Help me build a small sound proof box. Girlfriend's blender in the morning wakes me up. - AVS Forum
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post #1 of 35 Old 07-01-2013, 02:38 PM - Thread Starter
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I'm trying to build a small soundproof box. Say 1 foot x 1 foot.

What's best for locking out sound?

Right now I'm thinking of using 1/2" MDF to build the box and then lining it with 2 inches of fabric (burlap)?:
Quote:
Foam: Highly effective at high frequencies, and mid-range frequencies down to 500Hz. Not effective at bass frequencies.

Fabric: Broader, more even absorption across frequencies. 2-inch panels are effective down to 250Hz. 4-inch panels are effective down to 100Hz.

http://www.atsacoustics.com/blog/foam-acoustic-panels-vs-fiberglass-acoustic-panels.html

and some sorbothane on the bottom of the box for load bearing purposes.

http://www.sorbothane.com/blog/sound-damping/


If you want to know, the gf is an early bird and loves smoothies. The blender wakes me up. I'm going to build a very nice looking cabinet to store the blender in. I'll wire a button on the outside to control the blender.


UPDATE #1: INITIAL BUILD PICS at POST # 28
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post #2 of 35 Old 07-01-2013, 02:54 PM
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This seems like completely excessive over-kill. I love it. tongue.gif

Use two layers of 1/2" mdf with green glue in between. Then some type weather stripping around the door. Wouldn't put fabric in there if it's for a blender. Too hard to get any mess out of.

I made something similar out of plywood for my air compressor. Works like a charm.

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post #3 of 35 Old 07-01-2013, 03:13 PM
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Double MDF with a rubber gasket around the door should work (you could make a rubber gasket out of a bicycle inner tube). There isn't a ton of low freq coming out of the blender, so I would bother with green glue (unless you have some laying around. Find a neoprene mouse pad to place in the bottom to sit the blender on and the same for the bottom of the box. Be sure and paint the interior with a couple heavy coats of oil base paint to water proof it and silicone the inner seams. That should reduce it down to darn near silent.
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post #4 of 35 Old 07-01-2013, 03:27 PM
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Quote:
Originally Posted by BroncoSport View Post

There isn't a ton of low freq coming out of the blender, so I would bother with green glue (unless you have some laying around.

What? Green Glue isn't just for low frequencies.
You can certainly argue about the necessity of GG in blender box, but you could as well for the whole of the project. If you are going to all out, go all out.


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post #5 of 35 Old 07-01-2013, 04:35 PM - Thread Starter
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What's better?

4 layers of 1/4 MDF w/ green glue or 2 layers of 1/2" MDF with green glue?
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post #6 of 35 Old 07-01-2013, 04:35 PM - Thread Starter
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Also, you guys are awesome.

My sleep deprived sanity thanks you!
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post #7 of 35 Old 07-01-2013, 04:59 PM
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You would lose some rigidity with the 1/4". 1/2" would suffice. Also, to Bronco's point, GG wouldn't be absolutely necessary. For something this small, you could try it without. If it doesn't do enough, rebuild one with GG. Just keep in mind that GG takes a while to cure. Full performance is achieved after a couple weeks. But why not just do it.

Good luck.

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post #8 of 35 Old 07-01-2013, 05:10 PM - Thread Starter
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Quote:
Originally Posted by BllDo View Post

You would lose some rigidity with the 1/4". 1/2" would suffice. Also, to Bronco's point, GG wouldn't be absolutely necessary. For something this small, you could try it without. If it doesn't do enough, rebuild one with GG. Just keep in mind that GG takes a while to cure. Full performance is achieved after a couple weeks. But why not just do it.

Good luck.

I'm going all out. I'm even putting a maple veneer on this guy so it matches her cabinets.

I'm doing this right the first time. Besides, green glue for this project can't be all that expensive. It adds what $16.20 to the project? The Stainless steel cabinet handle to match her cabinets will be about that much.
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post #9 of 35 Old 07-01-2013, 09:39 PM
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Right on. Post a pic when you're done. I'd love to see it.

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post #10 of 35 Old 07-02-2013, 01:00 AM - Thread Starter
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Will do. It's the least I can do for all the advice you guys gave.
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post #11 of 35 Old 07-02-2013, 01:23 AM
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Isn't the best way to soundproof is to dump the girlfriend??tongue.gif
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post #12 of 35 Old 07-02-2013, 02:12 PM
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I was thinking of building a sound proof box for my wife as well. But getting her into the box might be tricky.

