Audio Tools

Bass Booster

Boost low frequencies locally with a live low-shelf EQ, same-position original/boosted A/B, response and headroom evidence, explicit clip-guard choices, and verified WAV export.

Live low-shelf EQ · local A/B · render evidence

Bass Booster & Low-Shelf EQ Studio

Shape low-end weight in the browser without uploading audio. Adjust a 60–250 Hz low-shelf while the source plays, switch instantly between original and boosted branches at the same playhead, inspect the actual filter response and decoded-sample headroom, then render and export a verified WAV.

Live same-position A/B60–250 Hz shelf · −12 to +18 dBWarm · Punch · Deep presetsWaveform + response curveOff · auto-trim · browser compressorWAV · audit CSV · Project JSON · Print

1 · Source & live preview

Choose audio

No audio decoded yet.

Input sample peak—

Input RMS—

Crest factor—

Sample headroom—

0:00 / 0:00

2 · Bass shape

Bass gain+6.0 dBShelf frequency120 HzPeak guardGuard target-1.0 dBFSWAV export

Load audio to calculate source headroom and render evidence.

3 · Rendered result

Output sample peak—

Output RMS—

Output crest—

Auto-trim—

Peak change—

RMS change—

Playback caution: boosted low frequencies can sound much louder on headphones, subs and car systems. Start playback at a comfortable device volume.

4 · Handoff & repeat use

What this bass render proves — and what it does not

Low-shelf semantics

The Web Audio lowshelf filter boosts or attenuates frequencies below the selected shelf frequency while leaving higher frequencies broadly unchanged. Gain is expressed in dB.

Live A/B

Dry and processed branches share the same AudioBufferSourceNode, so the Original/Boosted switch compares the same playhead rather than two separately started audio elements.

Sample-peak auto-trim

After offline rendering, auto-trim reduces the rendered decoded-sample peak to the selected ceiling when needed. It is deterministic sample-peak protection, not inter-sample true-peak limiting.

Browser compressor

The optional DynamicsCompressorNode lowers loud parts of the signal. It can reduce overload risk but is not a mastering-grade brick-wall limiter or proof that downstream playback cannot clip.

Private local workflow

Audio is decoded and rendered in this tab. Project JSON and share links contain settings/evidence only; source audio, filenames and local history are excluded from share state.

Export truth

WAV output represents the browser-decoded PCM after the selected Web Audio processing. The tool does not preserve the source codec/container or claim lossless restoration of an already-compressed source.

Truth boundary: this is a browser low-shelf EQ and decoded-sample audit, not room correction, speaker calibration, LUFS mastering, ISO true-peak certification, hearing-safety certification, or restoration of clipped/compressed source detail. Codec support varies by browser. Bass boosting consumes headroom and can exaggerate rumble, noise, compression artifacts or speaker distortion.

Ready. Choose audio or generate the local test tone; this Studio does not upload the source.

Boost bass as an EQ decision, not a mystery percentage

Choose the shelf frequency that separates the low end you want to emphasize, then set gain in decibels. The response curve shows the actual Web Audio filter shape before you render.

Compare the same moment before committing

Live dry and processed branches share one source/playhead, so switching Original and Boosted is a genuine same-position A/B workflow instead of restarting two players and relying on memory.

Protect headroom transparently

Sample-peak auto-trim measures the rendered buffer and trims only when the selected decoded-sample ceiling is exceeded. The browser compressor is available as a different, dynamic option and is labeled separately.

Keep the evidence with the file

Before/after peak, RMS and crest evidence, the exact shelf settings and guard behavior can be copied or exported as CSV/Project JSON. Print/PDF gives a human-readable handoff while WAV is the processed audio result.

Know when another tool is better

Use the full audio equalizer when several bands need shaping, a high-pass filter for sub-rumble removal, the loudness analyzer for LUFS-style inspection, or the dynamic-range compressor when level control rather than low-frequency tone is the main goal.