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Discussion Starter · #1 · (Edited)
I have been collecting parts for the last several years and been dealing with some waxing and waning motivation (2 young kids, busy job, marital stress/obligations etc) but I am finally forging ahead working on a semi-dedicated home theater with (hopefully) a nice set of speakers going in.

LCR will be custom cabinets, custom passive crossovers (still need to sort out actually doing that), and will house acoustic elegance TD12Ms with Apollo upgrade and Beyma TPL-150Hs. I have the cabinet design complete and need to start cutting the wood.

The six surrounds will be custom cabinets, passive crossovers, and will contain acoustic elegance TD8Ms with Apollo and Peerless XT25TG30s in SEOS 8 waveguides.

The six Atmos in ceiling speakers I am currently working on are Volt 6 v2 in some custom cabinets.

I have 4 SI HST18s I will put in some custom sealed cabinets.

Electronics will mostly be an Emotiva XMC-2 (got in on the upgrade price which was nice) some older emotiva amplifiers, and a couple of speaker power amplifiers from Seaton (SP2-8K I think)

Attached are some pictures of the room. Luckily I have an attic above and behind this room so everything is somewhat accessible. I have run 12g wire to the LCR positions, 14g to the surrounds and I still need to run 16g to the Atmos positions. I ran 10g to the subwoofer locations. With each speaker run I also included coax and cat6 just in case.


 

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Discussion Starter · #2 ·
Before starting the speakers I needed to build a CNC to make the boxes. I did an MPCNC with about 24” by 35” cutting area. For those of you unfamiliar this is basically a DIY CNC with stainless conduit and 3D printed fittings. It’s pretty slow but so far getting the job done. In the near future I will be getting a much larger CNC that can process an entire sheet of plywood.

These are some shots of a couple panels being processed

 

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Discussion Starter · #3 ·
I will post some shots of the 3D renderings I made for the speaker cabinets when I get home. I have cut the prototype cabinet for the Atmos speakers and everything looks/sounds good. I just need to cut the parts for the other 5 now.

The box is cylindrical with an internal volume of 0.5cf per DIYSG recommendations. There is a magnetic grill that will be covered in grill cloth. These will be flush mounted into the ceiling screwed to some of the joists through the attic.

 

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Excited to see your results.
I’ve been considering that woofer and tweeter combo for a vertical center.
Will you be running active or passive?
Edit: Apparently I fail reading comprehension. I see now you said custom passives.

Chris
 

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Discussion Starter · #6 · (Edited)
Excited to see your results.
I’ve been considering that woofer and tweeter combo for a vertical center.
Will you be running active or passive?
Edit: Apparently I fail reading comprehension. I see now you said custom passives.

Chris


Initially I wanted to run active but it just became too complicated. I have been apprehensive about designing passive crossovers for some time though so I figure it will be a good learning opportunity if nothing else.
 

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Discussion Starter · #7 ·
Looking good, how much are they going to weigh when finished?


The Atmos enclosures aren’t too bad. I haven’t weighed them but they are lighter than I thought they would be. The walls are 3/4 inch thick mdf with 4 1/4 inch birch alignment dowels running the length of the box. The baffle is mdf with a layer of Baltic birch underneath (I was going to do an all birch baffle but my cnc just has a harder time with it given it is not very stiff - plastic fittings and all). The rear of the speaker is also Baltic birch. I would say, without drivers they weigh 10lb

I have no idea how much the other speakers are going to weigh. The subwoofer enclosure is designed with 1.5 inch walls and its 32 inches x 20 x 24, or something close to that. It will be heavy
 

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A lot of people have had problems with Emotiva processors, past and present. Does the XMC-2 even boot? and if it boots, does it actually lock onto HDMI signals (for the whole movie / day), or does it send random fully clipped noise out every output or what?

I had a UMC-1 back in 09, and it was nothing but problem after problem. They never fixed all the user issues, just like with the XMC-1 they just abandon users after a while to make a new unit with new problems. LOL!

Have they made any progress in the last 10 years or huh?

I was too scared to buy an RMC-1 when it first came out (and still am), and just stuck with a Marantz processor instead, absolutely zero problem here. No glitches or lockup, decodes exactly what it should when it should.
Ain't got no time to bleed. hehe! :p
 

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Discussion Starter · #9 ·
A lot of people have had problems with Emotiva processors, past and present. Does the XMC-2 even boot? and if it boots, does it actually lock onto HDMI signals (for the whole movie / day), or does it send random fully clipped noise out every output or what?



I had a UMC-1 back in 09, and it was nothing but problem after problem. They never fixed all the user issues, just like with the XMC-1 they just abandon users after a while to make a new unit with new problems. LOL!



Have they made any progress in the last 10 years or huh?



I was too scared to buy an RMC-1 when it first came out (and still am), and just stuck with a Marantz processor instead, absolutely zero problem here. No glitches or lockup, decodes exactly what it should when it should.

Ain't got no time to bleed. hehe! :p


I’m not sure, I don’t have it yet. I bought the XMC-1 years ago and, frankly, I never really used it. Kind of a waste of money I just had plans to do this project for a long time and never was able to find the time to do it. The xmc-2 was just released and they did a pretty good price for the upgrade from the 1 to 2. I figure if it doesn’t work I can sell it and get a marantz.

So far the reviews of the xmc-2 are ok but I know what you mean about emotiva. Their track record with processors has been bumpy at best. The amps used to be good value but they seemed to consistently reduce the quality and increase the price over the last several years. I ran a UMC-200 for several years. I had one issue with it that I had to send it in for repair for. They took care of it and it still works well today. I run an XSP-1 (I think that’s the model) at my office and it has run flawlessly for years, although it’s just a stereo preamp.
 

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Discussion Starter · #10 ·
Cabinet Renderings

Here are the renderings for the speaker cabinets. Pretty straight forward except I'm going to go through quite a few sheets of MDF
 

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Discussion Starter · #11 ·
Making some dust today. I have to cut out 70 rings for the volt 6 Atmos bodies. Also some pics of the Volt 6 crossovers. I’m impressed with DIYSG their kits are well packaged and crossovers are pretty foolproof to put together.

 

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Discussion Starter · #13 · (Edited)
Got some parts cut. 70 rings for the bodies, 5 baffles, grills, trim rings, and backs. Tomorrow I will try to get everything separated from the tabs and start getting epoxy on the magnets. Still have to cut the birch mounting rings which I will do manually (the cnc doesn’t do as well with birch) and then glue ups, paint, and grill cloth.

Any feedback or thoughts is appreciated

 

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Not to be critical of cnc fun, but you can save a lot of time and money by using sonotube for the round enclosures and kerfed (or laminated thin) sheet for the sides of the curved enclosures.
Good luck and have fun either way.
 

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Loving this build so far!
 
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I have to say that you aren't afraid of a little dust. HAHA. How many lbs. of mdf dust have you collected.


I do love your ideas and once done will have a great system. Keep posting your pics along the way.
 

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Discussion Starter · #17 ·
Not to be critical of cnc fun, but you can save a lot of time and money by using sonotube for the round enclosures and kerfed (or laminated thin) sheet for the sides of the curved enclosures.
Good luck and have fun either way.
I have never worked with sonotube before but to be quite honest I never considered it for this. It probably would have been much easier. It has never felt right to me building an enclosure out of cardboard but MDF isn't much different. I will call these a practice for the larger surrounds, FCR, and subwoofer builds coming up.
 

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Discussion Starter · #18 ·
I have to say that you aren't afraid of a little dust. HAHA. How many lbs. of mdf dust have you collected.


I do love your ideas and once done will have a great system. Keep posting your pics along the way.
So far I have emptied my dust collector bin twice! That's 60 gallons of compacted MDF dust.

I really need to figure out a dust collection strategy for this CNC, my shop is a mess.
 

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Wow!
 
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Before starting the speakers I needed to build a CNC to make the boxes.

Now that right there is something I swear, I never thought I'd hear! :eek: This dude means business.....I like it!
 
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