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.
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