Sound Deadening Part 2

[Jan Janowski]

The Velcro 3/4" dots (Stuck to floor of drive tray) made a significant improvement in sound deadening on my NAS's... but one of the locations is a bit louder than the others with same Model NAS and Same Drives, and fan settings.... and I think I know why....
The NAS are mounted in 3 different locations, each inside a different sized enclosure, each with air vents in the rear, cooler at bottom and larger exhaust at top. Temps are good... But one location is louder than the other 2 locations... I found by lifting the NAS up from the floor of the location, overall sound level falls...
What I surmise...
Just like scratching the center of a speaker cone with fingernail makes a scratching sound louder than normal, I suspect that the vibrations from the NAS's Feet on the enclosure floor is doing the same thing: The cabinet itself is acting like a speaker cone: The enclosure walls are amplifying the vibration of the NAS Feet...

So.... Because I had 4x 3/4" Vencro dots left... put a fuzzy dot on each leg of that NAS.... Will listen for it !

 

[fredbert]

I have an old neoprene-backed mouse mat that I've cut into strips and squares. Each NAS on their wooden shelf stands on a bit of this. Same goes for my office/study's old Mission speakers (not that they can be optimally placed, but hey! gotta isolate the vibrations ).

You should try putting the NAS on a Hi-Fi turntable shelf with spiked feet... often wondered if that would help, but too tight to spend money trying it.

 

[Jan Janowski]

Tonight will be ‘the test’, but it sure seems to help! On other 2 NAS’s that were quieter anyway, seeing that I have them left over, and no place to use them… put the 3/4” ‘hook pads’ on the feet of the other two…. That actually seems to help as well. Time will tell.

 

[Jan Janowski]

Yes, after one night I can say with certainty that Velcro dots on feet does reduce transmission of sounds to an enclosure.