***Working Man's DIY Dedicated Home Theater*** - Page 14

I moved the projector back in the hushbox about 2" last night so that the reflected light completely misses the lens. It seems to look better but I wouldn't swear its not an psycho-optical illusion.

Wanted to post a quote of a to-do list I shared long ago, see I'm a man of my word!

I'm going to live with the current state of the ventilation and see if any further tweaks are necessary but it seems to work fine. I have spent some extended time up there now and will say the amount of heat that has been removed is considerable. During these cooler days I have been comfortable without fiddling with the HVAC thermostat at all. Heat buildup is virtually non-existent except for body heat which I havent noticed being a problem.

Now my next fun adventure will be ACOUSTIC TREATMENTS!! I decided to use Roxul safe-n-sound due to these perceived advantages:

• Low cost
• No FIBERGLASS!!
• Easily obtainable through Lowes
• Did I mention NO FIBERGLASS!!?
• Performs similar to OC703 or Linacoustic
• Cheaper

I ordered 5 packs of 8 2'x4'x3.5" Roxul safe-n-sound. One thing about this stuff is its floppy so everywhere it goes will need a frame. I plan to address the usual suspects responsible for small room acoustic issues including:

• LCR First reflection points for side walls and ceiling
• More extensive bass trapping in corners
• Treat as needed Back and Front Walls
• Measure modify repeat

I'm tired of itching.... Spent too much time as of late in my attic rooting around.

I hope the panasonic fans are as durable as they touted in addition to the labor they are quite pricey to replace....

Yup, I happened upon this as an accident. Lowes can get it.

Click here and do "store pickup" to your local Lowes. They will special order it for you and NO SHIPPING COSTS! Woot.

Its an even better deal if you can come upon one of their coupons, like 10%off or 10 off 50.......

Oh shoot, dang man sorry to hear that. I haven't gotten a call and it was like two weeks ago...... I'll update if mine comes in without issue.

Dude, major coincidence, they just called and said it was in. You might give it a shot again......

Why can't I look away from this......?lol

My contact at lowes said they got it from Prime source:

NORTH CAROLINA - Greensboro 800-488-2294 Greensboro@primesourcebp.com

I have ordered OC703 from SPI products before. They are local and have an office in Charlotte:

Address:
Woodland III 3300-A Woodpark Blvd
Charlotte, NC
USA, 28206

Main Phone: (704) 598-9899
Fax: (704) 921-2950

Email: charlotte@spi-co.com

Your Welcome TMcG,

I spoke with store manager at my local lowes and he said they had no issues getting it, but it all depends on your local market. It really makes no sense to me though.

OK, I need some help here.

Since moving my projector to the projector box, I have some serious vibrations in the projector image during intense low bass sequences. I only notice it on music since the image is static but its still annoying.


The hush-box is very rigid and mounted solidly. However the old ceiling mount was quite flimsy and I could elicit movement with a single finger! So what gives with all the vibration now!? I did place rubber grommets between the projector box, wall, and soffit into which its mounted. See the Mounting here:



My guess is that since the box is so rigidly mounted the room vibrations are being transferred to the projector. Its not the upper bass range thats the problem, but like 25Hz on down when the room really starts to breathe you can see the projector shaking.

A couple thoughts:

• mount a plate on some medium density foam to place the projector on in the projector box to de-couple it from the box
• mount a plate on some springs to place the projector on in the projector box which would decouple the projector from the box.

I've seen both those decoupling methods used in commercial offerings for projector mount de-couplers but not sure if they will work here or how well.
Edited by NicksHitachi - 11/15/12 at 5:05am

Thanks for the input on the vibration guys.

I think youve set me on the right track. Im thinking of a plate of granite/marble with sorbothane feet inside the hush box to mount the projector on.......

Meanwhile spent all day yesterday making fabric frames for back soffit. Let me tell you the Kreg Jig is the real deal! Also stuffed the rear soffit with Roxul so it now functions as bass trap and BB absorber due to location.

This Roxul is awesome to work with..... Its quite floppy compared to OC703 and doesnt cut as pretty but its so much nicer on he senses.

Now i gotta find somewhere to stuff all this!



Which leads me to my next projects: SOFFITS AND ACOUSTIC TREATMENTS!!! WOOT!

Ill post some final pics of the back soffit once covered later today.

Hi RT,

Long time no see, been enyoying that projector I bet

Thanks, I spent all weekend working on it, makes the weekend go by fast though.....

UPDATE: More Teaser PHOTOS!

Filled up the rear soffit with Roxul:



Fashioned a Bass Trap for the Back corner:



I'm going to cover the backs of my acoustic treatments with kraft paper, its cheap an will help contain the fibers. Like this:




No glamour photos of the finished product yet, I barely got it all back together before it was time to fire up for evening viewing. I did take a before Photo so It will be interesting to show before and after.

Next up:

• Soffits
• Wall Treatments
• Ceiling Treatments

Thanks Ed!

Sometimes I wonder If I'm talking to myself here but I'm just as guilty as the next for lurking and not posting.....

The Dimensions are 24x17x17. This is the maximum size trap that will fit in the back corner. This size still yields an even number of triangles per 2x4 panel.

I think the 24x24x34" traps are preferred but I've seen 12x12x17 traps used too.....

No I'm not planning to cover the corner trap with reflective covering my room is nowhere close to over absorbed. Its actually already covered with burlap and placed into the theater.

I have given some thought to the over absorbed issue though. If I use any panel traps at or behind the seating area I am going to either do pressure traps like the one you built or velocity traps with reflective coverings like you mentioned or a combination of the two. This should help keep the room lively, especially behind the listener where some stray sound should help. The back wall is an exception to this rule since my room is so small my only hope here is to totally absorb it.

Here's my treatment theory(Comments/Suggestions Welcome):

• Build Soffits and fill with broadband absorption.
• Broadband absorption First Reflection points walls and ceiling.
• Bass Trap all corners possible(superchunks or panel straddles depending on materials avail.)
• Broadband absorption entire back wall
• Broadband absorption entire front wall
• Measure and interpret Waterfall(modal ringing) and ETC(Early reflections).
• Treat high gain early arrival reflections with surgical broadband absorption.
• Severe modal ringing in the 80-500Hz region I would address with tuned pressure traps in high pressure regions.
• Assess how lively the room sounds and address HF over attenuation as needed.

Broadband Absorption = 3.5" Safe-n-sound with 3.5" air gap.

Pressure Traps = Something similar to Ethan Winer's design found here

PHOTOS!!!

I'm not a photographer or videographer or editor but theres music and photos.

Total time invested with editing and movie creation ,<1hr so bear that in mind.

Music: Adventure Club Collect Call.

Soffits going in.... Made a big ole mess over the holiday.

Still working with soffits.... Heres a 360 shot of the room lighting needs work but I like this panarama 360 stuff its useful if you don't have a fisheye lens or wide angle and want to convey a wide viewing angle.....


http://photosynth.net/view.aspx?cid=610cbb40-c9c7-4828-82e0-9504639972a6&m=false&i=0:0:0&c=0:0:0&z=289.541159998597&d=1.80030253120205:2.76536490492398:1.74375056396825&p=0:0&t=False

You know that point in a big project when your tired of working on it? I just got there. Im over this!!!! The angled ceiling added a huge amout of difficulty.

Anyways all soffits are constructed. Half the wiring and fixtures are done. Still have the fabric panels to make and upholster and then the crown molding.







Edited by NicksHitachi - 12/1/12 at 5:11pm