A buzzing live stream is a symptom, not a diagnosis. First identify whether you are hearing steady hum, crackle, feedback, clipping or a digital glitch; then trace the sound through the audio chain before changing equipment.
Compare what you hear locally with what reaches the stream, and isolate one component at a time. This is a practical way to narrow down the cause, not a test that guarantees a particular result.
Identify the Type of Buzz or Noise
Listen for the character of the sound before adjusting levels or buying anything. A low, steady hum or buzz can point towards electrical interference or a ground path. A crackle that comes and goes may be associated with a loose connector or cable, though the sound alone cannot confirm that. Shure’s audio troubleshooting guide describes low buzz and intermittent crackle as symptoms that can indicate an electrical problem, including a loose ground near a connector.
Feedback is different: it is usually a sustained ringing tone that builds when sound from a loudspeaker re-enters a microphone and is amplified again. If the tone changes when you move the microphone or turn down a nearby speaker, feedback is more plausible than a ground hum. Shure explains the feedback loop and ways to control it.
Clipping tends to sound harsh, flattened or distorted on louder words or musical peaks. It is more likely when the input or output level is too high than when a cable is picking up hum. A digital glitch may sound like clicks, brief dropouts or broken audio, and can coincide with computer activity or an interface connection issue. Focusrite notes that some glitches can track mouse movement or hard-disk activity in its guide to unwanted noise.
Write down what you hear and when it occurs. Does it continue when the microphone is muted? Does it appear only when a light is dimmed, a phone is charging, or a particular instrument is connected? Does it get louder as the source level rises, or does it cut in and out? These observations are more useful than treating every unwanted sound as “buzz”.
Avoid making several changes at once. If you move a cable, change a gain setting and replace an input device together, a quieter result will not tell you which change mattered. Make one change, listen again, and note the result.
Compare Local Audio with Stream Output
Check the same source at more than one point: direct headphone monitoring if available, a short local recording, and the stream output. Listen to the local recording after it has finished, rather than relying only on what you hear while speaking. The aim is to establish where in your setup the noise becomes audible; the comparison is a troubleshooting inference, not a universal or source-proven test.
If the noise is already present in direct monitoring, start with the microphone or instrument, its cable, the interface or mixer, and any electrical connections. If a local recording is clean but the stream has noise, inspect software routing, selected devices, duplicate sources and monitoring settings first. A recording can take a different path from the live output, so confirm what it actually captured before drawing conclusions.
For a 24/7 channel, arrange a brief test during a quiet period or use a private or unlisted test stream where appropriate. Check the platform’s current guidance on visibility and live-stream setup rather than assuming a test has no audience. Keep the test short and listen at a sensible volume; a feedback tone can be unpleasant and potentially damaging at high levels.
When the symptom is tied to a setup change, compare like with like. For instance, record a few seconds with a microphone connected directly to the interface, then repeat after adding a mixer or another device. Mute or disconnect one non-essential source at a time. If the noise vanishes when a particular connection is removed, reconnect it once to see whether the symptom returns. This narrows the search without proving that the disconnected device is faulty; it may be the interaction between devices or their power paths.
A useful troubleshooting note can be simple: “buzz in headphones and recording, stops when keyboard cable is removed” or “clean local recording, noisy stream only”. That gives you a concrete next step and avoids replacing equipment based on guesswork. If you are planning a continuous broadcast as well as fixing audio, the setup considerations in streaming a pre-recorded video on repeat are a separate part of keeping a channel running; they do not replace checking the audio signal itself.
Check the Microphone, Instrument, and Cable
Start at the source. Reseat the microphone or instrument connection at both ends, checking that plugs are fully inserted and that connectors do not move loosely in their sockets. Inspect the cable along its length for visible damage, sharp bends or strain at the plug. If the noise changes when a connector is touched or a cable is moved, that is a reason to test the connection, not proof that the cable alone is responsible.
Temporarily substitute a known-good cable that matches the source and input. For a balanced microphone connection, use a balanced XLR cable between equipment that supports balanced connections. Balanced wiring is useful for reducing susceptibility to noise picked up along a cable run, but it cannot fix every hum, bad input, software route or power problem. Shure’s guidance about balanced cable applies specifically to interference picked up by unbalanced cable near electrical sources.
Cable placement matters too. Keep unbalanced audio leads away from lighting, dimmers, mains power leads and loudspeaker cables where practical. Cross power and audio cables at an angle rather than laying them alongside one another for a long distance. Re-route the cable temporarily and listen again before buying accessories. A small change in placement can help identify whether the run is part of the problem.
If the source is an unbalanced instrument, such as an electric guitar, a DI box may be a suitable trial because it can provide a balanced connection to an appropriate interface or mixer. Some DI boxes include a ground-lift switch; use it only as intended for that signal path and follow the device instructions. A DI box is not a general microphone hum filter, and the switch will not address unrelated clipping, feedback or software routing.
A ground-loop isolator may help with a compatible connection where the noise follows interconnected devices and their ground paths. Connector type and signal level matter, so check compatibility before inserting one. Do not remove protective mains earth connections or use an unsafe adapter to stop hum. If you suspect a mains wiring issue, stop experimenting with power connections and ask a qualified electrician to assess it.
Inspect the Interface, Mixer, and Computer
Once the source and cable have been checked, look at the next device in the chain. Confirm that the interface or mixer input matches the source type and that gain is not set so high that normal peaks distort. If the problem is clipping, reduce the relevant input gain and make a new recording; do not expect a cable swap to correct overloaded levels. If it is a steady hum, test with non-essential connected devices muted or disconnected one at a time.
