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7 votes

Why early films had crackling noises in background?

I'd be inclined to think it would be from scratches/dust in the optical medium that sound was carried on in cinema film, up until 1976. See this image from Wikipedia… Edge of a 35mm film print ...
  • 7,762
6 votes

Why do some audio amps use AC while others use DC

Is AC current fundamentally better as a working current when it comes to amplifying audio signal? No. If anything, using an AC power supply makes it more difficult to have low noise. The circuits ...
  • 1,568
5 votes

Can noise be reduced by 7 decibels with a curtain?

They missed out one vital piece of information - at what frequencies? They'd need to be made of lead to stop anything below 100Hz… I wonder whether their mosquito-repellant curtains work when they'...
  • 7,762
5 votes

How can I make a voice in the background come to the foreground and remove foreground noise?

Short, honest answer: nope, forget it. In principle it's possible nowadays to separate any part of a signal, using software like iZotope RX or the (rather dated, by now) Algorithmix Renovator. These ...
5 votes
Accepted

Why do some audio amps use AC while others use DC

The type of current is actually completely irrelevant as all transmitted power is AC. Unless you are driving your amplifier from batteries, everything has to be converted at some point to DC. The end ...
  • 8,695
4 votes

Reducing noise and crackling from wires

Balancing! All your lines should be balanced. What this does it splits the signal in two and flips one half of it. Then the side that is flipped is flipped back at the end, and added to the first one, ...
4 votes

Do XLR cables wear out?

Yes, they do wear out eventually. As pointed out already, the life time depends greatly on use and quality. Even with a cable that seemingly works sound quality may get drastically reduced. See below. ...
4 votes

How to remove repetitive (air compressor) noise from audio?

Izotope rx is the industry standard. But any fingerprint style noise reduction should be able to improve it.
  • 1,304
4 votes
Accepted

Faking depth and stereo separation?

It depends on what you mean by “cleaner” really. Is this a professional or amateur recording? If you just want to improve the recording, then there are many things you can try. EQing to get a better ...
  • 2,441
4 votes

Isolate a subwoofer from the floor below

How much money have you got to spend & would you consider replacing the floor entirely with a new one made of solid concrete, not connected to the current walls or floor? That is not as frivolous ...
  • 7,762
3 votes
Accepted

I just got a Blue Snowball Ice and it picks up my keyboard with Cherry Mx Blues

Aren't Cherry MX Blues practically designed to be loud? I heard once that DasKeyboard used to offer ear plugs as an accessory (as a joke)... I love my mechanical keyboards, but I use MX Browns any ...
  • 1,587
3 votes

How to fix loud thunderous noise from Peavey PA system?

This is most likely an issue related to microphone cable, connectors or wireless receiver. Try the following to determine the source of the error: Test amplifier Connect amp and speakers only - NO ...
3 votes

Remove hiss from audio

To fully discard the option of the method you tried make sure that before you invert the phase of the left channel you bring both channels to the center field; then you invert the phase and judge if ...
3 votes

Why is there noise in my spectrum analyser despite having no external devices plugged in?

All audio electronics create noise, including your interface itself. It's actually pretty good that the self noise of the interface is at around -100 dB. Even when all other sources of noise are ...
  • 2,110
3 votes

Noise in usb audio interface?

This could be a variety of things but there are a few things you can do to trouble shoot. Ensure that everything is plugged into the same outlet. In some cases crossed grounding can cause buzzing if ...
  • 1,010
3 votes

Why am I hearing weird static nosie on my speakers

I have figured out the problem. We had a netgear wifi router connected to the mixer. It is supposed to enable wireless connectivity to our mixer. If I turned that off, the mic signal doesnt drop and ...
  • 151
3 votes

What is the best way to reduce background noise on a video recorded with a camcorder (background chatter)?

There are automated algorithms like those you tried in iMovie, the ones in Audacity might be worth a try but if you want better results you should individually edit phrases. Software like izotope RX ...
  • 844
3 votes
Accepted

Denoising studio induced noise and noise due to poor recording

Firstly, do any and all processing in WAV files. If your source material is on CD, then rip to 44.1kHz/16bit WAV and process at 24-bit in your software. Do not transcode via mp3. Tracks like 104b ...
  • 8,695
3 votes

Is it possible to remove a whistle-like noise from audio?

A very High-Q notch EQ filter can do the trick, although I would probably recommend spectral cleaning to nail this. Izotope RX Advanced Spectral Cleaner is the way to go.
  • 8,695
3 votes
Accepted

Does DC translate to sound?

Sound is derived from vibrations which in turn are generated or represented by changing current levels. Sound can never be derived from a static voltage or current. Your statement that "DC should ...
  • 8,695
3 votes
Accepted

What is causing the 5.5 kHz noise in my recording setup

This is a broad sweep at the issue, some guesswork & experimentation required. First of all, if you have an alternative DAC try it, no matter how basic, just to eliminate the simplest explanation....
  • 7,762
3 votes

Background Noise Removal in Audacity 3.0.2

As you've not uploaded a sample, I can't say for sure, but the first step should be trying to understand where exactly the noise is. To do this, you can use spectrogram view that shows your audio file ...
3 votes

Background Noise Removal in Audacity 3.0.2

If you have a podcast file consisting only of human voices, you owe it to your future self to check out some AI-powered audio tools for cleanup. I've done the “conventional” ways, including the ...
  • 439
2 votes

Fix for terrible "Hard Drive Noise" Audio Interference?

Have you considered investing in a power conditioner? They are used in most studios and also live venues. It's basically like a rack mounted power bar, but it does so much more than just basic surge ...
  • 465
2 votes

USB input high-pitched whine

I have the exact same interface and was hearing the exact same noise, except it was not there when I bought the interface. It does seem to be a power-supply-related problem, turns out the noise only ...
2 votes

Add white noise to silence

I'd be more inclined to remove the white noise from the speech than try add it back in the silence. There are some very good paid plugins that can do it - personally I use a lot of the Waves plugs, X-...
  • 7,762
2 votes

Modding a Zoom H5 and its Shotgun Mic: possible?

If you need quiet sounds like subtle atmos you need to get a better recorder that has better converters. Good converters with low noise cost. The zooms are really only good for loud stuff, originally ...
2 votes

Who makes the quietest microphone?!

https://www.lewitt-audio.com/microphones/lct-recording/lct-540-subzero The Lewitt LCT540 has the quietest specs I've seen available in a commercial mic.
2 votes
Accepted

Low ambient noise in silent sections

The Izotope RX denoiser would probably be what you would want to use. I don't think you want to remove the room noise entirely but just reduce it so that it still sounds natural and you still hear ...
  • 1,304
2 votes
Accepted

Add white noise to silence

What is best to do if you record something specific is also record the room 'silent', so than you get the environment sound of the subject your recording. Add these layers together and you'll get your ...
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