Erwin's 550 Liter LLT / 13 Hz / Maelstrm 18" - Page 8 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #71 of 77 Old 08-07-12, 05:27 AM Thread Starter
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Re: Erwin's 550 Liter LLT / 13 Hz / Maelström 18"

^Thanks!

Some progress:

The outside wall of the HT space, with the entrance. Left stud is reinforced to carry the heavy acoustic door I am planning. Inside drywall will be separate and mounted on top of the concrete floating floor.
-p8021693.jpg


Front wall of the HT. Taped joints to prevent (warm) air to escape. The exhaust air warmth is used to warm up the fresh air (without ever mixing the actual air). But such system only works if sufficient air-tightness is achieved. While one may think a plastic foil would be simpeler, this is no good since we need a "breathing" structure. Damp from the inside air can and should go through the structure. The celit 3D on the outside (behind the cladding) is very damp-open. This results in a healthy interior atmosphere, while retaining a dry (thus longevity) building structure...
-p8021695.jpg


We also made the dividing wall between the kids rooms. Both have a small bathroom with toilet. The suspended toilet supporting frame fits inside the wood frame, which explains the thickness of this wood frame. The wall will be completed later.
-p8031697.jpg


And lastly, we attached the foil below the (flat) roof structure. Unlike the walls, a flat roof is covered with a sealed membrane (duh!), the EPDM, which prevents humidity to escape from the structure. This may cause rot in the long run. But the foil (intello+) is very special indeed. During Winter, it is very resistant for damp to pass through. But during Summer, it is more "open" thus letting the damp that might have entered the structure regardless of the taken approach, is being transferred back to the interior, where it is easily ventilated (being Summer). My 17yo son helped a good deal as you can see, even during this Sunday. The wood (1x2") is mainly to support the weight of the blown in thermal insulation. We only did 1/2 since we didn't have the whole day.
-p8051706.jpg


BTW: I am thinking of adding an extra floating wooden floor on top of the concrete, as a passive bass shaker... Any info/suggestions are appreciated! Hard to find info.

Slowly building a 9.2.4 HT with 3 DIYSG Titan LX LCR, 2 LLT subs (done) and much, much more...
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post #72 of 77 Old 08-27-12, 09:26 AM Thread Starter
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Re: Erwin's 550 Liter LLT / 13 Hz / Maelström 18"

Homecinema14.4_90.pdf

I turned over my HT design once more. 90° to be precise!

The screen actually divides the room in a HT+diner section and a kitchen corner. So when someone is doing something in the kitchen with lights on, it will be les disruptive for the viewer enjoying a movie in the dark.

The DIY subs behind the screen can be turned around and backfire to the kitchen. This leaves their whole "frontside" free to apply acoustic treatment.

The center can now be the exact same tower as the L+R Front. It's the garganteous DIY DTQWT-12 designed by Troels Gravesen. Left-over space can be filled with fiberglass as broadband absorption.

The L/R Side Surrounds can now be at their ideal 90° off axis position (they were about at 110° before). They're now somewhat closer to MLP, but still at decent distance.

The diner/breakfast table can now be put against the back of the seats. The garden is still in sight when the curtains are open while the screen can also be viewed.

Nothing but good except for the back door to the terrace now being in a less than ideal position. It should have been in the corner. Now it is harder to get to that door and also forces the Back Surrounds a bit wider then I'd like. But I cannot change that since the frame is already in place.

That's five improvements for one drawback. I think I will do it!

BTW, note the three extra Top Surrounds making it 14.4
See Dolby® Atmos™ for that.

Slowly building a 9.2.4 HT with 3 DIYSG Titan LX LCR, 2 LLT subs (done) and much, much more...
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post #73 of 77 Old 09-10-12, 04:32 AM Thread Starter
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Re: Erwin's 550 Liter LLT / 13 Hz / Maelström 18"

I ordered the four Eminence Deltalite II 2510 woofers that were still missing to have a complete kit for the first pair of DTQWT speakers (design Troels Gravesen). These large floorstanders are going to be used foor Surround, Back Surround and Wide. Thanks to my recent idea, only after three years of tweaking the room layout, to turn the layout by 90° (floor plan in previous post) it is now possible to use the identical tower for Center. The two Maelström LLT's and the Center are situated inside a acoustic transparent freestanding structure with the CIH AT screen attached to that. Those LCR will be the big brother version of the other towers. The DTQWT-12 use two 12" each for bass and are 5 feet tall. But let me start to make the first "normal" pair and take things from there.

I aim to make the front and rear baffles less prone to resonance by using Green Glue as you can see in the attachment. The top and sides of the cabinet will be black coloured MDF and everything is to be finished with black (vegetable sourced) oil. The advantage of that is firstly the oil is far less reflective than gloss paint and if the black MDF is scratched, it's still black below the surface.

49 A3 Speaker DTQWT-10 1_5.pdf

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post #74 of 77 Old 09-10-12, 05:33 AM Thread Starter
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Re: Erwin's HT Floorplan 14.4

After e-mailing with an acoustician I tweaked the design some more. I will take this floorplan and discuss it with him next week. After I completed the bare "room-in-room" (floating concrete floor and double drywall construction with Green Glue) he will come over and measure the reverberances of the room and then he will design the (DIY) room treatments. It's the same man that helped Philip, so I have high hopes since he has a bias for diffusion (as opposed to absorption) which results in superb looking "Zen" rooms:
http://www.hometheatershack.com/foru...er-dreams.html

His commercial name is SoundscapeS. He suggested to me that the thick (12") wood frame of the house build, filled with cellulose thermal insulation is very favourable for inherent bass absorption as opposed to concrete or brick. That's good to hear as I suspected this but had no proof to back it up. We will see how it performs when he measures.

I also added the Stressles® Homecinema seats I saw in Akto's HT. I am sure he doesn't mind... We need 4 seats and the misses orders a loveseat in the center. As the seating is angled by the armrests (22.5° I presume) I changed the diner table behind it to have more circulation space. I chose screenwidth (11 feet) = viewing distance for that immersive feeling. Moved the additional subs 3+4 to make room for a breakfast table.
Akto's Purple HT:
http://www.hometheatershack.com/foru...e-theater.html

Floorplan:
Homecinema14.4Surround.pdf

Slowly building a 9.2.4 HT with 3 DIYSG Titan LX LCR, 2 LLT subs (done) and much, much more...
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post #75 of 77 Old 08-18-14, 04:10 PM Thread Starter
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Re: Erwin's 550 Liter LLT / 13 Hz / Maelström 18"

Finally some movement in the HT build. I have been constantly changing my designs for it over the years. The floating concrete floor was installed in July and my son and I put in all the blow-in thermal insulation earlier this month.

The final drawings (big) can be downloaded here:

http://emotivalounge.proboards.com/t...crollTo=663990

I can see from the design in the last post (2 years old!) that I was already fascinated by Dolby Atmos then. Needles to say, the introduction of consumer Atmos put me on fire.

Or download direct from Sendspace (this only works for a limited time)

http://www.sendspace.com/filegroup/n...fx9F2kqJTQGxSU

https://www.sendspace.com/file/7rfjf7

https://www.sendspace.com/delete/7rf...13735a526207bd

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Last edited by erwinbel; 08-18-14 at 04:27 PM.
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post #76 of 77 Old 08-09-15, 06:17 PM Thread Starter
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Re: Erwin's 550 Liter LLT / 13 Hz / Maelström 18"

Update on the slowest build thread ever. The room is nearing completion and the center speaker is ready to install the drivers.

Center Speaker

I made ceiling absorbers of the heaviest rock wool with 12 cm thickness with 7,5 cm space. These should work down to 125 Hz, I hope...
The gaps are for Top speakers and lighting.
Further there's the central element that will hold the center speaker and the AT screen. Both subs are rear firing and will be put inside this structure.

Ceiling Absorption

Next weekend I plan to attach the actual screen holding structure, fill it with rock wool. Also put the drivers in the center and connect the wires.

I have a miniDSP 2x8 with box for the crossover but I might have ordered wrong as I don't see a way to attach the USB connector. I have put a post on the forum at miniDSP to find out what's missing.
Attached Thumbnails
-p7149521.jpg  

-p8089795.jpg  


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post #77 of 77 Old 01-29-17, 07:29 AM Thread Starter
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WTB: Maelström 18"

Decided to abort the SEOS-24 LCR build as I lack the knowledge to make it sound as good as it could be. The miniDSP 4x10HD I used is also not considered the best tool as it is to noisy for such high sensitivity coax as the BMC 4594.

I will build 3 of the new DIYSG Titan LX instead. The kits are very affordable ($520) and I still get three-way constant directivity horn speakers this way.

Anyway, the real reason for this post is that the Emotiva RMC-1 I have in sight allows for 3 subs. So I would like to add a third one, preferably identical to the LLT. Hence I want to buy one 18" Maelström. Anyone has one sitting unused in a box somewhere? Shipping would be to my ReShip address in Oregon, so no worries about extra paperwork, they handle all that.

If I cannot find one, I'd use another woofer of course.

Slowly building a 9.2.4 HT with 3 DIYSG Titan LX LCR, 2 LLT subs (done) and much, much more...
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