I also have an issue with noise, but on a NVR5432-4KS2 this is not POE but does have an internal, noisy power suplly fan. I thought we might be better able to problem solve the issue together...
Noisy Dahua NVR5432-4KS2 Sound proofing ideas, Fan upgrade, Reduce fan speed
Thanks. I have not read through that thread yet. I scanned it.
I'll read through it more carefully in a few days.
Just used my iPhone with "Decibel X" app. I'm sure it's not perfect but it's good enough for what I needed.
The room I tested in was pretty quiet, ambient sound was 40-41dB. Which is considered a "quiet room". I just measured from directly in front of the NVR @ 6", 2' and 6'. There was minimal other equipment around reducing echoing affect off other devices and walls. There was a laptop (with fan running) about 10 ft away. It was far from scientific but the numbers gave me what I needed as a baseline if I decide to go about swapping fans in the future. Just know that the dB readings published for fans has little to do with their final dB reading once installed in a piece of equipment. You can use the published readings for fans to compare them to each other, but the final noise levels once installed will be significantly different.
You can also see my noise readings above from 6' away using the "Self-adaptation" fan setting was 40.0dB. This was the same as I was getting from the ambient room itself with the NVR off. This means, from my observation, at 6' or greater the NVR was indistinguishable from the ambient room noise itself. Again keep in mind the case fan speed at the time was approximately 3700RPM, due to a combination of factors - one being only one POE camera attached and another being the ambient room temp was a pretty low 72F.
Fans are rated/tested outside of any case, so as soon as you mount them in something their decibel ratings are going to go up. In some cases they will go up significantly.
I'm pretty sure the web interface does not yet have access to fan settings in it.
Thanks. I'll try Decibel X and report my findings.
When you said ambient sound was 40 - 41 dB, was that before or after powering on the NVR?
I'm a little disappointed that I couldn't find a good way to use my digital audio recorder to measure the dB levels. I mean, I look at the dB levels when I'm actually recording something, and it's helpful then.
Part of the issue was that I couldn't find a way to place it near the NVR, but still read the levels. I guess I could actually record the noise, then play it back to see what the levels were.
But something about the physical logistics of this was giving me trouble.
There's a chance I have the same problem with the phone app. I guess we'll see.
It might take me a few days, but I'll definitely try this and report back.
Actually, now I think I know what the problem is. I think I'm not reading the levels properly on the recorder. The lowest level I see is -48dB. But the manufacturer specs say that the recorder is rated up to 120 dB. So going from the lowest level, at -48, to the highest, at 0, corresponds to 120 dB. I think I have to convert -48 to 0 into a 120 dB scale or something.
So when I said earlier that I couldn't find a good way to use the digital recorder, what I mean is that I tried it, but the levels seemed too low. The numbers weren't making sense.
But now that I think about it, I think I have to convert it to another scale or range, for it to make sense.
