The Cinemar Home Theater Construction Thread - Page 27

I finished emptying all of the remaining sand bags into the other half of the stage. Looks like I'm about 10 bags shy. So I'll pick those up tonight and finish that phase up.

I need to zero in on the construction of the false screen wall next.

For the some of the side walls, If I'm putting one inch acoustic material on the wall, should I furring out the wall exactly 1" or should I plan for 1.25" to make sure the material doesn't push against the GOM fabric?

Another composite image I created blending reality with vision:

I decided to stick with the flat screen.
Mainly due to the costs it added.

Got around to putting in insulation in the remaining steps.

In my case, I added a few extra whisper clips in the area where the projector will hang. Then I can just screw the projector mount through the drywall and OSB.

I'm not sure what big hole you'd be making unless your are not planning on suspending it from the ceiling and planning to put it into a wall.

I happened to have been on the phone with a guy from Lowes to get more sand when I read your post. Doesn't look like they carry anything locally longer than 1 3/4". I was thinking I could just use 3" nails and some fender washers instead.

The shorter ones may work for areas where I only need 1" of material attached to the wall. The question I have is will these go into the OSB or do you just get a length long enough to drive into the drywall alone?

Anyone see an issue with me using roofing nails and fender washers? I was thinking of caulking the washer so it doesn't rattle from metal on metal.

I think the 3M spray would work for me on the first layer where the foil is against the back wall, but because of the recycled denim, I'm not sure if that would work as well when trying to attach the second layer of foil to the denim.

In my case, I just filled the stairs with insulation to prevent any resonation.

I finished putting the last 10 bags of sand into the front stage this evening. I also was able to cut all the OC703 for the front corner bass traps.

I created this makeshift cutting table out of 1/2" osb and some left over metal from my drop ceiling corner metal. The OSB grabbed the OC703 while the metal provided a nice smooth edge to run the blade along. The 2x4 gave me a nice clean 2' cut every time.





For cutting the 2x2's in half, I rigged this:


After doing about half of them, I realized it was just easier to use a straight line piece of metal at a 45 and score the OC703 with the turkey cutting knife. Then remove the metal ruler and then cut all the way through.

This entire process actually went very quickly.

I mounted a 1/2" osb shelf to set the pie shaped OC703 bass traps on. I left it 30" off the stage to allow for future subs should I ever decide to go big!



I measured it so they'd fit pretty snug up against the ceiling. Any need for me to cover them with some fabric even though they won't be seen but just to keep the fibers from separating?

I officially finished building the DBox platform. It was much more difficult to do than I thought and probably took a couple hours. Since everything is square and the bolts needs to be aligned just right, it was careful balance of tighten and loosen. Unfortunately it fell on my toe as I was putting it back in place. I'm afraid to see what it looks like, but it doesn't feel broken.

I'm also trying to finalize the screen size. I think I may go down to a 136" wide 2.35 screen. This will give me a little more room in order to squeeze the subs in and make it a little more comfortable for front row viewers.

I did a quick test with the projector to see how the sizes of 16:9 and 2.35 images will look to scale. (The Transformers 2 turned out to be 2.40)

I was able to tackle a few more items tonight.

The two layers of recycled denim were added to the top of the screen wall.

You can see how big the 50' rolls are.



I ended up just using the roofing nails and fender washers along with some 3M spray. A bit challenging to do by myself, but I was able to rig something up to hold one end while I started on the other. I put some liquid nails on the washers and head of the nail to hopefully prevent any unwanted metal on metal sounds when the room shakes.



I then tackled the water pipe sticking into the lower screen wall.

Here's what I needed to soundproof.


I framed it with 2x4's on end.



Then applied some acoustic caulk around the edges before putting on two layers of 3/4" OSB.



I have to snug my speakers against the screen wall. So I may just put another two layers of recycled denim underneath and then cutout the denim once I know for sure where I'll be putting the speakers.

Hi Larry,

The bottom wall still needs to be covered yet. I may need to do a few other things before I finish up that portion though. I'll be leaving the corners empty for now until I officially have subs though.

You caught me. I pulled a movie from my daughters recently watched list.

You didn't happen to be listening to Pink Floyd and have the audio from TinkerBell turned down did you? Well I hope your flu is on the way out and you get better soon. No fun!

Hi HFGuy,

That is correct. The subs will sit below the corner bass traps. The entire back wall, along with speakers/subs, will be hidden by decorative panels that still need to be built.

I'm holding off on the construction of the false wall until I figure out how to do the oak finish work for the steps and bullnose. I was hoping my former neighbor who built my outdoor tv/lift cabinet was going to be able to do the work but his shoulder may require surgery so I may need to find someone else. I didn't want to build the false wall yet since the OSB top serves as a great template in case someone wants to take that with them and build it in their own shop.

I may start moving to the column construction in the room.

My father-in-law was over this morning applying drywall compound to the plywood soffit to hide the grain. I had sanded it this past weekend. Although, I'm thinking it may be look better with some type of black GOM fabric. Hmmmm....

Late last night, I figured out the can spacing for the soffit. I have to move some of the electrical outlets up there in order to fit the cans that I'll be getting from Lowes. I've decided to go with 16 cans total. 4 per side. That places them strategically offset from the projector and the 3 cans above the screen.

I'm looking for some opinions. I'm deciding what to do with the soffit that holds the can lights. I'm playing with the idea of using fabric and thought maybe the same red from the walls might look good.

Which one do you guys prefer?

Original Plan was Black Paint but may switch to Fabric



Now some renders with Red: