OBX
The room I am putting this in is 24' long x 16'wide x 10' high and the room will be pitch black (no ambient light). My question is with an Optoma HD70 and a screen of 145" diagnal, does it matter what screen gain I get since there is no light? If so what do you recommend Light grey or white GOO paint? What will be the difference? With that said, once the screen is built, what determains how low I should hang the projector from the ceiling in relation to the top of the sreen. The reason I ask this is because I don't want to set this up and have the sceen look distorted. Last question is will a ceiling fan running in front of the projector distort the picture.
I know I have a lot of questions, but since I will be spending several thousand on this, I want it right.
Thank you to ALL who answer.
Answer
The first 2 links are to 2 reviews of the HD 70. They are a must read to get a good overview of the projector.
Note that the first link is to the page that contains screen recommendations for the HD70. A maximum 100-106" screen is recommended (unless you want a high gain screen -- which risks hot spotting and colour shifts). So I'd suggest your idea of a 145" screen is unrealistic.
Furthermore do you really need that big a screen? Take into account that THX recommend no more than a 40 degree viewing angle (SMPTE suggests more than 30 degrees) ... that is the angle subtended from the viewing position between the left and right screen edge (see the 3rd link for a calculator). While this is a personal preference issue too big a screen is as bad as (or worse than) too small since it will result in viewer fatigue. So, keeping in mind that the apparent size of the screen stays the same as long as the viewing angle is constant you can define the viewing angle you prefer then adjust the viewing distance to accommodate a smaller screen (that will allow room for a second row of seats if you project along the long axis of the room).
A further consideration is the vertical height of the screen. While 10 ft room height is great, a 16:9 143" screen is 70" high, and to mount it optimally for a 40" viewing height you need to have the bottom 15" or less above the ground (eyes should be level with a point no more than 1/3 to 1/2 the height of the screen). This doesn't leave much room for a centre speaker.
Finally, the offset angle on the HD70 is fairly steep (and there is no lens shift), so the projector has to be mounted well above the top of the screen if ceiling mounted. The manual is confusing, but it appears that you need to mount the projector 16" above the top of the screen for a 100" 16:9 screen (and more for a larger screen).
So if you assume 24" from floor to bottom of screen (not absolute, but a common dimension), a 102" 16:9 screen would be 54.2" high, plus a bit over 16" offset ... or a projector mounting height of 94". A 143" screen would require a mounting height of approximately 115" ... which would not fit.
I suggest you plan on a smaller screen than 143" --- ie. 100" or so -- and, given the lack of lens shift and the confusion in the manual re offset angle, mount the projector at the height you calculate based on 16" offset for a 100" screen (i.e. about 94" from floor to the centre of the lens). Then see where the light falls, mark the wall and mount or paint the screen to match. If you use Goo or some other paint formula (There is some good advice on alternatives on the AVS Forum (Google it!) DIY Screen section) paint the screen oversize and then mask with black cloth or paint to match the projected image.
If you want a screen so large you can't accommodate a centre speaker, consider an accoustically transparent screen material instead of paint. See the 4th link for a supplier for a DIY solution.
As to a fan ... you don't want anything in the light path, so you will want to have the projector below the fan ... another reason to go with the smaller screen.
There ... a long answer, but I hope it helps.
The first 2 links are to 2 reviews of the HD 70. They are a must read to get a good overview of the projector.
Note that the first link is to the page that contains screen recommendations for the HD70. A maximum 100-106" screen is recommended (unless you want a high gain screen -- which risks hot spotting and colour shifts). So I'd suggest your idea of a 145" screen is unrealistic.
Furthermore do you really need that big a screen? Take into account that THX recommend no more than a 40 degree viewing angle (SMPTE suggests more than 30 degrees) ... that is the angle subtended from the viewing position between the left and right screen edge (see the 3rd link for a calculator). While this is a personal preference issue too big a screen is as bad as (or worse than) too small since it will result in viewer fatigue. So, keeping in mind that the apparent size of the screen stays the same as long as the viewing angle is constant you can define the viewing angle you prefer then adjust the viewing distance to accommodate a smaller screen (that will allow room for a second row of seats if you project along the long axis of the room).
