Another Erskine-designed masterpiece (if I don't screw it up). - Page 8

I like what I'm seeing so far...makes me wish I had used Dennis for plans! Regarding your projector, I'm sure you've seen this before, but seriously - do NOT mount it or even think about putting it on a table, etc before you are actually DONE. I'm one of many who has about 3 or 4 punch list items that never did get finished because I mounted mine and started using the theater regularly. It's not that there's anything missing in my HT, but those last few things would make it better. One of these days I'll actually finish. Fortunately, nobody knows except me.

I was thinking the same thing.

Anymore pictures of your walls with all the treatments on there?

Nice shot across the bow. Not the case however...no triple leaf.

Looks like there is a drywalled exterior wall ana wood framed/drywall wall inside of the wall which is a double leaf wall, is it not?

Which images are you referring to?

Not the baffle wall, but the side walls, the pictures posted on 10-31-11, 05:27 PM show a view of the side walls with paper faced batt insulation between wood framing studs and then the picture below shows drywall on the wall.

I left a tube of green glue outsidelast night and it froze, can I thaw it and use it or should I throw it away?

There is sufficient space back there so as not to constitute a triple leaf with respect to the new side walls.

Thaw and bring the GG back to room temp and use

You still have a triple leaf wall construction, you have a cavity depth for the exterior wall which will resonate based on the depth of the wall + you have another wall cavity which will resonate based on this second cavity depth, you will end up with a gain for 2 different frequencies for the side walls.

If the space for the first leaf (interior wall) is great than the exterior wall then this space will resonate at a lower frequency than the outer wall

...then by extension, every playback space inside a residence will have at least 2 triple leaf walls. Therefore, all playback spaces shall hence forth be constructed in stand alone, dedicated structures and not be incorporated into an existing multi-room building. So, your home work assignment is to calculate the resonance frequency of each triple leaf, the energy in that resonance cavity, calculate the damping and absorption of each element and determine the resultant change in TL as a result for each wall.

Not a Triple Leaf from a practical situation, just as Dennis said. Put a 6" or less air cavity next to the first, and you'll start measuring an effect. That gap in that little hallway is 24" at least.

WOW, that's quite the cavity, should visit your friendly neighbourhood denisty more often!!

Would the formulas from the attached doucment suffice...??

Didn't appear fom the photos that there was a 24" space between the walls, photos are deceiving thats why I asked the question...but I thought you would not install the DW on the exterior side.
Attachment 236416

Attachment 236417
The renosance of a 24" deep cavity, off the top of my head would be around 30-35hz.

So in simpy terms, if a double seperate wall cavity depth is such that it resonates at say 40hz, would it attenuate all frequencies above 40hz and any frequenices below would be heard on the otherside of the wall?

 

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nrcc43676.pdf 214.65625k . file

WOW Great looking HT!!

Thanks for posting all the pics and info.

I'm local..but scared see it.as I'll be ruined .. OK PM meruin me LOL

I'm buying a new place in Frisco with a 20' x 20' second floor media room, can't wait to hire Dennis to design it....soon

I would suspect that it would all depend on: (a) just exactly what the construction of wall one is; (b) what is inside the cavity; and, (c) more to the point, what the construction and design of wall two is.

Actually, I don't really suspect that, I rather know that plays a very significant role in the overall performance of a low TL structure.

Now, in the interest of courtesy to Mr. KBLAW, perhaps you should start a thread specifically on this topic. Make sense?

Hey, your right, sorry KBLAW, this is your thread, by the way your room is looking great so far, looking forward for more progress photos.

Just to finish up this sidebar convo, at low frequencies (30-40Hz) the two framed walls in question will act as single mass leaves. Below a wall's Mass-Air-Mass resonance point, the decoupled wall is re-coupled via the air. It's air-coupled. Our advantage of decoupling is gone.

By the time we get down to a 50Hz signal, the two boundary walls would have already been air-coupled and a LF sound wave would perceive that wall as a double wall, with essentially two solid leaves and a 24' (whatever) cavity in between. For a sound wave that large, there is no functional triple leaf.

KBLAW, thanks for indulging us.

maybe we can continue this in the 'Soundproofing Reviews' forum?

Love it! The sconces are awesome.

I am going to set up my own "occupy" movement in your theater!!

I assume that is a 3D Runco projector - will you be using the Stewart 5D material? What type of lens sled are you considering?

Not 3D. 5D material is best for passive 3D. We only use active (so far).

Every time you post new pictures, it makes me hang my head in shame of my room. In a good way :-)

It really does make me want to build a new house..... and I've only been here for a year...


Beautiful beautiful design

Sorry, I missed this earlier. While you can purchase/integrate your own lens sled, Runco CIH projectors include an integrated sled and lens.

I guess for the price that is a good thing.
Just so I am clear, you mean the lens and sled are internal versus the external panamorph style correct?

No, they are external; but, mounted to the projector case with all the triggers and aspect ratios set up and ready to roll.