Sound Blocking for Noisy Gear in a Cabinet? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 8 Old 06-23-2019, 05:30 PM - Thread Starter
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Sound Blocking for Noisy Gear in a Cabinet?

I posted this in one of the Home Theater forum, but haven't received any answers on this yet. Since this is a DIY section, I figured you all might have some suggestions.

I recently added some Luma Security cameras and a Luma NVR to my home, as part of an overall home automation project, and the logistics were such that I had to place the NVR in my Theater Room, in a cabinet housing some of my other AV gear. The problem is the NVR's fan is unexpectedly quite noisy, with no apparent means of directly lessening it.

I'm attaching a photo to show it, in the 2nd slot from the top.

I'm thinking of using some type of sound-blocking foam or other material, placed in the front and sides of this slot (leaving the back open) to at least reduce the noise significantly. The unit actually runs quite cool, so I'm not concerned about heat build-up. In fact, given how cool it is, I wonder why they seem to have maxed out the fan!

I've looked at egg-crate type sound insulation, MLV sheets, etc., but I'm not sure what would work best. I would just need to cut pieces to form a "u-shaped" barrier around the device, occupying the full vertical space of the slot.

Any suggestions or ideas?

Thanks!
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post #2 of 8 Old 06-24-2019, 12:23 AM
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Open cell foam with a type of backer to it would work well.


Or replace the fans with a quiet PC type fan.
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post #3 of 8 Old 06-24-2019, 04:22 AM - Thread Starter
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Quote:
Originally Posted by Trimlock View Post
Open cell foam with a type of backer to it would work well.

Or replace the fans with a quiet PC type fan.
Thanks for the reply.

Regarding the fans: I actually have replaced the fans in my iNuke 6000 for the same reason. But this is a brand-new product, and I'm sure doing this would likely void the warranty should I have any type of issues with the device down the road. So I'd prefer to avoid that in this situation.

Can you link to a specific foam product you're thinking of for use in this situation? A search shows a variety of spray options for "open cell foam" and a few strips of varying width. None of these seemed to specifically address sound insulation. And I'm not sure what you mean by a "backer" - could you elaborate? And what thickness would be appropriate?

Thanks again.

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post #4 of 8 Old 06-24-2019, 04:58 AM
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In the past I've used this to line the inside of my computer cases. You could paint a thin piece of wood black (on the outside) and then mount this on the inside to make your "tunnel" as it were...



More options here

If the item were bigger I'd suggest putting some dynamat inside the case, but doubt there is any extra room. And given its aluminum color, I'd suggest against using it to line the inside of the tunnel your building around that one rack section lol....
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post #5 of 8 Old 06-24-2019, 06:12 AM - Thread Starter
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Quote:
Originally Posted by EndersShadow View Post
In the past I've used this to line the inside of my computer cases. You could paint a thin piece of wood black (on the outside) and then mount this on the inside to make your "tunnel" as it were...

More options here

If the item were bigger I'd suggest putting some dynamat inside the case, but doubt there is any extra room. And given its aluminum color, I'd suggest against using it to line the inside of the tunnel your building around that one rack section lol....
This looks like an excellent option - thanks!

If the material holds it's shape enough, I might not even need that wood. Just cut 3 pieces to insert in-between the posts to fill the space. It looks like it's black, or close to it, and since the rack is off to the side, and everything in it is black, I doubt it'll call too much attention to itself.

Much appreciated!

JVC RS400, Marantz SR7010, Screen Innovations 160" 2.35:1 Screen
Front L/R: Duntech Sovereigns, powered by 2 bridged Adcom GFA-555
Center: Revel C208 powered by Cambridge Audio Azur 851W
Dolby Bed (4): Sony Core SS-CS5, Atmos (4): Ascend Acoustics CBM-170 SE
Subwoofer: DIY 8' sub with 4 18" SI Drivers, powered by iNuke 6000
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post #6 of 8 Old 06-24-2019, 10:18 AM
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Quote:
Originally Posted by DLCPhoto View Post
Thanks for the reply.



Regarding the fans: I actually have replaced the fans in my iNuke 6000 for the same reason. But this is a brand-new product, and I'm sure doing this would likely void the warranty should I have any type of issues with the device down the road. So I'd prefer to avoid that in this situation.



Can you link to a specific foam product you're thinking of for use in this situation? A search shows a variety of spray options for "open cell foam" and a few strips of varying width. None of these seemed to specifically address sound insulation. And I'm not sure what you mean by a "backer" - could you elaborate? And what thickness would be appropriate?



Thanks again.


Apart from what was posted above me there are a bunch of options on amazon. The backer is any material on one side, usually for insulation, paper, foil ... wood. Acts an additional barrier to deaden the sound passing through, makes the noise blocking more effective. Figured it would look better than just foam too.


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post #7 of 8 Old 06-24-2019, 11:07 AM
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Quote:
Originally Posted by DLCPhoto View Post
This looks like an excellent option - thanks!

If the material holds it's shape enough, I might not even need that wood. Just cut 3 pieces to insert in-between the posts to fill the space. It looks like it's black, or close to it, and since the rack is off to the side, and everything in it is black, I doubt it'll call too much attention to itself.

Much appreciated!
Yeah, it will hold its shape on its own, however the backer pieces is more of a white than black, so you'd want to likely do something to that.

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post #8 of 8 Old 06-24-2019, 04:49 PM - Thread Starter
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Quote:
Originally Posted by Trimlock View Post
Apart from what was posted above me there are a bunch of options on amazon. The backer is any material on one side, usually for insulation, paper, foil ... wood. Acts an additional barrier to deaden the sound passing through, makes the noise blocking more effective. Figured it would look better than just foam too.


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Quote:
Originally Posted by EndersShadow View Post
Yeah, it will hold its shape on its own, however the backer pieces is more of a white than black, so you'd want to likely do something to that.
Thanks guys. I'll be ordering this for the job. I can always use some of the extra black velvet that I've used to treat areas around my screen, and on other surfaces around the room to reduce reflection of light back on the screen.

JVC RS400, Marantz SR7010, Screen Innovations 160" 2.35:1 Screen
Front L/R: Duntech Sovereigns, powered by 2 bridged Adcom GFA-555
Center: Revel C208 powered by Cambridge Audio Azur 851W
Dolby Bed (4): Sony Core SS-CS5, Atmos (4): Ascend Acoustics CBM-170 SE
Subwoofer: DIY 8' sub with 4 18" SI Drivers, powered by iNuke 6000
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