Single-Band Peaking EQ
Applies one Web Audio peaking BiquadFilterNode with Q = 1 at the selected center frequency and gain. The filtered channels are rendered offline and exported as 48 kHz PCM16 WAV.
About this single-band peaking eq
Apply one peaking equalizer band at the selected center frequency and gain, then export WAV.
How this tool works
Applies one Web Audio peaking BiquadFilterNode with Q = 1 at the selected center frequency and gain. The filtered channels are rendered offline and exported as 48 kHz PCM16 WAV.
- Download the example file and select it in the file input.
- Set the visible controls to: Center frequency (Hz) = 440; Gain (dB) = -20
- Click “Process locally”.
- Download the result and inspect: czoa-audio-graphic-eq.wav — PCM16; 48000 Hz; 2 channels; 72000 frames
Worked example
Scenario: Example file: /examples/audio-stereo.wav; Download the example file and select it in the file input. Set the visible controls to: Center frequency (Hz) = 440; Gain (dB) = -20 Click “Process locally”. Download the result and inspect: czoa-audio-graphic-eq.wav — PCM16; 48000 Hz; 2 channels; 72000 frames
Sample input:
Illustrative output:
Limits and verification
Center frequency is 20–20000 Hz and gain is −60 to +24 dB. Q is fixed and there is only one band. Positive boosts can clip at PCM export; a filter transient can occur at the start.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
- W3C Web Audio API 1.0 — browser decoding and offline rendering
- Microsoft RIFF/WAVE PCM and WAVEFORMATEXTENSIBLE
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Download the example file and select it in the file input.
- Set the visible controls to: Center frequency (Hz) = 440; Gain (dB) = -20
- Click “Process locally”.
- Download the result and inspect: czoa-audio-graphic-eq.wav — PCM16; 48000 Hz; 2 channels; 72000 frames
Frequently asked questions
How does Single-Band Peaking EQ process the signal or file?+
Applies one Web Audio peaking BiquadFilterNode with Q = 1 at the selected center frequency and gain. The filtered channels are rendered offline and exported as 48 kHz PCM16 WAV.
How can I reproduce the Single-Band Peaking EQ example?+
Example file: /examples/audio-stereo.wav; Download the example file and select it in the file input. Set the visible controls to: Center frequency (Hz) = 440; Gain (dB) = -20 Click “Process locally”. Download the result and inspect: czoa-audio-graphic-eq.wav — PCM16; 48000 Hz; 2 channels; 72000 frames
What limits apply to Single-Band Peaking EQ?+
Center frequency is 20–20000 Hz and gain is −60 to +24 dB. Q is fixed and there is only one band. Positive boosts can clip at PCM export; a filter transient can occur at the start.
What does browser-isolation evidence establish?+
Network requests observed during the example contained no selected-audio payload while the fixture attenuated the 440 Hz band and decoded WAV. The observation is limited to that tested browser value path; unrelated resources and environments remain outside it.