Mono, Distortion and Low-Pass Filters for a Cheap Mic Sound

A cheap microphone sound is not created by one control. Mono, distortion, and low-pass filtering affect different dimensions of the recording and become convincing when balanced around intelligibility.

Mono removes stereo width

Combining channels into mono centers the sound and removes spatial separation. It can suggest a single small microphone or speaker, but mono alone does not create low fidelity.

Distortion reshapes the waveform

Distortion adds harmonics and makes peaks feel clipped or overloaded. Moderate values produce grit. Extreme values can erase consonants and create uncomfortable high-frequency energy.

Low-pass filtering narrows the frequency range

A low-pass filter removes frequencies above its cutoff. A cutoff near the voice band creates a telephone or tiny-speaker character. Raising it preserves clarity; lowering it produces a more muffled result.

Combine them in order

Start with mono, set the filter, and add distortion last. This order makes it easier to hear which control causes a problem. Use the Low Quality Audio Maker and compare the completed Original and Worse previews.

LowQualityMaker's Cursed Mic preset provides a concrete reference point: it requests mono output, 8-bit PCM, an 11,025 Hz sample rate, strong distortion, and a 3,400 Hz low-pass cutoff. Those settings are intentionally aggressive. They imitate a damaged voice path rather than a particular voice-chat codec.

Choose settings for the failure you want

These ranges are listening starting points, not standards compliance claims. The requested sample rate or cutoff may be normalized by the browser, and the source voice matters as much as the numeric values.

A repeatable comparison

Choose ten seconds of speech containing soft vowels, sharp consonants, and one louder phrase. First process mono only. Next enable the low-pass filter and listen for lost consonants. Add distortion last and lower it until words remain understandable. Keeping the same source and playback volume makes the comparison more useful than switching recordings between attempts.

The completed file is PCM WAV. Check its reported sample rate, channel count, and bit depth, then listen to the downloaded file outside the tool. A WAV can be larger than the compressed input even when it sounds much worse because PCM storage and perceived quality are different concerns.

Avoid painful output

Distortion can create strong harmonics and sharp peaks. Begin at a low playback volume, especially with headphones, and compare loudness before judging texture. The objective is a recognizable cheap-mic effect, not unexpected high-volume playback.

For a ready-made combination, see How to Create a Cursed Mic Effect.

Sources and further reading

• Web Audio API specification — browser audio graphs, filters, waveshaping, and offline rendering.
• MDN OfflineAudioContext — rendering an audio graph into an AudioBuffer without playing it through the device.
• WAVE format description from the Library of Congress — background on the WAV container and PCM use.