Bass Booster

A low-shelf boost centered under 200Hz — the same Equalizer engine, pre-set for an instant bass lift.

How to use the Bass Booster

  1. Add your audioDrop a file onto the page or tap to browse — or press “try a built-in sample” to explore first. Nothing is uploaded; the file is decoded on your device.
  2. Add bassRaise the Bass boost, choose how high the boost reaches (the shelf frequency) and add a little Punch. The curve shows the exact change.
  3. Apply and comparePress Boost the bass; keep the limiter on so the extra low end does not clip.
  4. DownloadPick MP3 or WAV and press Download. You can even listen to the exact file you just saved before you close the page.

About the Bass Booster

The Bass Booster adds weight and depth to music, voices and effects — with controls that matter for bass: where the boost starts, how much “punch” to add in the upper-bass range, and whether to filter out inaudible sub-bass.

Boosting bass is the fastest way to clip a file, so the tool trims overall level automatically as you add boost and ends with a true-peak limiter, giving a louder-sounding result without harsh distortion.

How the Bass Booster works

The chain is a second-order Butterworth sub-bass high-pass at 25 Hz (optional), a low-shelf filter at your chosen frequency with the chosen gain, a narrow peaking band at 1.7× that frequency for punch, and an automatic gain trim of one quarter of the boost (capped at 2 dB). A look-ahead limiter at −1 dBTP follows. Removing energy below 25 Hz matters because it is inaudible on most systems yet consumes headroom that the audible bass could use.

What people use it for

Headphones

Add warmth to thin earbuds.

Voices

Give a podcast host a deeper voice.

Car & small speakers

Make bass audible on small drivers using the punch band.

Beats

Add weight to kick drums.

Tips for the best results

  • 60–80 Hz = deep sub; 100–150 Hz = warmth and punch; above 200 Hz = muddy.
  • Add Punch (1–3 dB) rather than only more shelf boost if bass vanishes on phones.
  • Keep “Cut inaudible sub-bass” on for cleaner, louder bass.
  • A 6–9 dB boost is usually plenty.

Common problems & fixes

Bass sounds boomy or muddyLower the shelf frequency or reduce boost; add a cut near 250 Hz with the Equalizer.
It clipsKeep the limiter on and lower the boost.

Quick facts

Boost0–18 dB low shelf, 50–250 Hz
Punch0–6 dB peak at 1.7× shelf frequency
Sub-bass filter25 Hz high-pass (optional)
ProtectionAuto gain trim + true-peak limiter

Frequently asked questions

Will it work on speech?

Yes — use 3–5 dB at 100–140 Hz for a fuller voice.

Does it damage speakers?

Heavy sub-bass can; the 25 Hz filter helps prevent that.

Why does bass vary between speakers?

Small drivers can’t reproduce deep bass, which is why the Punch band exists.

Why is this the same tool as the Equalizer?

It's the identical engine, just opened with a sensible bass-boost starting point already dialed in — you can still adjust mid and treble too.

Will boosting bass cause distortion?

A large boost can push low-frequency peaks close to full scale. If the result sounds harsh, either lower the boost or run it through the Audio Normalizer afterward.

Your audio never leaves your device

This tool runs entirely in your browser using the Web Audio API. Nothing is uploaded, stored or shared — there is no server to send your file to, so it works offline once the page has loaded.

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