A further consideration is the vertical height of the screen. While 10 ft room height is great, a 16:9 143" screen is 70" high, and to mount it optimally for a 40" viewing height you need to have the bottom 15" or less above the ground (eyes should be level with a point no more than 1/3 to 1/2 the height of the screen). This doesn't leave much room for a centre speaker.
Finally, the offset angle on the HD70 is fairly steep (and there is no lens shift), so the projector has to be mounted well above the top of the screen if ceiling mounted. The manual is confusing, but it appears that you need to mount the projector 16" above the top of the screen for a 100" 16:9 screen (and more for a larger screen).
So if you assume 24" from floor to bottom of screen (not absolute, but a common dimension), a 102" 16:9 screen would be 54.2" high, plus a bit over 16" offset ... or a projector mounting height of 94". A 143" screen would require a mounting height of approximately 115" ... which would not fit.
I suggest you plan on a smaller screen than 143" --- ie. 100" or so -- and, given the lack of lens shift and the confusion in the manual re offset angle, mount the projector at the height you calculate based on 16" offset for a 100" screen (i.e. about 94" from floor to the centre of the lens). Then see where the light falls, mark the wall and mount or paint the screen to match. If you use Goo or some other paint formula (There is some good advice on alternatives on the AVS Forum (Google it!) DIY Screen section) paint the screen oversize and then mask with black cloth or paint to match the projected image.
If you want a screen so large you can't accommodate a centre speaker, consider an accoustically transparent screen material instead of paint. See the 4th link for a supplier for a DIY solution.
As to a fan ... you don't want anything in the light path, so you will want to have the projector below the fan ... another reason to go with the smaller screen.
There ... a long answer, but I hope it helps.
building home theater in new home....?
Miss Britt
we are moving ain a couple months and my dads a contractor and etc. we have a media room in the plans.
can someone show me some sights to how to design it?? thank you. and any other pointers would help
im going with a enclosed rectangular room with a rectangular projector :]
Answer
Whether you choose to hire an experienced, certified professional* or not I have taken the opportunity to provide some basic suggestions and list a few select resources below. Hopefully this will help provide some ideas or guidance when it comes to building a new home theater. *(If you would like to install any automation I highly recommended that you hire an experienced, certified professional.)
If you would like to create the most immersive, theater-like experience (depending on your budget of course) I strongly recommend that you consider purchasing a high-performance projection system consisting of a home theater projector (such as JVCâs DLA-RS2 Home Cinema Projector,) video processor, and 102- to 120-inch projection screen capable of displaying movies in a more natural anamorphic 2.35:1 aspect ratio âCinemaScopeâ format. When it comes to fixed-frame front projection screens you would be hard-pressed to do better than Stewart Filmscreenâs GrayHawk RS G3 (or StudioTek 130 G3) screen material mounted to Stewartâs curved Cine-W frame or their flat Luxus Deluxe Screenwall frame.
If your budget allows I also recommend complementing your home theater projector with a high-performance LCD HDTV to handle the majority of your television viewing needs. One important benefit of using the two displays is that it would increase the time between service intervals when it comes to projector relamping. This not only reduces the cost of ownership but would also reduce the wear and tear on both displays.
I would like to pass on one important critique with respect to a significant number of home theaters you will see in articles and portfolios: Ideally within an observerâs field of view (FOV), especially for the more critical area commonly referred to as the âsurround,â the room surfaces should be finished or covered with spectrally diffuse and spectrally neutral materials; avoid strong hues at all costs. One of the more effective methods is to use a MATTE gray paint with a Munsell value between N4 and N8. (From darker to lighter: N4 has L*a*b* values of 40, 0, 0 and N8 has L*a*b* values of 80, 0, 0; Note: some prefer to use Kodak 18% gray as a neutral gray reference rather than the Munsell renotation.) The remainder of the room may be safely finished in your choice from any of the Munsell âNearly Neutralâ pastel colors (though a neutral gray will always be ideal.) Using this approach will help maximize the âambient contrastâ of your viewing environment while allowing the maximum color fidelity from your displays.
