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danOO00
Joined: 22 May 2007
Posts: 70
Location: Putnam County, NY
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| Posted: Mon Nov 10, 2008 8:56 pm Post subject: Hushbox for PG? |
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I am considering making a hushbox for a PG Xtra, and am looking for anyone with experience and can offer some advice.
I cannot run ductwork to the box without major effort, as the ceiling joists run the wrong way to evacuate air to another room. I am thinking about attaching a a plenum to the top of the PJ as I have done seen for XG's. The plenum would have ~ 200 CFM fans blowing air into the void between the sheetrock covered ceiling joists.
I would open a vent or 2 in the same void through the sheetrock 5-6 feet away to allow the warm air to exhaust back into the room. The hushbox would basically cover the whole PJ pretty snugly- allowing air to enter only at the front around the lenses.
Whaddya think?
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Mon Nov 10, 2008 10:18 pm Post subject: |
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First question--a PG does not make near the racket of an XG. Is it really worth the effort to you (yes, a hushbox will make fan levels lower, but the PG can pretty much go unnoticed)?
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Dave
A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Tue Nov 11, 2008 1:47 am Post subject: |
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If you add one single resistor, to one single fan on the XG, then the XG is about the same as a PG, or a G70, or every other CRT I've heard.
And yes, a PG needs a hushbox. It also need more fans than NEC put in it - some on the deflection heatsink, and it also needs an extra heatsink and fan under the baseplate, opposite the C and F drives.
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danOO00
Joined: 22 May 2007
Posts: 70
Location: Putnam County, NY
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| Posted: Tue Nov 11, 2008 3:17 am Post subject: |
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I sit about 30" directly under the PG, and although the noise it is not a complete nuisance, a hushbox would definitely make me happier if I can manage to do it right. I am always distracted during low volume scenes, so if a day or two spent camping in the workshop will fix this I am willing to give it a shot.
Has anyone here ever done something like what I describe with a plenum/hushbox on a PG? I have seen examples with an XG, and have searched a bit, but haven't found any PG hushboxes out there yet..
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danOO00
Joined: 22 May 2007
Posts: 70
Location: Putnam County, NY
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| Posted: Thu Nov 13, 2008 7:44 pm Post subject: |
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It looks like I will be a pioneer on this hushbox project- I will post again when when I have made some some progress.
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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Fri Nov 14, 2008 1:12 am Post subject: |
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Afryia,
Where does the air flow into your box?
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danOO00
Joined: 22 May 2007
Posts: 70
Location: Putnam County, NY
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| Posted: Fri Nov 14, 2008 1:53 am Post subject: |
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Afriya- Very nice.. what fans/controller did you end up using? I also am interested in the airflow path.
Thanks
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Mr. Green
Joined: 23 Feb 2007
Posts: 1394
Location: Calgary
TV/Projector: Marquee 9501LC / NEC 9PG+
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| Posted: Fri Nov 14, 2008 2:20 am Post subject: |
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I sit under my PG and I don't even notice it anymore. I agree, you can really hear it in quiet scenes, but it's nowhere near as loud as people made NEC's out to be. I actually like the low hum. I find the high pitched whine from my buddy's digital way more distracting.
Cool project though. Keep us informed! 
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Current Projector Marquee9501LC with PS3 (BLu-Ray) at 1080P LOVE IT! Screen is an Elunevision 120" 4:3 (2.4 gain - no hotspots). (also own a NEC 9PG+)
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Fri Nov 14, 2008 2:21 am Post subject: |
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Dan,
Be sure to take some pictures as you progress on your hushbox, I'll likely be making one for my G70 and would like to see how others are building theirs.
Erik
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Fri Nov 14, 2008 4:45 am Post subject: |
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Dan, plenty of others have made hushboxes for PGs - search AVS (+archives) as well as here.
You certainly aren't the first, just that most don't post anymore.
Mark
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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Sat Nov 15, 2008 5:45 am Post subject: |
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| Zebu Fellenz wrote: | | Where does the air flow into your box? |
For the box air comes in around the lens opening. Dido for the G70 air is sucked in around the lenses.
| danOO00 wrote: | | what fans/controller did you end up using? I also am interested in the airflow path. |
Air flow is front to back just like the PJ.
I use a PC fan controller from Scythe and two Scythe fans. There is a 120V line level thermostat to turn the fan controller on and off at a set temp. The controller also has 4 temp probes to monitor various temps.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Wed Nov 19, 2008 8:51 pm Post subject: |
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My 9PG+ aint here yet (should turn up today or tomorrow), but im quite sure it wont be any worse then the Mitsubishi SE-1 was, cause it was very loud.
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deronmoped
Joined: 03 Nov 2006
Posts: 1154
Location: San Diego
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| Posted: Thu Nov 20, 2008 3:54 am Post subject: |
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You might be able to get away with just a barrier between you and the PJ. Something to deflect the noise.
Deron.
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dropzone7
Joined: 12 Jun 2007
Posts: 1069
Location: Charlotte, NC
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| Posted: Thu Nov 20, 2008 3:58 am Post subject: |
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If anyone wants to check out the box my dad and I made you can look over here http://www.avsforum.com/avs-vb/showthread.php?t=1027039 on AVS Forum. I have been meaning to start a thread here on Curt's site but it was just easier to keep track of things in one forum. The hushbox stuff is on page 2.
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Nov 20, 2008 7:46 am Post subject: |
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Not NEC but you might get some ideas.
http://www.curtpalme.com/forum/viewtopic.php?p=121244#121244
Air circulation is completely isolated from theater room and no loud duct fan used.
Two 75CFM fresh air fans in wall are connected to Barcos thermistor controlled fan system.
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