Low pass filtering causing high pitch ringing sound

I was trying to get lower frequency noise by using low pass filtering to get low frequency sound.

I added the default brown noise.
I used Low Pass Filter set at 70Hz, and used roll-off 48 dB.

It works and I get a nice low frequency noise but I get this terrible ringing noise.

I am trying to get some really deep/low white noise to help me sleep. And a lot of the other sounds I have found have a similar problem when I crank up the volume.

Any help would be greatly appreciated.

There is no high pitched ringing noise there, just a click at the beginning and low frequency noise. The low frequency noise goes down ridiculously low for normal loudspeakers, or even for professional subs. Perhaps you can hear your speakers rattling or the ports blowing.

Thanks for the reply!

I am currently using Bose QC 35 II headphones, and if I turn the volume up I can hear a ringing sound.

If the volume is low I dont hear it and just hear the low frequency sound which is good. But Id like to listen to it louder.
I dont have this problem with other sound like just music at loud levels.

And now that you mention it, if I use speakers I dont have the ringing noise. But on multiple Headphones I do.

Im not familiar with sound tech, so any explanation would help a bunch.

I think I found out the problem.

It seems my playback devices cant hand the very low frequency sound at high volumes. If I do High pass filter and set at around 150hz I can get rid minimize the ringing noise.

If anyone can confirm or elaborate that would be great.

Im not familiar with sound tech, so any explanation would help a bunch.

Sounds that are too low in frequency for your speakers to reproduce, or too-low for your ears to hear can result in distortion and/or noise that you can hear. Or even if you can hear the low-frequencies, these very-low frequencies are harder to reproduce and harder to hear than mid-frequency sounds so you can drive your amplifier/speakers/headphones into distortion without it sounding that loud.

“Artificial” high-power high-frequency tones can cause similar issues and either one can also end-up burning-out speakers if you have a high-power amplifier. (You are less likely to burn-out headphones).

You might try a high-pass filter at 20 or 30 Hz. The lower frequencies are just likely causing trouble. (20Hz is the theoretical or “traditional” lower hearing limit and the lowest note on a standard bass guitar is about 40Hz.) But even these frequencies are “difficult” to reproduce and your ears are not as sensitive near the limits of hearing. In the “real world” these very low frequencies are felt in the body as much as they are heard with the ears so headphones don’t give you the same experience. And of course, with speakers it takes big woofers/subwoofers and big amplifiers to properly reproduce that kind of deep-bass that you can feel.

I am trying to get some really deep/low white noise to help me sleep.

FYI - It’s no longer white noise once it’s filtered/altered. :wink: People often use white noise or pink noise or “natural” sounds like waves, rain, or a fountain to help them sleep and/or to drown-out unwanted noise. Hmmm… All of those are related to water… I guess wind noise is disturbing rather than relaxing.

@DVDdoug Thanks a bunch man!

Bose QC 35 II headphones

Those are wireless, right? Does it happen with wired headphones? Wireless has an extra layer of technology between you and the computer.


Thanks for the reply.

Yea they are wireless.

DVDdoug hit the nail on the head for my problem.

Once I did the high pass filter at a certain point it stopped the ringing. But I don’t have as much rumble haha, guess Ill need to get better headphones one day.