I also highly recommend that you install plenty of nonmetallic corrugated flexible conduit, aka nonmetallic flexible raceway or innerduct, for all your A/V and structured cabling requirements. Where applicable use low-voltage wall brackets (or boxes,) to which the innerduct may be connected. This will allow you to use a variety of custom and keystone style wallplates, which will provide a high quality, professional finished appearance for all of your A/V and structured cabling connections.
By the way, whenever you are working with exposed wood wall framing, i.e., no gypsum board, it is very important that you ALWAYS install nail-plates (aka Nail Stoppers¹) wherever you drill holes in wood wall framing for the purpose of routing conduit that will be carrying wire and cable. Nail-plates are intended to protect all wire and cable in the conduit from being pierced and damaged by nails and screws that will be fastened to the wall framing.
Good luck.
######## RESOURCES ########
Looking to build a two movie theatre - any suggestions on where to start?
http://answers.yahoo.com/question/index?qid=20080104135319AA1OR89
I am building a house and want some advice on a home theater?
http://answers.yahoo.com/question/index?qid=20080130050846AAWFUfS
Web forums with pictures of home theatre rooms?
http://answers.yahoo.com/question/index?qid=20071116161409AA716dT
How to determine BEST screen size for home theatre projector viewing?
http://answers.yahoo.com/question/index?qid=20071121170743AAnVZ3T
Should I paint the media room all black?
http://answers.yahoo.com/question/index?qid=20070316073203AAKB1Go
Suggestions on color to paint walls of home theater?
http://answers.yahoo.com/question/index?qid=20070716204430AAjTjus
Home Theater Suggestions for back wall?
http://answers.yahoo.com/question/index?qid=20080402220142AAfn096
Whatâs the best position for TV lighting?
http://answers.yahoo.com/question/index?qid=20080128174452AAKVNmP
Where should light source be placed/located in the living room relative to the TV?
http://answers.yahoo.com/question/index?qid=20071005181157AAaIVzd
Pre-wire help....what are the green and white wires for?
http://answers.yahoo.com/question/index?qid=20080322111924AAVVn7P
________________________
Media Environment Design
Design Samples
http://www.medesign.tv/Design_Services/Documentation.php
Paradise Theater Design Samples
http://www.medesign.tv/Paradise%20Theater/PTSamples.php
Audio Video Interiors How To, Page 1
http://blog.audiovideointeriors.com/howto//index.html
Audio Video Interiors How To, Page 2
http://blog.audiovideointeriors.com/howto//index1.html
WSDG Architectural and Acoustic Design
Home Theaters Portfolio
http://www.wsdg.com/dynamic.php5?id=portfolio/home
THX Architectural Suggestions
http://www.film-tech.com/warehouse/manuals/THXAS.pdf
TAP Theatre Alignment Program Guidelines
http://www.film-tech.com/warehouse/manuals/TAPGUIDELINES.pdf
CinemaSource - Home Theater Articles
http://www.cinemasource.com/articles.html
Home Toys Learning Library - Recommended Reading
http://www.hometoys.com/learn.htm
Home Theater Design by Steve Faber
http://www.hometoys.com/article_display.php?displayid=108#Home%20Theater%20Design%20by%20Steve%20Faber
Guide to Low-Voltage and Limited-Energy Systems
http://www.mikeholt.com/documents/lowvoltage/pdf/LowVoltBook.pdf
________________________
Acoustics Research - NRC-IRC
http://irc.nrc-cnrc.gc.ca/ie/acoustics/
Internal Report IRC-IR-693:
Sound Transmission Through Gypsum Board Walls
http://irc.nrc-cnrc.gc.ca/pubs/ir/ir693/ir693.pdf
Soundproofing Made Simple
http://www.soundproofing101.com
Soundproofing Discussion Forum
http://www.supersoundproofing.com
________________________
Carpet Cushion Council Publications
http://www.carpetcushion.org/educational_pubs.htm
Carpet and Rug Institute - Selecting the Right Carpet
http://www.carpet-rug.org/commercial-customers/selecting-the-right-carpet/index.cfm
######## PRODUCTS & MATERIALS ########
JVC Reference Series DLA-RS2 Home Cinema Projector
http://pro.jvc.com/prof/attributes/features.jsp?model_id=MDL101733
Stewart Filmscreen Front Projection Screen Materials
http://www.stewartfilmscreen.com/FrontProjection.html
