Bass.
A shelf at 100 Hz: everything below rises or falls together. Warmth, or boom to remove.
SOLIPSIUM Super resolution audio engine
Free audio tool
Raise or lower the bass, middle and treble of a recording.
Set each band from -12 to +12 dB. Your browser changes the tone and keeps the peaks under -1 dBFS, and says when it had to turn the whole file down. Nothing is uploaded.
Drop a recording here
Your browser does the work on this device. Nothing is uploaded.
WAV, MP3, M4A, FLAC, OGG, Opus and more, up to 30 minutes or 200 MB.
Equalizer
The three bands
Where each band acts.
Each band is one filter from the Audio EQ Cookbook, the formulas most equalizers are built on.
Middle.
A wide band around 1 kHz: where a voice sits forward or back.
Treble.
A shelf at 8 kHz: air and sparkle, or harshness to soften.
Peaks
Kept under full scale.
Raising a band raises the peaks with it.
Set the bands.
Whole decibels, from -12 to +12. A band at 0 is left out.
Change the tone.
When the result would pass -1 dBFS, the whole file is turned down until its loudest peak sits there, and the result says by how much.
Save it.
As an MP3 at 192 kbps or a 16-bit WAV, at the file's own sample rate.
Questions
About equalizing.
Can treble bring back a muffled recording?
It can lift what is still there. Sound a phone line or a low bitrate cut off is gone, and raising the treble raises only the hiss above it. The home page's check says where a recording's sound stops.
Why did it get quieter?
Raising a band raised the peaks, and the whole file was turned down to keep them under -1 dBFS. Normalize it afterwards to set its loudness.
Cut rumble?
Lower the bass, or use the high-pass filter, which cuts below a corner you choose.
Can I hear it before saving?
Yes. The result plays on the page, up to five minutes long.
Is my recording uploaded?
No. Your browser opens the file and does the work on this device; nothing is sent to Solipsium. Checking a recording for noise, hum and clipping is another page: the home page checks it in your browser too.
Free audio tools
Related free tools.
For tone and level.
- High-pass filter
Cut the sound below 60 to 150 Hz.
- Normalize audio
Set the result to a loudness target.
- Fix muffled audio
When a phone line's lost treble is rebuilt.
- Audio spectrum check
See where a file's sound stops.
- All free audio tools
Every free tool on one page.
Muffled rather than dull?
Drop the recording on the home page: the check says where its sound stops, and a phone line's treble can be rebuilt in the first 20 seconds, labelled inferred.
Check a recording
The check and the 20-second try need no account.