Why do my mixes sound thin? 6 fixes that add body

A thin mix almost always has too little energy between about 100 and 300 Hz, the range that gives sounds their body. It usually comes from cutting too much low end, from parts that wipe each other out, or from an arrangement where nothing plays in that range.

That's the short answer. The rest of this guide shows you how to find which of the three is yours, so you add body where it's missing instead of boosting bass on everything.

What "thin" actually means

Thin is not a lack of bass. Plenty of thin mixes have a loud sub and a loud kick.

What's missing sits just above that: the weight of a snare, the chest of a vocal, the lower notes of chords, the upper part of a bass. When that range is weak, you hear:

• Bass at the bottom, hats and vocals at the top, and a hole between them.
• A mix that sounds small and far away, even when it's loud.
• Vocals and leads that sound sharp instead of warm.

So thin is a frequency balance problem. The lows, the mids and the highs are all there, but one part of the picture is too quiet next to the others.

Fix 1: Compare with a song you love before you touch anything

Your ears get used to a thin mix in minutes. After a while it just sounds "clean".

So give them a fixed point. Load a released song in the same style as yours, turn it down until it plays at the same loudness as your mix, and switch between the two every few seconds. Listen only to the range between the bass and the vocal. If the song sounds warmer and closer there, you've confirmed the problem.

If it doesn't, your mix may have too much top end instead, which also reads as thin. Fix 6 covers that case.

The full method is in our guide on how to use reference tracks for mixing.

Fix 2: Undo the cuts you made on autopilot

This is the most common cause. A high-pass filter (it removes everything below a frequency you choose) on every track, each one set a little too high.

One filter does little harm. Twenty of them remove the body of the whole mix.

1. Turn off the high-pass filter on one part and listen to the full mix, not the part alone.
2. If the mix gets warmer and the low end stays clear, leave the filter off or set it lower.
3. If the low end gets cloudy, turn it back on.
4. Repeat for vocals, guitars, keys, pads and snare.

Do the same with any cut between 100 and 300 Hz that you added "to make room". Some of those cuts were needed. Many were habit.

Fix 3: Listen in mono

Two sounds can each be full on their own and thin together. When their waves move in opposite directions, they turn each other down, and the low end suffers first.

The fast check: switch your master to mono. Most DAWs have a utility plugin with a mono button.

• A part gets much quieter or hollow in mono. It's a wide stereo sound whose left and right sides work against each other. Use less of the widening effect, or keep it only on the higher frequencies.
• Two layers sound weaker together than apart. Common with layered kicks, kick with bass, and two microphones on one instrument. Flip the polarity of one layer (the button marked ø). If the sound gets fuller, keep it flipped.

This matters outside your studio too. Many Bluetooth speakers play in mono or close to it, so a mix that thins out in mono thins out there.

Fix 4: Fill the hole in the arrangement

Sometimes nothing was cut. The range is empty because no part plays in it.

Look at your notes. If the bass plays low, and the chords, lead and vocal all sit two octaves above it, there's nothing in between to give the track a body. No EQ can turn up a note that isn't played.

Three ways to fill it:

• Move the chords down an octave, or add one lower note to each chord.
• Double a part with a quiet layer an octave below.
• Give the bass a sound with more upper harmonics, so it reaches higher.

Add one thing and compare with your reference song again. Stop when the hole closes.

Fix 5: Choose fuller sounds before you reach for EQ

An EQ boost only turns up what's already in the sound. If a snare sample has no weight, a boost at 200 Hz raises noise and room tone, not weight.

So when one part sounds thin on its own, swap it before you treat it:

• Pick a different sample with more body.
• On a synth, add an oscillator one octave down.
• On a recording, move the microphone closer next time. For now, layer something under it.

A sound that's right at the source needs almost no fixing later.

Fix 6: Add body with one wide boost, or take away top

Now EQ, and only on the one or two parts that should carry the body in this section.

• Try a boost of 2 to 3 dB somewhere between 100 and 300 Hz.
• Keep the shape wide. A narrow boost makes one note ring.
• Sweep slowly, listening to the full mix, and stop where the part gets warmer without getting boomy.

If the whole mix still sounds thin, check the other end. Too much energy in the highs makes everything under it seem weak. Turn down the brightest parts by a few dB, or ease off the high boosts you added, and listen again at matched loudness with your reference song.

Go in small steps. Too much body is its own problem, and we cover it in why a mix sounds muddy.

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How to check you fixed it

Three quick tests:

1. The reference test. At matched loudness, the range between your bass and your vocal sounds as warm as in the song you love.
2. The mono test. In mono, the mix keeps its weight.
3. The low-volume test. Turn your speakers right down. If the track still sounds like one solid thing, and not a bass and a hiss, the balance works.

If one test fails, go back to the fix it points to: Fix 2 for cuts, Fix 3 for mono, Fix 4 for the arrangement.

Why this keeps happening

A thin mix is rarely one big mistake. It's twenty small moves, each made without hearing what it took away.

The way out is to hear the three things a pro hears separately in every mix: frequency balance, dynamics and stereo image. Once you hear the body of a mix as its own range, you notice the moment it starts to go, and you stop before it's gone.