Stewart Filmscreen Fixed Screen Models
http://www.stewartfilmscreen.com/FIXEDSCREENMODELS.htm
________________________
Carlon Product Brochures Index
http://www.carlon.com/Brochures.html
Riser-Gard® Nonmetallic Corrugated Flexible Conduit
http://www.carlon.com/Master%20Catalog/Flexible_Raceway_Brochure.pdf
Carlon Structured Cable Management Systems Handbook
http://www.carlon.com/Installation_Training/IT-2B56.pdf
Installation & Training
http://www.carlon.com/InstallationInst.html
Leviton Integrated Networks and Controls - Wallplates
http://www.leviton.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=10411&minisite=10026
Leviton Wallplates (Industrial / Commercial)
http://www.leviton.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=10985&minisite=10026
Leviton Structured Cabling Wallplates
http://www.leviton.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=15206&minisite=10027
Leviton Architectural Edition⢠Residential Products
http://www.leviton.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=15083&minisite=10023
Liberty PanelCrafters
http://www.panelcrafters.com
¹Simpson Strong-Tie Nail Stoppers
http://www.strongtie.com/products/connectors/NS-NSP-PSPNZ.asp
________________________
Kinetics Noise Control
http://www.kineticsnoise.com
PAC International
http://www.pac-intl.com
Acoustical Solutions
http://www.acousticalsolutions.com
ASC WallDamp/IsoDamp Soundproofing System
http://www.asc-soundproof.com/index-walldamp.htm
http://www.asc-soundproof.com/soundproofing-arch-guide.pdf
Acoustiblok Soundproofing and Sound Deadening Materials
http://www.acoustiblok.com
Acoustical Surfaces Inc. - Soundproofing and Acoustical Materials
http://www.acousticalsurfaces.com
Quiet Solution Advanced Soundproofing Products
http://www.quietsolution.com
http://en.wikipedia.org/wiki/QuietRock
Conwed Designscape - Submittals & Literature
http://www.conweddesignscape.com/submittals/index.html
Owens Corning Acoustic Systems
http://www.owenscorning.com/around/sound/acoustic.html
Owens Corning Quietzone® Volume Control for the Homeâ¢
http://www.owenscorning.com/quietzone/quietzone.asp
######## REFERENCE BOOKS ########
⢠Noise and Vibration Control by Leo L. Beranek
⢠Noise Control in Buildings by Cyril M. Harris
⢠Concepts in Architectural Acoustics by M. David Egan
Acoustical Society of America - Publications
http://asa.aip.org/publications.html
http://www.bookmasters.com/marktplc/00726.htm
Master Handbook of Acoustics by F. Alton Everest
http://www.mhprofessional.com/contributor.php?id=12239
http://books.google.com/books?id=sgwg1Vwm9VUC
Book Review
http://www.audioxpress.com/reviews/media/403macarthur2106.pdf
Â
Whether you choose to hire an experienced, certified professional* or not I have taken the opportunity to provide some basic suggestions and list a few select resources below. Hopefully this will help provide some ideas or guidance when it comes to building a new home theater. *(If you would like to install any automation I highly recommended that you hire an experienced, certified professional.)
If you would like to create the most immersive, theater-like experience (depending on your budget of course) I strongly recommend that you consider purchasing a high-performance projection system consisting of a home theater projector (such as JVCâs DLA-RS2 Home Cinema Projector,) video processor, and 102- to 120-inch projection screen capable of displaying movies in a more natural anamorphic 2.35:1 aspect ratio âCinemaScopeâ format. When it comes to fixed-frame front projection screens you would be hard-pressed to do better than Stewart Filmscreenâs GrayHawk RS G3 (or StudioTek 130 G3) screen material mounted to Stewartâs curved Cine-W frame or their flat Luxus Deluxe Screenwall frame.
If your budget allows I also recommend complementing your home theater projector with a high-performance LCD HDTV to handle the majority of your television viewing needs. One important benefit of using the two displays is that it would increase the time between service intervals when it comes to projector relamping. This not only reduces the cost of ownership but would also reduce the wear and tear on both displays.