 

 

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post #13 of 35 Old 07-02-2013, 03:11 PM - Thread Starter
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Quote:
Originally Posted by TMcG View Post

Isn't the best way to soundproof is to dump the girlfriend??tongue.gif

She takes care of more important needs than sleep. :-)
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post #14 of 35 Old 07-02-2013, 03:24 PM
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Quote:
Originally Posted by rabident View Post

I was thinking of building a sound proof box for my wife as well. But getting her into the box might be tricky.

haha that's awesome. That's how you can check if your s/o or dog likes you more. Lock them each in a box for an hour and take note of who is glad to see you when you open the door.


Why not buy a quieter blender? The box has to be open to operate it so it kind of defeats the purpose.

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post #15 of 35 Old 07-02-2013, 04:18 PM
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Subscribed. I have a wife, a blender, a food processor, and a baby. She's making baby food in the processor all the time now so I could use the box for the middle two. Video of door open and closed while it's running please. This will make a good demonstration of damping (GG) and decoupling (rubber matting in box and under box). Your double .5" MDF should be enough mass. This should be cool... Eager to see the end product!
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post #16 of 35 Old 07-02-2013, 06:15 PM
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Move the blender into the shed. Or the basement.

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post #17 of 35 Old 07-02-2013, 06:37 PM
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Can she just make her smoothies the night before, while you're both awake?

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post #18 of 35 Old 07-03-2013, 11:35 AM - Thread Starter
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Quote:
Originally Posted by Louquid View Post

Can she just make her smoothies the night before, while you're both awake?

You can pre-crush the ice. But mixing acidic fruit and other items together the night before almost always ends up badly. Stuff coagulates.



This is actually a pretty common problem. With a quick google search and you will find hundreds of posts on this topic. For example:



http://chowhound.chow.com/topics/493160

http://katertater-roommatewoes.blogspot.com/2010/09/battle-of-fan.html

http://raw-veganism.livejournal.com/361189.html

http://askville.amazon.com/recomend-quiet-blender-make-smoothies-wake-sleeping-babies/AnswerViewer.do?requestId=68479709
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post #19 of 35 Old 07-03-2013, 11:37 AM - Thread Starter
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Quote:
Originally Posted by Awenta View Post


Why not buy a quieter blender? The box has to be open to operate it so it kind of defeats the purpose.

Sent from my SCH-I535 using Tapatalk 4 Beta

We have a nice blender. The problem is crushing ice makes lots of noise.

The door will be closed while it's operating.

Simplest trick? A powerstrip on the outside.

I plan on adding a push button relay switch once it passes the gf's sniff test.
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post #20 of 35 Old 07-03-2013, 11:43 AM - Thread Starter
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Quote:
Originally Posted by Swervepf View Post

Subscribed. I have a wife, a blender, a food processor, and a baby. She's making baby food in the processor all the time now so I could use the box for the middle two. Video of door open and closed while it's running please. This will make a good demonstration of damping (GG) and decoupling (rubber matting in box and under box). Your double .5" MDF should be enough mass. This should be cool... Eager to see the end product!

I'll do one better. I'll take actual decibel readings.
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post #21 of 35 Old 07-03-2013, 01:14 PM
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Quote:
Originally Posted by wacki View Post

You can pre-crush the ice. But mixing acidic fruit and other items together the night before almost always ends up badly. Stuff coagulates.



This is actually a pretty common problem. With a quick google search and you will find hundreds of posts on this topic. For example:



http://chowhound.chow.com/topics/493160

http://katertater-roommatewoes.blogspot.com/2010/09/battle-of-fan.html

http://raw-veganism.livejournal.com/361189.html

http://askville.amazon.com/recomend-quiet-blender-make-smoothies-wake-sleeping-babies/AnswerViewer.do?requestId=68479709

Ha. I hear ya. I've tried making protein shakes (with milk) a night before, and woke up to coagulated cheese film floating on top. Gross.

The over-engineering here is pretty awesome. Inspiring actually.

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post #22 of 35 Old 07-05-2013, 04:43 PM - Thread Starter
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Any ideas on how to do the hinges?

At this point I'm thinking a recessed door with exterior hinges but you guys probably know best.
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post #23 of 35 Old 07-05-2013, 06:21 PM - Thread Starter
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Situation is evolving.

May make the front door out of glass.

