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Reducing Humming Sound

Hello all!

I am using a Tripp-Lite LCR2400 AC line conditioner in my system.  I am very happy with it and the peace of mind it offers me with regards to not only protecting my equipment, but insuring the power I'm getting is clean and stable.

This unit is known to have an audible hum to it...it's not very loud, but it can be heard faintly in a quiet room. When playing music, the hum is not noticeable at all.

If I were to attempt to reduce this hum, would opening the unit up and affixing sound deadening material (like Dynamat) to the interior of the case/chasis/cover be a good solution?  Normally, I would go ahead and give this a try, but since there is such a high level of electricity being handled by this unit, I don't want to do anything that would be dangerous once I plug it in and turn it back on.

Thanks for any feedback,

Arvin
128x128arvincastro
oldhvymec
5,101 posts
 
Ok I took it apart.  I'm gonna put a better conductor in the box and hard wire mine in with a shorter cable and a pure copper end.  It has some very small caps inside on a logic board. NO problem with having to discharge ANYTHING....
The transformer has 4 corners, two are secured through the faceplate via the front handle and two are secured directly to the faceplate.  NO vibrational dampening of any type. 
Silicone is the best. Make sure it's NOT for ultra high temp. They use nickel, lead, or tin ALL conductive in some of the cocktails with silicone to get the temp rating HIGHER.
Clear silicone is fine temp wise.   I'm gonna look for silicone washers to go between the two mating surfaces. Fireproof dampening stick on stuff, or I'll just run beads of silicone the length of the enclosure let it set up. Thin bead of silicone on the mating surfaces and put it back together.

I used a thermal gun BEFORE the upgrade after an hour of running 85 degrees, room temp was 70.  We'll see if there is any change temp wise, after the silicone.

It is just a noisy enclosure. Should be easy to fix...

Regards
arvincastro's avatar
arvincastro OP
121 posts
 
@oldhvymec

Thanks for the report and I am very happy to hear it wasn't too trying a chore for you!  I actually sent your findings to a friend of mine who happens to be an electrician and he said it looks pretty straight-forward...we're hoping to meet up sometime after this COVID-19 business allows us to try silencing the enclosure as you've stated.

Thanks again...Hope you and yours are well!

Arvin 
oldhvymec
5,101 posts
 
I took it apart and just used silicone, about a half a tube. I checkerboarded the inside and gave it a little smear. I didn't remove the transformer, I just put a good amount around, the mounts. I also wiped a thin layer on one side of the mating surfaces. Next day back together, about half the noise. I cut two pieces of  in/outdoor carpet close to the same size, one top one bottom, and placed an active XO on top. Pretty quiet now. About 1/2 again. I think with a stick on sound killer, 80% of the noise will be gone.  I'm at about 60% with the carpet..and silicone..

Regards
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