Pumps could put vibrations into the ground which propagate to the house and cause audible sound.Those usually whine. Plus we can't hear it outside.
Pumps could put vibrations into the ground which propagate to the house and cause audible sound.Those usually whine. Plus we can't hear it outside.
I should have thought of this before but after your post I put my ear to the wall (any wall) and I heard it. Then I tried the floor - even stronger. So I turned off the breaker and it was still there. It sounds like a generator under the floor but I've been under there and it's quiet.Can you feel vibration when you put your hand on a wall or floor?
Speaking of ducts, at my former workplace, we got to wondering about a small metal box which was situated high up on a wall and which looked like a desktop power supply. Turns out it was a white noise generator designed to mask the rumbling sounds of the HVAC system. It had a couple of controls which controlled pitch and amplitude of the noise.ducts
Isn't that simply because higher frequencies get absorbed more easily than low? If your neighbour plays his music too loud, you'll hear the bass more than anything else. Same idea applies to (far)higher frequencies like; while having a higher (max) bandwidth, 5GHz WiFi has a far shorter range than 2.4GHz. Also see 5G mobile internet and the need for pico and femto cells.That's normal, for whatever reasons.
Isn't that simply because higher frequencies get absorbed more easily than low?
5GHz WiFi has a far shorter range than 2.4GHz.
If you confirm that the vibration is transmitted from outside plumbing, there are plumbing vibration decouplers that may help (basically a section of flexible pipe that won't transmit vibration). However, it would involve hiring a plumber and digging up outside the house.Now I'm thinking its caused by water flowing in one of the mains in the street, vibrating the foundation. Whatever it is, it's consistent night and day.
I'm thinking that the water in the mains may be vibrating the ground and the foundation of the house. I can't think of anything else that would only make a sound in the house but not outside and that would be noisy when the power is off.If you confirm that the vibration is transmitted from outside plumbing, there are plumbing vibration decouplers that may help (basically a section of flexible pipe that won't transmit vibration). However, it would involve hiring a plumber and digging up outside the house.
I used a Dayton MM-6 mic with my phone. It got similar graphs to the minidsp umik-1 & REW but when I tried a video I just got higher frequencies. It must be the video app doesn't have low range.
No. But its a 100+ year old neighborhood. The mains have probably been replaced over time but I'm sure they are old.I would think that in most residential neighborhoods there are long periods during the day/night when no water is flowing. Any near-by water storage towers? How about sanitation plants? Any manufacturing? Any big apartments or schools?
Maybe. But I think you would hear that outside.you sure it is not a dying transformer in the transmission line in the street?
Maybe. But I think you would hear that outside.
Not if it's masked by a higher noise floor, and your earlier measurement shows there is a higher noise floor outside, as normal.Maybe. But I think you would hear that outside.
Can you detect the same vibration in the sidewalk or street? Something to determine is whether the ground around the house is vibrating or if it's transmitted into the house through something specific like plumbing. What type of foundation is it — concrete slab, concrete footings with crawlspace, full basement?I should have thought of this before but after your post I put my ear to the wall (any wall) and I heard it. Then I tried the floor - even stronger. So I turned off the breaker and it was still there. It sounds like a generator under the floor but I've been under there and it's quiet.
Now I'm thinking its caused by water flowing in one of the mains in the street, vibrating the foundation. Whatever it is, it's consistent night and day.
I have tried 3 different methods to record the hum without success. I tried my phone with a Dayton IMM-6 mic and the android video recorder, my phone and mic with a 3rd party app, and my windows 10 computer with a UMIK-1 mic and the microsoft voice recorder app. All I got was normal ,room sounds. I think the apps I used don't record low enough to pick up this rumble. Do you have a suggestion on how to record it?in order to get better graphs we should
a) look at the time domain (waterfall plot)
b) not use the record function in rew but record an audio file of 10s or so and then import it as audio data
then set the waterfall time window to max it out.
why? now we can see what noises are just noises and if there is a continuous hum it shows up as a straight peak over time.
in my case I detect no humming here (ignore SPL, not calibrated)
View attachment 117633
the "peakier" region between 35 and 55 is the nearby ocean (I dont hear it at recording time; but I can identify it on the recording)
Of course, it keeps changing.
Why not use what ever setup you used to make this?I have tried 3 different methods to record the hum without success.