I would like to pass on one important critique with respect to a significant number of home theaters you will see in articles and portfolios: Ideally within an observerâs field of view (FOV), especially for the more critical area commonly referred to as the âsurround,â the room surfaces should be finished or covered with spectrally diffuse and spectrally neutral materials; avoid strong hues at all costs. One of the more effective methods is to use a MATTE gray paint with a Munsell value between N4 and N8. (From darker to lighter: N4 has L*a*b* values of 40, 0, 0 and N8 has L*a*b* values of 80, 0, 0; Note: some prefer to use Kodak 18% gray as a neutral gray reference rather than the Munsell renotation.) The remainder of the room may be safely finished in your choice from any of the Munsell âNearly Neutralâ pastel colors (though a neutral gray will always be ideal.) Using this approach will help maximize the âambient contrastâ of your viewing environment while allowing the maximum color fidelity from your displays.
I also highly recommend that you install plenty of nonmetallic corrugated flexible conduit, aka nonmetallic flexible raceway or innerduct, for all your A/V and structured cabling requirements. Where applicable use low-voltage wall brackets (or boxes,) to which the innerduct may be connected. This will allow you to use a variety of custom and keystone style wallplates, which will provide a high quality, professional finished appearance for all of your A/V and structured cabling connections.
By the way, whenever you are working with exposed wood wall framing, i.e., no gypsum board, it is very important that you ALWAYS install nail-plates (aka Nail Stoppers¹) wherever you drill holes in wood wall framing for the purpose of routing conduit that will be carrying wire and cable. Nail-plates are intended to protect all wire and cable in the conduit from being pierced and damaged by nails and screws that will be fastened to the wall framing.
Good luck.
######## RESOURCES ########
Looking to build a two movie theatre - any suggestions on where to start?
http://answers.yahoo.com/question/index?qid=20080104135319AA1OR89
I am building a house and want some advice on a home theater?
http://answers.yahoo.com/question/index?qid=20080130050846AAWFUfS
Web forums with pictures of home theatre rooms?
http://answers.yahoo.com/question/index?qid=20071116161409AA716dT
How to determine BEST screen size for home theatre projector viewing?
http://answers.yahoo.com/question/index?qid=20071121170743AAnVZ3T
Should I paint the media room all black?
http://answers.yahoo.com/question/index?qid=20070316073203AAKB1Go
Suggestions on color to paint walls of home theater?
http://answers.yahoo.com/question/index?qid=20070716204430AAjTjus
Home Theater Suggestions for back wall?
http://answers.yahoo.com/question/index?qid=20080402220142AAfn096
Whatâs the best position for TV lighting?
http://answers.yahoo.com/question/index?qid=20080128174452AAKVNmP
Where should light source be placed/located in the living room relative to the TV?
http://answers.yahoo.com/question/index?qid=20071005181157AAaIVzd
Pre-wire help....what are the green and white wires for?
