Javs' DIY Dolby Atmos MKII Modules - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 18 Old 03-24-2016, 07:52 PM - Thread Starter
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Javs' DIY Dolby Atmos MKII Modules

Hey Guys,

Finally finished my second set of Atmos modules I am calling the Javs MKII Atmos Modules.

I have posted this into over in the Dolby Atmos Module thread but wanted to have my own separate thread to keep all the info in one easy to find place in case anybody wants to follow the design and has questions.

They are essentially based on the Triad Atmos modules. This first set I built can be found here, they used 4x Peerless 3inch full range drivers, and they were great but I felt they lacked some dynamics and the top end of the drivers was not overly impressive especially in timberal matching and more importantly sensitivity to my AMT LCR speakers I have. But if people want to build those boxes they are probably quite good for users who have a HiFi system and want to have a go at DIY... no crossover required.

So for the MKII's I went with 4x 4" Faital 4FE32 drivers wired series parallel in box in a 2x2 configuration. The baffles are angled at 30 degrees.

Here is the box model.



It is roughly a 7.6L box, however as the baffle is internal and angled, the actual internal box space is at best guess maybe 4L internal. Actually a pretty decent sized enclosure for an Atmos module.

97db/watt net (4 drivers) meaning 120watts of power will net you ~115db. You will definitely need to cross them in the amp's internal crossover settings at 150hz so they don't hit Xmax under those conditions though.

Driver: http://www.parts-express.com/faitalp...-ohm--294-1121





Here is the cutting list and build info:

You will need the following to make one box:

285 x 200mm x 4 (Sides)

285 x 249mm x 1 (Bottom) If you use thicker or thinner wood you will need to revise the top baffle and bottom piece sizes. FYI 249mm is exactly 285mm minus 2x wood thickness.

285 x 249mm x 1 (Angled Baffle) Then mitre cut the short edges to 30 degrees opposing.

48 x 249mm x 2 (Lower Baffle Support pieces) Have a look at my images of the box, these sit at the bottom of the baffle and gives you a step. You glue both pieces together, then glue the angled baffle to the top of one piece. If we did not have this piece and had the angles baffle go all the way to the bottom, depending how you mount the lower woofers would not shoot out of the box they would hit the wall, you would also not have a nice flat step to put acoustic foam..



I used 25mm Acoustic foam on this one, given the size of this box, I would have preferred something like 35mm foam as it would fit a little nicer. My earlier Atmos module was supposedly the same foam, but its actually more like 35mm which is odd because I bought the new stuff from the same shop, guess its a different batch which sucks because I like the old stuff better.

More build pics:





And finally the finished units:







As for the sound, It's pretty amazing to be honest! DTS:X is particularly impressive not to mention DTS:Neural X, as there is just so much more going on up there with the DTS:X variants I find it far superior to Dolby Atmos. Star Wars Episode VII in DTS:Neural X is a bench mark experience on my system so far. There is such phenomenal spacial sampling of the audio tracks that I was convinced at times I was listening to a native object based sound track.

I had my last Atmos modules running (Only two of them + 2x Rear Height Channels) for probably over a month and they were pretty good, the effect most certainly worked, but I was never 100% happy with the tone of the sound, and the effectiveness of the Atmos effect, I put it down to modules maybe not being so great as a solution and I would just have to live with it. But these new units are leaps and bounds superior over those. I can honestly say in this room with these modules, I wouldn't even bother with in ceiling even if I had the choice to do it (I am renting). I have heard a properly set up Klipsch THX Ultra 2 system in a well sized demonstration room with Atmos in ceiling speakers and this set up does not sound lacking at all compared to that. They are comparable and sufficient as a solution.

The effect is now so pronounced that I most definitely can hear pin point audio coming from exact locations on my ceiling, not kind of sounds like its coming from there but there is definitely very clear and detailed sounds coming from my ceiling. Pans and sweeps move around my ceiling as they should, there is absolutely an enveloping bubble of sound around me now whereas before it sounded like a combination of audio coming from the boxes but also bouncing off the ceiling.

I have the four modules dialled in so the fronts are reflecting about 50cm forward of the MLP on the ceiling and the rears are probably about 20cm behind the MLP on the ceiling. Very precise locations which it is definitely worth spending the time dialling them in.

Anyway so there it is
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Last edited by Javs; 03-24-2016 at 08:14 PM.
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post #2 of 18 Old 03-24-2016, 08:09 PM - Thread Starter
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Oh and here are a few MKI vs MKII comparison pics... Pretty big size differences, and pretty big sound differences too.





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post #3 of 18 Old 03-24-2016, 09:28 PM
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Very nice write up...and nice job putting them together....they look great.
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post #4 of 18 Old 03-24-2016, 09:43 PM - Thread Starter
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Quote:
Originally Posted by kevings View Post
Very nice write up...and nice job putting them together....they look great.
Thanks very much

By the way, I meant to comment on your thread, I love your sub build... I am going to build two of those when I move house. Cant wait. ULF is the only thing lacking in my system now.

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post #5 of 18 Old 03-25-2016, 03:49 AM
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Congrats, what a quality built!!
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post #6 of 18 Old 03-25-2016, 04:03 AM
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I see they are flat to 150-200Hz...Is there any specification from dolby for the minimum frequency you should cut atmos speakers?
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post #7 of 18 Old 03-25-2016, 04:06 AM - Thread Starter
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Quote:
Originally Posted by rggomez View Post
I see they are flat to 150-200Hz...Is there any specification from dolby for the minimum frequency you should cut atmos speakers?
No, not at all.

For modules, I would not want them to go lower. Higher freq's bounce better off ceilings as they are more directed. Lower freqs become omni directional and radiate from the box more than being directed.

A full range in ceiling speaker however would be fine, but for modules even if they were full range I would cross them at 150hz to ensure that the bulk of what I am hearing is actually bouncing off the ceiling not leaking out over the sides of the box.

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post #8 of 18 Old 05-29-2016, 04:29 PM
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Omg how did i miss this........ Great work Javs I want me a pair.

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post #9 of 18 Old 01-01-2017, 02:28 AM
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@Javs Great Thread... How did I miss this?!

I have the ability to ceiling mount them...... would you use a FLAT (regular) baffle or change the angle in a similar design?

Thanks
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post #10 of 18 Old 01-01-2017, 07:13 AM
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Nice build, my guess is no acoustic treatments at first reflection points on the ceiling ? I love build threads, thats one clean looking build. So the net is 8ohms series/parallel, pretty cool !!

As of Feb 20th still looking for a Marantz SR7010
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post #11 of 18 Old 01-08-2017, 08:08 AM
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I've had mines for over a month & i also heard in ceiling setup........ There no way I'm missing anything. I'm just waiting to upgrade my Avr to DTS-X.
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post #12 of 18 Old 01-08-2017, 11:21 AM - Thread Starter
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Quote:
Originally Posted by Nexgen76 View Post
I've had mines for over a month & i also heard in ceiling setup........ There no way I'm missing anything. I'm just waiting to upgrade my Avr to DTS-X.


Nice man they look sick!

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post #13 of 18 Old 04-10-2017, 11:16 AM
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Quote:
Originally Posted by Javs View Post
Nice man they look sick!

Hey I'm still trying to fine tune mines.....So XO still at 150hz or that's flexible to one setup ?

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post #14 of 18 Old 04-10-2017, 02:29 PM - Thread Starter
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Quote:
Originally Posted by Nexgen76 View Post
Hey I'm still trying to fine tune mines.....So XO still at 150hz or that's flexible to one setup ?


Yeah 120 is also safe.

You could also try 80, but then at reference levels you may start approaching xmax. Check the plot for this design in the first post and you will see.

My AVR sometimes tries to set them to 80.

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post #15 of 18 Old 04-10-2017, 06:36 PM
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Javs, could the aura ns3 work in this type of config?

Sent from my SM-N900V using Tapatalk
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post #16 of 18 Old 04-10-2017, 06:44 PM - Thread Starter
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Javs, could the aura ns3 work in this type of config?

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Sensitivity is only 80db, 20w RMS and 80w MAX.

You would need 10x more amp/design power to match the same volume output as the Faitals since they are over 90db sensitivity. I think those drivers would be really stressing by the time you approached reference levels and not such a good idea since we need to run these modules a little hot for them to be at a good volume by the time they hit your ears, so you would be pushing over ref levels if you want close to ref volume.

I say stick to higher sensitivity drivers > 90db if poss.

Faitals in RED, Aura in Yellow.

You can only throw 80w at the Auras once you have four in a box. Thats RMS anyway. The Faitals can take 120, combined with much higher sensitivity you get a lot more output.

Not bad Xmax on the Aura though. Xmech on the Faital is over 6mm so I think my design in that box, sealed can take pretty much anything at 120w and it will be safe.

Faital maxes out at 3.61mm excursion in this design, with an advertised Xmax of 2.73mm. I think it would be safe given the Xmech. But I would, and do still cross them at 120hz now actually.




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post #17 of 18 Old 02-17-2018, 11:28 AM
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Can you ceiling mount those? I am planning diy surround overhead in my theater, currently in framing stage so i can include brackets in ceiling joist
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post #18 of 18 Old 01-17-2019, 02:44 PM
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Hi Javs,

I just want to thank you very much for this very useful, helpful and understandable thread. I'm a newbie DIYer and jump into AVS for finding some useful info about Dolby Atmos speaker, for weeks I read all threads, messages one by one. I had so many questions to ask about box size, XO, best choice of speakers, frequency... And honestly I sent some PM to gurus of this forum but no one didn't want to help because of they are very professional and they don't want to waste of their time by listening the same stupid newbie questions again and again. In my side as a newbie ofcourse reading and collect all answers from thousands of page also not so easy and nice.

And finally I found your massages at the end of the pages of Dolby atmos DIY topic and jump to your this thread. Awesome, great, pure and clear sharing of your experience, thank you so much for sharing your DIY with people who really needs in a understandable way. The guys on Dolby atmos DIY thread really worked so hard on their brainstorm for years but with Volts they couldn't get what they desired. But you really get what you want with this DIY.

Thanx once again for sharing!
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