u/ajgnet

Hi everyone,

I’m hoping to get some advice from the experts here. I live in a new construction apartment building, and my unit is two floors directly below the elevator machine room. When the elevator is running, I hear a low-frequency hum that resonates through my apartment. It doesn't happen the entire time the car is moving, but seems to peak at specific points during the trip.

I used a spectrum analyzer app on my phone (I know it's not professional equipment, but it gives a baseline!) and it's picking up a distinct tone in the 1/3 octave center band at roughly 50 Hz. It definitely feels and sounds like a structural vibration traveling down the building.

I did some digging and found out the machine is a ThyssenKrupp DAB 530. I also managed to find a photo of our actual machine room, which I’ve attached below. Since building management is generally pretty dismissive, I wanted to gather some specific things to ask them to look into so I can be as helpful and precise as possible.

I read through the DAB 530 manual, and it mentions that to comply with regulations for noise abatement and sound transmission, insulation elements must be inserted between the frame supports and the ground. The manual states these should be rubber blocks measuring 100x100x50 mm. Looking at the photo of our setup, the pads under the frame legs look like multiple thin, ribbed layers stacked together rather than solid 50mm blocks.

My questions for you all:

Do those isolation pads look correct or sufficient for this type of machine base frame?
Is a 50Hz structural vibration common with the DAB 530, and if so, what typically causes it (e.g., motor drive tuning, brake drag, bad bearings, or just improper isolation)?
How can I best approach my building management to suggest they have their elevator contractor investigate this without sounding like a crazy tenant?

Thank you so much for your time and expertise. I really appreciate any insights you can share!

I know everyone here is complaining about the price tag of putting a UDM Beast in a residential rack. Yes, it is quite expensive, but honestly, that is just the reality of current compute costs and inflation. If you want real performance, you have to pay for the hardware.

People keep quoting the 25 Gbps IDS/IPS throughput and laughing at how unnecessary it is. What you have to realize is that spec sheet rating assumes you are running strictly the network application with zero other services enabled. It's a theoretical maximum in a vacuum.

Down here in Florida, 10G residential fiber is already here (that's 20Gbps full duplex). If you take that 10G connection and add a standard homelab loadout of a handful of access points, a few 4K cameras recording in Protect, UniFi Access, and UniFi Talk, that processing power gets eaten up fast.

With full IDS/IPS turned on to inspect that 10G pipe, the UDM Beast actually sits at about 60 to 70 percent overall capacity. In the networking world, running your gateway at 70 percent under normal load isn't overkill, that is just what we call proper capacity planning.

It is the perfect tool for the job.

Humble resident asking for advice: 50Hz structural hum from a TK DAB 530 two floors up. Do these isolation pads look right?