http://answers.yahoo.com/question/index?qid=20080322111924AAVVn7P
________________________
Media Environment Design
Design Samples
http://www.medesign.tv/Design_Services/Documentation.php
Paradise Theater Design Samples
http://www.medesign.tv/Paradise%20Theater/PTSamples.php
Audio Video Interiors How To, Page 1
http://blog.audiovideointeriors.com/howto//index.html
Audio Video Interiors How To, Page 2
http://blog.audiovideointeriors.com/howto//index1.html
WSDG Architectural and Acoustic Design
Home Theaters Portfolio
http://www.wsdg.com/dynamic.php5?id=portfolio/home
THX Architectural Suggestions
http://www.film-tech.com/warehouse/manuals/THXAS.pdf
TAP Theatre Alignment Program Guidelines
http://www.film-tech.com/warehouse/manuals/TAPGUIDELINES.pdf
CinemaSource - Home Theater Articles
http://www.cinemasource.com/articles.html
Home Toys Learning Library - Recommended Reading
http://www.hometoys.com/learn.htm
Home Theater Design by Steve Faber
http://www.hometoys.com/article_display.php?displayid=108#Home%20Theater%20Design%20by%20Steve%20Faber
Guide to Low-Voltage and Limited-Energy Systems
http://www.mikeholt.com/documents/lowvoltage/pdf/LowVoltBook.pdf
________________________
Acoustics Research - NRC-IRC
http://irc.nrc-cnrc.gc.ca/ie/acoustics/
Internal Report IRC-IR-693:
Sound Transmission Through Gypsum Board Walls
http://irc.nrc-cnrc.gc.ca/pubs/ir/ir693/ir693.pdf
Soundproofing Made Simple
http://www.soundproofing101.com
Soundproofing Discussion Forum
http://www.supersoundproofing.com
________________________
Carpet Cushion Council Publications
http://www.carpetcushion.org/educational_pubs.htm
Carpet and Rug Institute - Selecting the Right Carpet
http://www.carpet-rug.org/commercial-customers/selecting-the-right-carpet/index.cfm
######## PRODUCTS & MATERIALS ########
JVC Reference Series DLA-RS2 Home Cinema Projector
http://pro.jvc.com/prof/attributes/features.jsp?model_id=MDL101733
Stewart Filmscreen Front Projection Screen Materials
http://www.stewartfilmscreen.com/FrontProjection.html
Stewart Filmscreen Fixed Screen Models
http://www.stewartfilmscreen.com/FIXEDSCREENMODELS.htm
________________________
Carlon Product Brochures Index
http://www.carlon.com/Brochures.html
Riser-Gard® Nonmetallic Corrugated Flexible Conduit
http://www.carlon.com/Master%20Catalog/Flexible_Raceway_Brochure.pdf
Carlon Structured Cable Management Systems Handbook
http://www.carlon.com/Installation_Training/IT-2B56.pdf
Installation & Training
http://www.carlon.com/InstallationInst.html
Leviton Integrated Networks and Controls - Wallplates
http://www.leviton.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=10411&minisite=10026
Leviton Wallplates (Industrial / Commercial)
http://www.leviton.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=10985&minisite=10026
Leviton Structured Cabling Wallplates
http://www.leviton.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=15206&minisite=10027
Leviton Architectural Edition⢠Residential Products
http://www.leviton.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=15083&minisite=10023
Liberty PanelCrafters
http://www.panelcrafters.com
¹Simpson Strong-Tie Nail Stoppers
http://www.strongtie.com/products/connectors/NS-NSP-PSPNZ.asp
________________________
Kinetics Noise Control
http://www.kineticsnoise.com
PAC International
http://www.pac-intl.com
Acoustical Solutions
http://www.acousticalsolutions.com
ASC WallDamp/IsoDamp Soundproofing System
http://www.asc-soundproof.com/index-walldamp.htm
http://www.asc-soundproof.com/soundproofing-arch-guide.pdf
Acoustiblok Soundproofing and Sound Deadening Materials
http://www.acoustiblok.com
Acoustical Surfaces Inc. - Soundproofing and Acoustical Materials
http://www.acousticalsurfaces.com
Quiet Solution Advanced Soundproofing Products
http://www.quietsolution.com
http://en.wikipedia.org/wiki/QuietRock
Conwed Designscape - Submittals & Literature
http://www.conweddesignscape.com/submittals/index.html
Owens Corning Acoustic Systems
http://www.owenscorning.com/around/sound/acoustic.html
Owens Corning Quietzone® Volume Control for the Homeâ¢
http://www.owenscorning.com/quietzone/quietzone.asp
######## REFERENCE BOOKS ########
⢠Noise and Vibration Control by Leo L. Beranek
⢠Noise Control in Buildings by Cyril M. Harris
⢠Concepts in Architectural Acoustics by M. David Egan
Acoustical Society of America - Publications
http://asa.aip.org/publications.html
http://www.bookmasters.com/marktplc/00726.htm
Master Handbook of Acoustics by F. Alton Everest
http://www.mhprofessional.com/contributor.php?id=12239
http://books.google.com/books?id=sgwg1Vwm9VUC
Book Review
http://www.audioxpress.com/reviews/media/403macarthur2106.pdf
Â
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