on the left to 20,000Hz (high treble) on the right. This is the range of human hearing.

The vertical axis (Y) shows loudness in decibels (dB). Higher on the chart means louder. Each 10dB increase sounds roughly twice as loud.

A perfectly "flat" headphone would show a straight horizontal line — every frequency played at exactly the same volume. In practice, no headphone is perfectly flat, and a slight downward slope from left to right is actually preferred because it matches how we naturally perceive sound.

The Frequency Regions

Sub-Bass (20-60Hz): The Rumble

This is the chest-thumping low end you feel in movie theaters. If the line dips down in this region, the headphone won't produce deep bass well. If it's elevated, the bass will feel powerful and physical.

Example: A headphone with a -6dB dip at 30Hz will sound thin on bass-heavy music. One with a +3dB bump will have a satisfying rumble.

Mid-Bass (60-250Hz): The Punch

This is where kick drums, bass guitars, and the warmth of male vocals live. A bump here makes music sound "warm" and "full." Too much makes everything sound "muddy" and "boomy."

Midrange (250Hz-2kHz): The Voice

This is the most critical region for clarity. Vocals, guitars, pianos, and most instruments have their fundamental tones here. A dip in the midrange makes music sound hollow and distant. Elevation makes it sound forward and intimate.

Upper Midrange/Presence (2-5kHz): The Edge

This region determines how "present" and "detailed" vocals and instruments sound. A peak around 3kHz makes vocals sound clear and intimate. Too much makes the headphone sound harsh and fatiguing over long sessions. The Sennheiser HD 560S ($129) handles this region particularly well, with a gentle presence peak that adds clarity without harshness.

Treble (5-10kHz): The Sparkle

Cymbals, sibilance in vocals (the "s" sounds), and the shimmer of acoustic instruments live here. A peak around 6-8kHz adds "air" and "detail" but can also make sibilant recordings painful. A dip makes the headphone sound "dark" and "smooth."

Ultra-High Treble (10-20kHz): The Air

Most people over 25 can barely hear above 15kHz. This region contributes a subtle sense of "openness" and "air" to the sound. Don't stress about this region unless you're under 20 with perfect hearing.

What Different Profiles Look Like

"Neutral" (Studio Reference)

A roughly flat line from 20Hz to 10kHz with a gentle downward slope. This is what mixing engineers use. It reveals recordings as they were mastered — flaws and all. The beyerdynamic DT 900 Pro X ($229) is a great example.

"V-Shaped" (Consumer Fun)

Elevated bass (20-200Hz), scooped midrange (500Hz-2kHz), elevated treble (5-10kHz). The most popular consumer tuning because it makes everything sound exciting and energetic. Most Beats and Sony consumer headphones use this profile.

"Warm" (Smooth and Full)

Elevated bass extending into the midrange, neutral to slightly recessed treble. Comfortable for long sessions and flattering to most music. Prioritizes smoothness over detail.

"Bright" (Detailed and Analytical)

Flat or slightly reduced bass, elevated upper midrange and treble. Reveals maximum detail but can be fatiguing. Preferred by classical and jazz listeners who want to hear every instrument clearly.

How to Use Charts When Shopping

Step 1: Know Your Preference

If you love bass-heavy music, look for headphones with an elevated sub-bass and mid-bass region. If you want clarity for podcasts and vocals, look for a slight presence peak around 2-3kHz without a scooped midrange.

Step 2: Compare to a Target Curve

Reputable reviewers compare headphone measurements against a "target curve" — an agreed-upon ideal frequency response. The Harman target curve is the most widely used. When the measured line follows the target closely, the headphone sounds "right" to most listeners.

Step 3: Look for Spikes and Dips

Narrow spikes (peaks) in the frequency response create ringing and harshness. Narrow dips create "holes" where certain sounds disappear. Broad, gentle curves are fine. Sharp, narrow deviations are problems.

A peak of +5dB or more at any frequency is a red flag. The Sony WH-1000XM5 ($298) is lauded partly because its frequency response is smooth with no harsh peaks.

Step 4: Check Multiple Reviews

No two measurement systems are identical. A headphone that measures one way on one reviewer's rig might look slightly different on another's. Look for consistent trends across multiple reviews rather than fixating on one chart.

The Limitations

Frequency response doesn't tell you everything. It doesn't capture:

• Soundstage width (how spacious music sounds)
• Imaging (how precisely you can locate instruments)
• Transient response (how quickly the driver starts and stops)
• Distortion (how clean the sound is at high volumes)

These qualities matter, but frequency response is still the single most informative measurement available.

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