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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Sat Nov 03, 2007 12:05 am Post subject: Hushbox Questions |
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It's time to go the next step and build a hushbox. I looking to build the most compact (thinnest) practical.
Do you normally leave the PJ covers on or off with a hushbox?
What material is best for lining a hushbox?
The outer shell, what is the best material to use?
Are there techniques I should use during construction. I'm an amateur cabinet maker so general construction isn't issue. What I'm looking for are techniques to improve sound deadening properties.
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larryk
Joined: 23 Aug 2007
Posts: 106
Location: Edmonton Alberta
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| Posted: Sat Nov 03, 2007 6:04 am Post subject: |
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MDF makes a good dense but nicely finished box. You should use urethane glue for constrution, it's the strongest glue for that kind of application. I am not sure what you use to line the inside but you could use thin ridgid fibreglass with foil on the inside. The foil side would allow smooth air flow as well.
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Sat Nov 03, 2007 8:48 pm Post subject: |
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Kal,
I read through both those links the other day. You used fiberglass tile and Maurizio Prandi used polyurethane foam.
Now I have some left over ceiling tile, the paper cellulose type and some rockwool insulation.
Of the four materials which has the best acoustic properties for a hushbox?
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My Volt Blog
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KennyG
Joined: 10 Feb 2007
Posts: 254
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| Posted: Sat Nov 03, 2007 8:57 pm Post subject: |
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Of the H-boxes I've built, this one is the quitest...and ugliest!
I have always removed the plastic outer covers, there's no need for them.
My H-box is sealed around the lenses, and has it's cool air drawn in through a thin, wide tunnel that runs from the front of the h-box to the back...this keeps the noise level very low, when it's running you really can't hear it.
I went the extra mile and used 2" acoustic foam inside mine...I also lined the air inlet tunnel with it. Lastly I have installed an air filter at the inlet, this keeps the pj dust free.
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Sat Nov 03, 2007 9:02 pm Post subject: |
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| AFryia wrote: | Kal,
I read through both those links the other day. You used fiberglass tile and Maurizio Prandi used polyurethane foam.
Now I have some left over ceiling tile, the paper cellulose type and some rockwool insulation.
Of the four materials which has the best acoustic properties for a hushbox? |
No idea - sorry. I think a lot of it is just keeping it nicely enclosed so that none of the noise has a chance to escape. The noise then just bounces around until it dies out. Put any of the 4 things in there to soak up the bouncing sound and you're good to go.
Kal
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My basement/HT/bar/brewery build 2.0
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scottap
Joined: 27 Mar 2007
Posts: 177
Location: Palo Alto, CA
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| Posted: Sat Nov 03, 2007 11:46 pm Post subject: |
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| KennyG wrote: | Of the H-boxes I've built, this one is the quitest...and ugliest!
I have always removed the plastic outer covers, there's no need for them.
My H-box is sealed around the lenses, and has it's cool air drawn in through a thin, wide tunnel that runs from the front of the h-box to the back...this keeps the noise level very low, when it's running you really can't hear it.
I went the extra mile and used 2" acoustic foam inside mine...I also lined the air inlet tunnel with it. Lastly I have installed an air filter at the inlet, this keeps the pj dust free. |
Kenny. Have you posted pictures of your hushbox anywhere?
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KennyG
Joined: 10 Feb 2007
Posts: 254
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| Posted: Tue Nov 06, 2007 4:29 am Post subject: |
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| scottap wrote: | | KennyG wrote: | Of the H-boxes I've built, this one is the quitest...and ugliest!
I have always removed the plastic outer covers, there's no need for them.
My H-box is sealed around the lenses, and has it's cool air drawn in through a thin, wide tunnel that runs from the front of the h-box to the back...this keeps the noise level very low, when it's running you really can't hear it.
I went the extra mile and used 2" acoustic foam inside mine...I also lined the air inlet tunnel with it. Lastly I have installed an air filter at the inlet, this keeps the pj dust free. |
Kenny. Have you posted pictures of your hushbox anywhere? |
No I haven't, but if needed I could get a friend to come over and do it.
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dbaisey
Joined: 09 Mar 2006
Posts: 821
Location: Southern Cal LA / Seattle WA
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| Posted: Tue Nov 06, 2007 11:54 am Post subject: |
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Kenny's projector was so quiet I had to have him open the H box so I could hear what it was trying to tell me. For me it was spooky and to quiet for my comfort level. Doug
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Tue Nov 06, 2007 3:56 pm Post subject: |
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Glass fiber is way to go if you want thin and curvy design. It's lot of work though. 
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scottap
Joined: 27 Mar 2007
Posts: 177
Location: Palo Alto, CA
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| Posted: Tue Nov 06, 2007 5:21 pm Post subject: |
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| KennyG wrote: | | scottap wrote: | | KennyG wrote: | Of the H-boxes I've built, this one is the quitest...and ugliest!
I have always removed the plastic outer covers, there's no need for them.
My H-box is sealed around the lenses, and has it's cool air drawn in through a thin, wide tunnel that runs from the front of the h-box to the back...this keeps the noise level very low, when it's running you really can't hear it.
I went the extra mile and used 2" acoustic foam inside mine...I also lined the air inlet tunnel with it. Lastly I have installed an air filter at the inlet, this keeps the pj dust free. |
Kenny. Have you posted pictures of your hushbox anywhere? |
No I haven't, but if needed I could get a friend to come over and do it. |
I'd certainly like to see photos, particuarly of the air intake.
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KennyG
Joined: 10 Feb 2007
Posts: 254
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| Posted: Thu Nov 08, 2007 5:27 am Post subject: |
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| Ile wrote: | Glass fiber is way to go if you want thin and curvy design. It's lot of work though.
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Now that is beautiful!!!
I have often thought of doing one out of fiberglass, and after seeing that, I might. I just have to work out the details of the intake tunnel, and being able to line it with acoustic foam...I suppose it would have to be a bolt-on tunnel.
I'll work on a couple pic's this weekend...gonna have some friends over to watch Cars on BR, so getting someone over with a camera shouldn't be a problem.
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