Computer and interface connections deserve their own check. Reseat the USB connection and test a compatible cable specified for the interface. Check that the interface is supported by the operating system and that its current manufacturer-provided software and drivers are installed. Focusrite’s USB interface connection and performance guidance recommends checking compatibility and interface software when resolving connection or performance problems.
A bus-powered interface can be affected by the computer’s USB power or by the devices sharing that connection. If the noise seems to follow the computer, test the interface on another compatible computer or at another location if available. Simplify the USB setup and compare results. A powered USB hub may be worth considering only where the manufacturer supports that arrangement and power is a plausible factor; it is not a guaranteed fix for ground-related noise.
If you can, compare the same audio setup in a different room or building. A noise that changes with location may point towards the electrical environment, but it does not identify the exact cause by itself. Focusrite suggests changing computer or location as a way to help isolate a noise source. Keep the setup otherwise as similar as possible so the comparison remains useful.
For clicks, stutters or dropouts rather than steady hum, check system load, interface drivers and software performance. Focusrite’s Windows audio guidance suggests trying a buffer size of 1024 for glitchy audio in relevant setups. That is a troubleshooting setting, not a universal value and not a repair for a ground loop. Changing the buffer can affect latency, so test whether the result suits your monitoring and recording needs before leaving it in place.
Check OBS Inputs and Monitoring
In OBS, confirm that the intended microphone or interface is selected. An Audio Input Capture source can be set to the appropriate device; for a single microphone on a mono input, check that the source is configured to use the mono signal where required. Focusrite’s OBS setup guide covers adding an Audio Input Capture source and selecting an interface input.
Check for duplicate capture. The same microphone may be present as a global audio device and as a scene source, or may be captured through an unintended desktop source. Mute one source at a time and listen to a recording or test output. If muting a duplicate removes an echo, comb-like sound or level change, simplify the routing rather than compensating with more filters.
Monitoring can make a problem sound different from the stream. Confirm which device you are listening through and whether OBS monitoring is enabled for the source. Avoid routing monitored audio back into a capture input, which can create a loop. If only the stream path sounds wrong, inspect the source selected in OBS and the path from that source to the programme output before changing microphone hardware.
Keep levels consistent while testing. A filter or gain adjustment may make a buzz less noticeable by making everything quieter, but it may also lower the wanted voice or music. Listen to the noise between phrases and to the source at a normal working level. If you use a noise gate, remember that it can hide quiet noise when the source is silent while leaving the underlying hum present during speech or music.
If OBS is part of a wider continuous-stream setup, it may help to review the OBS settings for pre-recorded YouTube streams, while keeping in mind that encoding settings and audio fault diagnosis are different tasks. For a simpler software workflow, the trade-offs described in browser versus desktop streaming software may help you decide where audio routing takes place; whichever route you use, verify the actual input feeding the broadcast.
Reduce Electrical Noise and Retest
After locating the likely part of the chain, make a controlled change and repeat the same listening check. If an unbalanced lead runs near a dimmer or power cable, reroute it and compare. If the noise follows a connector, test a compatible known-good cable. If it follows one device’s connection to another, simplify the setup and assess whether a compatible isolator or DI box is appropriate. Each option addresses a different possibility; none is a universal cure.
| Possible trial | Most relevant when | Check before trying |
|---|---|---|
| Balanced XLR cable | A supported balanced microphone path is picking up interference along a run | Both connected devices and the cable must support the balanced connection |
| DI box with ground lift | An unbalanced instrument or source is connected to an interface or mixer | Match the source, input and signal path; follow the DI box instructions |
| Ground-loop isolator | Hum appears to follow a compatible connection between devices | Confirm connector and signal compatibility; do not defeat mains safety earth |
| Compatible USB cable | Interface noise or dropouts change when the computer connection is disturbed | Use a cable suitable for the interface and test one change at a time |
Retest with the same source, gain, software scene and listening point. Note whether the sound is gone, reduced, unchanged or different. “Reduced” is not the same as solved: if the sound remains, continue along the chain rather than stacking filters or buying several accessories at once. If a change makes the noise worse, restore the previous arrangement before trying another.
When a 24/7 channel depends on a computer remaining on, a separate source of trouble is keeping that machine running and recovering after a drop. StreamNeo can remove that particular burden by turning an uploaded video into a YouTube live stream without keeping your own computer on; it does not diagnose or repair noise in a microphone or recording. If the audio is already baked into a video, check the file itself before sending it to any broadcast workflow.
Keep a clean reference recording of the corrected setup, and document which inputs, cables and software sources were in use. If the problem returns overnight, the record helps distinguish a changed connection or device from an intermittent symptom. Where noise persists across different sources and connections, seek advice from the interface or microphone manufacturer, or a qualified audio technician; for suspected mains faults, use a qualified electrician.
Before committing, compare the operating options on the pricing page. When the file and channel are ready, start free — 24-hour trial, no card.
FAQ
Is buzzing always caused by a ground loop?
No. Hum can be associated with ground paths, but crackle, feedback, clipping and digital glitches have different possible causes. Compare where the noise appears and change one connection or setting at a time before choosing a remedy.
Will a new cable fix buzzing in my live stream?
It may help if the cable is damaged, poorly connected or picking up interference in a susceptible run. A balanced cable is relevant only when the equipment supports a balanced path, and it will not resolve every software, power or gain issue.
Should I use a ground lift or remove the earth connection?
A ground-lift switch on a suitable DI box may help with a compatible unbalanced instrument path. Never remove protective mains earth to address noise; if you suspect a mains wiring problem, have a qualified electrician check it.
Why is my local recording clean but the stream noisy?
The recording and stream may use different inputs, sources or monitoring routes. Check the selected OBS device, duplicate captures and the path feeding the live output, then make another short test rather than assuming the microphone itself is at fault.