This place offers custom cut glass @ the size I need for less than $40

https://admglass.com/
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post #24 of 35 Old 07-05-2013, 06:29 PM
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Uh....why don't you just mimic any one of a number of professional products: https://www.google.com/search?q=blender+sound+enclosure&rlz=1C1CHWA_enUS513US513&oq=blender+sound+&aqs=chrome.2.57j0l3j60l2.5988j0&sourceid=chrome&ie=UTF-8

I assume you are DIY'ing because of the cost of these professional enclosures...but that doesn't mean you have to reinvent the enclosure, so-to-speak...
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post #25 of 35 Old 07-05-2013, 08:03 PM
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Quote:
Originally Posted by TMcG View Post

Uh....why don't you just mimic any one of a number of professional products: https://www.google.com/search?q=blender+sound+enclosure&rlz=1C1CHWA_enUS513US513&oq=blender+sound+&aqs=chrome.2.57j0l3j60l2.5988j0&sourceid=chrome&ie=UTF-8

I assume you are DIY'ing because of the cost of these professional enclosures...but that doesn't mean you have to reinvent the enclosure, so-to-speak...

It seems like this is more of a journey for him, rather than him wanting to get to destination.

Besides, "If it's worth doing, it's worth overdoing!" Ha.

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post #26 of 35 Old 07-05-2013, 10:26 PM - Thread Starter
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Quote:
Originally Posted by TMcG View Post

Uh....why don't you just mimic any one of a number of professional products: https://www.google.com/search?q=blender+sound+enclosure&rlz=1C1CHWA_enUS513US513&oq=blender+sound+&aqs=chrome.2.57j0l3j60l2.5988j0&sourceid=chrome&ie=UTF-8

I assume you are DIY'ing because of the cost of these professional enclosures...but that doesn't mean you have to reinvent the enclosure, so-to-speak...


Thanks for the ideas. I like the hatchback lid a lot.

I'm doing it myself because the blender is literally a foot away from my head. The kitchen is on the other side of an uninsulated wall and it jolts me awake even when I'm wearing 33 NRR earplugs. Once awake I can't go back to sleep and I feel like crap the rest of the day. I currently sleep in the guest room and it still wakes me up but not as badly. Keep in mind this is while I'm sleeping with 33 NRR earplugs. I want this thing as quiet as I can get it.
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post #27 of 35 Old 07-05-2013, 10:41 PM - Thread Starter
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Although this is really tempting:
Quote:
Omni Shield will reduce the sound over 50% in addition, bringing the noise level, measured in dB (decibels) to about 65 dB.

http://www.3blenders.com/SOUNDENCLOSURE.html
Quote:
from 95 dB to 65 dB


http://www.complaintsboard.com/complaints/blendtec-hp3a-3-hp-blender-noise-level-orem-utah-c265050.html

Pretty impressive for just polycarbonate..... unless that's just marketing hype. Very tempting and I like the hatchback design.
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post #28 of 35 Old 09-08-2013, 10:01 AM - Thread Starter
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I've been traveling so the blender box has been on the back burner but it is finally starting to take shape. As you can see, there's not much clearance between the box and the cabinets. Maybe 1/2" or so.

I accidentally bought 3/4" MDF instead of the intended 1/2" MDF. Not enough room in the kitchen to double layer it so I'm making a quick "prototype" box and we will see how well it does. I own plenty of green glue and a decibel meter so time will tell if there is a version 2.0 of the blender box.




The top will open up to make it easier to remove the blender pitcher.



I used plenty of decking screws and glue to make this a rock solid box.



I pre-drilled with a drill bit the same size as the screw shank (not the threads) and still had splitting issues.

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post #29 of 35 Old 09-08-2013, 10:19 AM - Thread Starter
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Next stop is the belt sander to make everything flat.

I'll be treating the inside mdf edges with drywall spackle before applying an oil based primer and paint. That trick comes from this article at finewoodworking.com.

Only a few issues to work out...

ISSUE #1 (woodworking)
=================
I'm a little nervous about the MDF and hinges. I was hoping to use butt / end hinges to maintain maximum door mass but I don't know how strong it will be. See pics below. MDF isn't exactly hardwood.

ISSUE #2 (electrical)
================
I need to find an external switch to operate the blender. I'm using an extension cord and a plug to make an outlet inside the box. I'd like to insert a push button or flip switch to activate the blender. I think I found a 120v 20 amp switch.... push buttons of appropriate ratings are hard to come by though.





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post #30 of 35 Old 09-08-2013, 10:29 AM
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Different Green Glue.



http://www.greengluecompany.com/

Acoustic sealant.

Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense. -Buddha

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