Thunder clipping is usually fixed by finding where the audio first overloads, reducing the level at that point, and then catching remaining peaks with an OBS limiter. A limiter belongs at the end of the OBS filter chain, but it cannot repair distortion introduced earlier in the chain.
For a continuous rain stream, test the loudest thunder passage rather than judging the quiet rain between storms. Listen before OBS, monitor the signal in OBS, and review a recording before leaving the channel unattended.
Recognise clipping in the audio chain
Digital audio has a maximum representable level called 0 dBFS. A signal that reaches or exceeds that ceiling at the delivered output can clip, producing a harsh, crackling or flattened sound. The OBS mixer can show peaks below that ceiling, but a clean-looking meter alone does not tell you whether the original file or an earlier device has already distorted.
Thunder is a difficult test signal because most of the track may be quiet, while one short crack or close rumble rises sharply. You may hear a fuzzy edge, a brittle crackle, or a sudden flattening of the transient. Distortion can also be subtle on small speakers, so use headphones if available and listen to the loud passage at a sensible volume.
In OBS, identify the mixer channel carrying the storm audio and watch it while the loudest thunder plays. The meter shows peak level and its hold marker preserves the highest reading for 20 seconds. OBS's technical documentation gives -9 dBFS as the permitted maximum reference for its sample peak meter; treat that as a meter reference with margin, not as a target for average loudness. See the OBS audio mixer technical details for how the display works.
A peak meter helps locate a level problem, but the listening point matters just as much. If the thunder already crackles in the player or at a device monitor before the sound reaches OBS, lowering an OBS fader will only make the damaged signal quieter. If it sounds clean before OBS but becomes rough in the OBS output or recording, investigate the later part of the chain.
Find the first overloaded point
Treat the route from file to listener as a sequence of checkpoints. Depending on your setup, it may be a video file or audio file, a media player, an operating-system volume control, an interface or mixer, an OBS source, source filters, the mixer fader, and finally the recorded or streamed output. You do not need every item in that list; check only what is actually in your signal path.
Start with the source that carries the thunder loop. Play its loudest passage and listen at the player or source output. If the file itself sounds distorted on a direct listen, the problem may be in the recording or in processing that was applied before you received it. A later gain reduction can make it quieter, but cannot restore the clean waveform that was lost.
Next, listen at any physical mixer or interface monitor you use, then monitor the corresponding OBS source. OBS's audio mixer guide recommends checking the source and then listening again through OBS audio monitoring. This staged approach helps separate a hot input from a level that becomes excessive later. The OBS mixer guide describes the monitoring route and controls.
Change one stage at a time and repeat the same thunder passage. If reducing the player output clears the roughness before the signal reaches OBS, that stage was implicated. If the player sounds clean but the interface monitor does not, investigate its input gain or processing. If both are clean and the OBS recording is rough, check OBS filters and levels and then inspect the recording itself.
It can help to write down what you hear at each checkpoint: “clean from player”, “crackles at interface”, or “clean in monitor, rough in recording”. That is more useful than turning every fader down at once, because multiple changes make it harder to identify the cause and may leave a quieter version of the same distortion.
Reduce level before the overload
Once you have found the earliest stage where the signal becomes rough, reduce level there. This may mean turning down the audio file or player, lowering the relevant application or operating-system level, reducing interface input gain, or trimming a mixer input. The right control depends on the setup; there is no single gain value that can be prescribed without knowing the source level and devices.
Then replay the loudest thunder section and listen again at the same checkpoints. Keep the rain audible, but do not use quiet rainfall as proof that the peak is fixed. Thunder is the material that exposed the fault, so the loudest passage must stay in the test. If lowering a control makes the whole loop too quiet, consider whether another earlier gain stage is overloading and a later fader is merely hiding it.
In OBS, a source fader is useful for balancing a clean signal against other sources. It is not a substitute for lowering a signal that already clips at an input. For example, if a USB interface is distorting before the sound reaches OBS, pulling its mixer channel down may reduce the displayed level while retaining the same crackle. Lower the interface input gain, then set a reasonable OBS mix level and listen again.
If the storm file is part of a visual loop, keep audio checks separate from video troubleshooting. A channel can have a stable picture while the sound is too hot. If you are building a repeating visual sequence, this guide to looping a video in OBS without a black frame addresses picture continuity; it does not replace testing the audio path described here.
Add a limiter at the end of the OBS filters
After the upstream signal is clean, add an OBS limiter to catch brief peaks that remain. Apply it to the source or channel carrying the thunder, open its Filters, add a Limiter, and place it after the other filters. OBS states that the limiter should be the last filter in the chain. Its Limiter Filter documentation lists a default threshold of -6 dB and release of 60 ms. Those are starting defaults, not a guaranteed setting for every storm recording.
A limiter reduces peaks that cross its threshold. It does not make every moment equally loud, and it cannot undo distortion that entered the chain before it. If the input is already crackling, the limiter may simply control the level of a crackling signal. Use it only after checking that the thunder is clean at the source and through any upstream device.
