Use a browser-based three-band equalizer when your device or app has no usable audio equalizer: it processes one selected file locally, limits PCM peaks to 0.99 when needed, and exports the complete result as a PCM16 WAV. The Audio Equalizer page provides Bass, Mid, and Treble controls, each accepting whole-number gains from -12 dB through +12 dB. It is a practical alternative when a built-in system control is missing, inaccessible, or not exposed by the current playback app; it does not repair speakers, drivers, Bluetooth profiles, or operating-system routing. Instead, it works on one selected file in the current browser tab. The source audio, decoded samples, EQ settings, filename, and result are not sent to Lizely, and the output is a new uncompressed WAV rather than an edited version of the original MP3, AAC, or other container. For a clean result, begin with modest adjustments, apply the EQ, check the reported raw peak, output peak, safety scale, sample rate, and frame count, then preview and compare at a similar perceived level before downloading. If the browser cannot decode the source codec, or the file exceeds the accepted size, duration, channel, sample-rate, or sample-count limits, the tool rejects it rather than silently trimming the recording.
A browser-based route around a missing equalizer
If your goal is to rebalance a saved track and keep a separate copy, a file-based browser workflow can replace the missing control. Audio Equalizer acts on one decoded file in the current tab rather than changing operating-system, player, or device-wide settings. It therefore serves as a practical fallback for a saved track, but the processed result applies to the exported WAV rather than to every app or stream you open later.
The browser decodes the selection with Web Audio, and the Web Audio API AudioBuffer reference describes the decoded-buffer model behind that local processing step. Codec support depends on the current browser and operating system. MP3, WAV, M4A, AAC, Ogg, WebM, and FLAC can be decoded when that combination supports the actual codec. A familiar extension is not a guarantee because a container can hold a codec the browser cannot read.
The three controls and what they adjust
The three controls provide broad tonal adjustments with these disclosed centers and ranges:
| Control | Center frequency | Gain range | Effect |
|---|---|---|---|
| Bass | 100 Hz | -12 to +12 dB | Boosts or cuts energy broadly around the low-frequency center. |
| Mid | 1,000 Hz | -12 to +12 dB | Boosts or cuts energy broadly around the middle-frequency center. |
| Treble | 10,000 Hz, or floor(decoded sample rate × 0.45) when that is lower | -12 to +12 dB | Boosts or cuts energy broadly around the high-frequency center. |
At low sample rates, the treble center is reduced to 45% of the decoded rate so it remains below the Nyquist limit instead of asking an invalid digital filter to operate outside the available spectrum. Every band uses a peaking-EQ biquad with Q=1 based on the equations published in the W3C Audio EQ Cookbook. The sections cascade in Bass, Mid, then Treble order. A peaking filter affects a region around its center rather than every frequency below or above a hard boundary. Setting all three controls to zero is a genuine flat path: the tool copies the decoded channel samples without running a nonzero filter section. Positive values boost energy around a band center, while negative values cut it.
Equalize one file in the browser
Use this sequence to produce a complete, checked file rather than relying on a missing playback control.
- Open the Audio Equalizer and choose one browser-decodable file. It must be 50 MiB or smaller and decode to no more than five minutes, one through eight channels, 8,000 through 192,000 Hz, and no more than 30 million channel samples. A file that breaks a limit is rejected before filtering and is never silently truncated.
- Set Bass, Mid, and Treble to whole-number values from -12 through +12 dB. Start with small positive or negative adjustments if the goal is a subtle change, because a strong boost can make noise or harshness more obvious.
- Apply the equalizer locally. The page converts each selected decibel gain into the coefficient parameter defined by the W3C Audio EQ Cookbook, normalizes each coefficient by a0, and runs the second-order recursive filters over every decoded channel. Each accepted channel uses identical settings and keeps the same number of sample frames.
- Read the raw peak, output peak, exact safety scale, decoded sample rate, and frame count. The raw peak is the largest absolute processed sample across all channels. Preview the result at this stage and note whether the safety action reduced the overall level.
- Download the complete PCM16 WAV when the preview sounds right. The file contains the full processed result rather than a preview excerpt, and the page reports the resulting byte count and decoded technical values for verification.
Why the safety scale may lower the level
Cascaded boosts can create samples above digital full scale even when the input did not clip. The tool measures the absolute peak across every processed sample and every channel. If the raw peak exceeds 0.99, one uniform scale factor reduces the entire processed result so its largest magnitude becomes 0.99.
| Processed raw peak | Tool action | Result |
|---|---|---|
| 0.99 or lower | No peak-limiting reduction is required. | The output peak remains at the raw peak. |
| Above 0.99 | One uniform factor reduces all processed channels together. | The output peak becomes 0.99, and the interface reports the exact safety scale. |
This action prevents the PCM encoder from independently chopping individual peaks, but it can reduce the overall level. It is not loudness normalization and does not target LUFS, RMS, replay gain, or a streaming-platform specification. Treat the raw peak, output peak, and exact scale as technical checks, not proof that the tonal balance is improved.
What the downloaded WAV contains
The export is a new file rather than a repackaging of the source. Its important technical properties are:
- Decoded sample rate: Web Audio may resample while decoding, so the tool reports and writes the decoded sample rate instead of claiming that the source container rate survived unchanged.
- Channel structure: Every accepted channel is filtered independently with identical settings, retains the same number of frames, and is recorded using the actual channel count.
- PCM encoding: Float samples are converted to signed 16-bit little-endian PCM and interleaved by frame in a new uncompressed PCM16 WAV.
- Metadata: The original codec, compression mode, bitrate, tags, artwork, chapters, loop markers, and container-specific metadata are not preserved.
The RIFF header records the actual channel count, sample rate, byte rate, block alignment, bit depth, and complete data length; Microsoft's WAVEFORMATEX reference documents the underlying PCM format fields. A decode failure produces an error and no stale download is presented.
Judge the result by listening, not only by the numbers
Use the preview and reported values as checks, not as proof of a desirable mix. Listen on the speakers or headphones that matter, compare the processed copy with the original at a similar perceived level, and avoid judging only from louder output. Strong boosts may emphasize noise, sibilance, rumble, or distortion already present in the recording.
A cut is often safer than stacking several boosts. If a setting creates an imbalance, return to the flat setting or make a smaller adjustment before exporting another copy. The goal is a controlled tonal change, not simply a higher peak value.
When a full audio editor is the better choice
Audio Equalizer is a compact three-band equalizer, not a graphic 10-band system, a linear-phase mastering processor, an automatic room-correction system, or a guarantee that one setting will improve every recording. Use a full audio editor when you need precise center frequencies, adjustable Q, spectrum analysis, automation, linear-phase processing, loudness metering, dithering controls, codec selection, or metadata preservation. For the immediate goal of adjusting a browser-decodable file and keeping a complete PCM16 copy, the three-band workflow provides a clear local solution.
Related reading: Audio Equalizer Limits, Peak Scaling, and WAV Output.
Related reading: What Should I Review After I Use an Audio Equalizer?.