Unusual theatre space - Page 3 - AVS Forum | Home Theater Discussions And Reviews
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post #61 of 70 Old 01-27-2019, 01:53 AM - Thread Starter
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Construction of the core structure was completed just before Christmas, with the pour of the final 50 tonnes of C40 waterproof concrete for the roof deck.








The next major operation was liquid screeding to get the floor flat on the lower level. Due to various issues during the original foundation pour, there was a variance of nearly 4". The crawlspace / rear projection tunnel in the middle is covered by a sturdy steel gantry structure (I'm continuing the rule of no wood used in this construction).









After nearly two years since we broke ground, I'm now roughly at the typical starting point for a HT build: a 24' x 24' x 9' bare underground room. There is another 6" of height in the gaps between the beams, a 16'6" wide x 6' deep screen alcove in the front wall, a 12' x 12' bar/kitchen area and a 11' x 4' bathroom area.




Lighting is currently just 12 x battery-backup LED bulkheads (handy as the crew keeps tripping the power out) and the work lights, but I've got over 100 LED strips to go in later. The 70 KW three-phase isolation transformer is emplaced but not yet commissioned (will need a steel enclosure).


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Last edited by bitphase; 01-27-2019 at 01:57 AM.
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post #62 of 70 Old 01-28-2019, 08:38 AM
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Awesome. Keep the updates coming this is going to be epic!

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post #63 of 70 Old 03-18-2019, 01:39 PM - Thread Starter
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The underfloor heating pipes are installed: approx. 420 metres of 16mm PEX-Al-PEX pipe in 6 loops and 3 zones (theatre, bar, bathroom). The steel grid over them is not for suspended floor, the channels will be embedded in the floor screed to take LED strips (with diffuser strips over).







The ceiling and walls have this construction as well; there will be 8.1 kW of installed LED lighting in total. Of course, I would expect it to be dimmed down most of the time.





Power needs are met by a dedicated supply of 415 volt, 3 phase, 300 amps. Because 120v or even 240v just doesn't cut it. There are industrial surge protectors at the main panel before the isolation transformer, power filtering will be after the isolation transformer and sub-distribution.




The Magnepan (magnetoplanar flat pannels) surround and ceiling speakers are installed: 4 x 1.7i in the walls and 4 x MMGi in the ceiling. The ceiling build up is 4mm fibre cement board, 50mm rigid foam insulation, 6mm fibre cement board, 100mm 'quiet' mineral wool, 100mm air gap. The side walls are 12mm fibre cement board, 50mm convoluted acoustic foam, 150mm plenum, 50mm convoluted foam, steel clad R/C outer wall. Floor is 250mm reinforced concrete slab, about 40mm liquid screed, 75mm rigid foam insulation, 70mm dry cement screed. All surfaces will get 3mm black rubber tiles later.







The shallow depth of the air spaces behind the Magnepans is definitely not ideal, but I didn't have any more room available, should be ok for surround channels. Sounds a bit weird ATM due to all the reflectors, but pretty cool with all channels on (the usual Magnepan super wide soundfield x 4). I've also built the shelves to hold the LR electrostatic speakers: concrete blocks and reinforced concrete shelves (small gauge rebar).


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Last edited by bitphase; 03-18-2019 at 01:49 PM.
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post #64 of 70 Old 03-18-2019, 03:22 PM
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Very interesting project. Thanks for posting the details.

Is that just some thin convoluted foam behind the Maggies? Would something more stout like OC703 absorb more of the backwave to avoid reflections? I'm just curious, you've given this a lot more thought than I have.
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post #65 of 70 Old 03-19-2019, 07:32 AM
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Quote:
The underfloor heating pipes are installed: approx. 420 metres of 16mm PEX-Al-PEX pipe in 6 loops and 3 zones (theatre, bar, bathroom). The steel grid over them is not for suspended floor, the channels will be embedded in the floor screed to take LED strips (with diffuser strips over).
You can really start to see what it will look like now - before it was a bit hard to picture. Your lighting plan is very very cool. I can't imagine the work and planning that has gone into this "facility" but it truly looks to be built on an industrial scale. Keep the updates coming I cannot wait to see how it turns out. Good on you.

Roll Tide.
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post #66 of 70 Old 10-12-2019, 08:27 AM
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post #67 of 70 Old 10-15-2019, 01:13 PM
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Seconded. Been wondering about this one.

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post #68 of 70 Old 10-20-2019, 03:47 PM
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Third that. This is insane.
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post #69 of 70 Old 10-28-2019, 06:27 PM - Thread Starter
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Sorry, I'm overdue to post some updates. Had to focus on completing the rooftop patio and bathrooms for most of this year. I had real trouble with the screen; the rear projection mirror system almost worked, but in the end I had to tear it out and scrap it. The angles were fine and I even managed to get the acrylic first surface mirrors glued flat enough that there was no visible distortion. The problem however was that those things don't have uniform reflectivity: it isn't visible to the naked eye when using it as a mirror, but it means that projected images are cloudy even if the mirror is perfectly clean. I tried a few different materials but the only solution was optical glass which would have been infeasibly expensive and hard to mount.


As such I've switched to a video wall configuration of six Optoma UHL55s (mini 4K HDR LED projectors) sitting on shelves behind the screen, each with a single small (optical glass) mirror bounce to fit into the available depth. This will produce a 12K (11520 x 4320) image with 12000 lumens of brightness, for a relatively modest outlay of ~9000 GBP in projectors, splitters and cables. I've got the hardware but it's a pain to set up; the only thing that can drive six 4K60 displays is a beefy graphics card, and my AMD Radeon Vegas only have four outputs each (and you can't use two cards to drive one Eyefinity surface even with Crossfire) so I needed a couple of displayport to HDMI splitter hubs (most of which aren't 2 x 4K60 capable). Once I've got everything aligned and working I'll take some photos and do another update. Obviously the lenses on the UHL55s aren't as good as the UHZ I was using before (now sold on eBay) but as each of them only has to cover 1/6th of the area I hope the combined image quality will be at least as good. Brightness uniformity is a concern, may have to correct for this in software, we'll see.
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post #70 of 70 Old 10-28-2019, 07:08 PM
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Interesting. Have you considered one of the offerings from Matrox to drive the projectors? https://www.matrox.com/graphics/en/p...c-series/c680/
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