Start with the documented defaults, play the loud passage, and listen to the OBS monitor and a recording. If the thunder sounds pinched, abruptly flattened or as if the background swells after each strike, the limiter may be working too hard or the signal entering it may still be too high. Revisit the upstream gain first. Avoid chasing a particular threshold as if it were a universal recipe; the file's peaks and the rest of your chain determine the result.
A compressor is optional. It reduces signal above a threshold and can smooth broader loudness swings, but aggressive compression may take the natural contrast out of a storm. OBS places compressor use near the beginning of the chain; its documented defaults include a -18 dB threshold, 6 ms attack and 60 ms release. These figures describe the filter defaults, not recommended settings for your audio. Compare the sound with compression bypassed before deciding it helps. OBS's Compressor Filter documentation explains its controls.
An expander is not a clipping fix. It can attenuate low-level unwanted noise, but a threshold set too high may also suppress quiet rain. If you use one, OBS places it after compression or other effects and before the limiter. For a clean storm recording with no unwanted background noise, you may not need an expander at all.
| Control | Use it for | Placement and limitation |
|---|---|---|
| Source or device gain | Prevent an overload where it begins | Adjust at the earliest hot stage; later reduction cannot repair upstream distortion. |
| Compressor | Reduce broader swings above a threshold | Usually near the start; excessive action can flatten thunder dynamics. |
| Limiter | Catch brief remaining peaks | Last in the OBS filter chain; cannot repair a distorted input. |
| Expander | Reduce low-level unwanted noise | Before the limiter; a high threshold can suppress wanted rain. |
Monitor the loudest thunder passage
Choose a segment that includes the strongest crack or rumble in the actual loop. If you cannot remember where it occurs, listen through the file once and mark the passage. Do not test only the first few seconds or a quiet interval; the aim is to expose the peak that may appear only occasionally during an overnight broadcast.
Monitor the source before OBS if your player or device allows it, then use OBS audio monitoring to hear the signal after it reaches the mixer and filters. Compare the same section at both points. Headphones are a useful diagnostic aid because a small laptop speaker can hide a rough edge, but they do not prevent clipping or replace listening to a recording.
Watch OBS's peak hold as well as the moving meter. The hold marker remains for 20 seconds, so give it time to settle or reset it before a new pass if you want to compare changes. Do not mistake a single meter reference for the whole goal: the audio should remain clean when heard, and the delivered signal must stay below 0 dBFS to avoid clipping at the output.
Make adjustments in small, deliberate steps and replay the same passage after each one. Keep notes on the source level, device gain, OBS filter order and what changed in the sound. This makes it easier to return to a known clean state if a later adjustment makes the thunder dull or causes quiet rain to disappear.
Make a test recording before unattended streaming
Record a representative section in OBS after setting levels and filters. Include the loudest known thunder and some quieter rain before and after it. Stop the recording and listen back rather than judging only from the live mixer: monitoring and meters are helpful, but the delivered file is the practical check on what your setup produced.
Listen for crackle on the initial strike, harshness through the rumble, a flattened transient, or a noticeable change in rain level after the thunder. If you hear distortion, go back to the earliest checkpoint where it is present. If it is clean at the source but not in the recording, inspect the OBS chain and output level rather than adding more limiting blindly.
Keep a short test recording whenever you change the loop, audio source, gain staging, filter order, or routing. A file that played cleanly on one computer or through one interface does not prove a different route will behave the same way. Likewise, a test made from a quiet section does not tell you how the largest thunder peak will pass through the chain.
Only leave the stream unattended after the loud passage has been checked at the source, through OBS, and in a recording. This is a listening check, not a promise that future files, settings changes or equipment changes will behave identically. If you rotate several storm tracks, audition the loudest passage in each one rather than assuming the first track represents the rest. For channels built around changing media, the guide to automating episode rotation on a YouTube live stream covers rotation mechanics, while each new audio source still needs its own level check.
For an always-on channel, a dropped broadcast and a distorted mix are different faults. StreamNeo can remove the need to keep a personal computer running the uploaded video, but you still need to prepare and check the audio file and stream key before leaving the channel unattended. If your concern is what YouTube receives from the encoder rather than the sound itself, the overview of sending a live stream to YouTube explains that separate path.
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FAQ
Can an OBS limiter fix thunder that is already distorted?
No. A limiter can control peaks that reach it, but it cannot restore audio already distorted in the file, player, interface, mixer or another upstream stage. Find and reduce the level at the first point where the sound becomes rough, then test again.
What limiter threshold should I use for rain and thunder?
There is no guaranteed threshold for every recording or signal chain. OBS documents -6 dB as its default threshold, which is a reasonable starting point for listening tests, not a universal target. Replay the loudest passage and assess the sound in a recording.
Should I add a compressor as well as a limiter?
Only if you need to control broader loudness variation after correcting the gain staging. Compression can reduce thunder dynamics if applied too aggressively, so compare the result with the compressor bypassed and keep the limiter last in the filter chain.
Is the OBS meter enough to confirm the stream sounds clean?
No. It helps you see peaks, but it cannot reveal every audible problem or prove that an upstream source is clean. Monitor the loudest thunder before OBS and through OBS, then listen to a representative recording.