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Discussion
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Recently I updated my theater to a Dolby Atmos System. Adding this really made a huge difference in my system. For example, watching the opening scene of Ford vs. Ferrari will never be the same. The cars and announcers come overhead, sounds like you are right at the race.
But since I created my high efficiency Klipsch THX clones, normal in-celling speakers, just weren’t going to to cut it anymore. Enter in the Eminence Beta 10cx. A 10″ driver that allows you to add any TPI compression driver to turn it into a coaxial.
I already had a few JBL D220ti’s and Eminence sent me some F110m-4 drivers. SO I decided to give them both a try. in the Atmos build.
Box Design
The box is a simple 14x14x7 box using 3/4″ material. With the woofer cutout directly in the center. The coaxial driver just screws on to the back. One thing to keep in mind is where to put the terminal cup. If you plan to put it on the back, try offsetting it. I offset mine toward the bottom. If you do not do this, the compression driver could get in the way of the terminal cup.
Parts Used
10″ woofer: https://bit.ly/beta10cx
JBL Compression Tweeter: https://bit.ly/220ti or
Eminence Compression Tweeter: https://bit.ly/2HpGbCc
Circle Terminal Cup: http://bit.ly/3ba9hiV
Crossover Design
Both crossovers are fairly similar. The use a second order on the woofer and compression driver. The compression driver also has a notch filter to even out the on axis response. Also keep in mind that the tweeter does have reverse polarity.
Results
The Eminence is voiced more toward a natural roll-off. This gives it a nice easy to listen to speaker, but can lack some of the high frequencies that some really enjoy. However, this also makes the speaker easier to listen to for longer periods of time. I have found this especially enjoyable for home theater and listening to Jazz.
The JBL is voiced more toward a flat response. This gives it higher highs, but can also be a little less forgiving when listening to it. However, it does really well during music. So if you tend to listen to more music then movies, this might be the one you want to go with.
Cut List
This box should be made from 3/4″ material. You can cut these any way you want, but here is one way you could cut the pieces. If you do not have a table saw, your local big box store should be able to cut these for you.
1. (2) 14×14 pieces
2. (2) 14×5.5
3. (2) 12.5 x 5.5
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Eminence Surround/Atmos Speaker Build
updated 1 month, 1 week ago 13 Members · 38 Replies
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Oops. I forgot to answer the first question. Yes they would work well as on wall surrounds.
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Really? That long?!? This shipping on components is starting to get a little ridiculous. Having said that Parts Express did just get some buyout 2.0mH that would work or the super expensive 2.0mH by ERSE. And you can always just get two 1.0mH and sur them in series, but the layout will be trickier
I waited a similar period of time for the iron cores in the KL-650’s crossover. I’m not in a huge hurry or I might jump on the bobbin cores you linked. Is 22ga enough for 150 Watts? Never mind, I see they state 175W. Maybe I will go ahead and get these instead of waiting. Thanks for the link!
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Could you build these and put them behind the drywall in the ceiling? If so, id there a special way to set up the opening so that looks flush?
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@psm16 Youc an definitely do that. You will just need to make sure you have enough space between your joists (height and width) If you do, then you will be golden. You will end up attaching the box to your joists. Exactly how you want to do that, is up to you. But if you do that correctly it’ll be even with your drywall. Then you can fill the minor gaps between the dryall and the box with something like caulk. Once painted it should be fairly seamless.
Another option would be to buy a 1/4″ thick piece of drywall recess the driver 1/4″ less than you normally would. Add the 1/4″ drywall to the outside of the box. Once it is in place, you can finish your drywall seams link normal. If you want the speaker to be covered, I would recommend making something out of white spandex or speaker grill cloth.
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Would there be much mods done to the crossover if you downsized to the Beta-8CX? I don’t know I have the room for the 10CX.
Looking at the TS parameters the look similar
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Just to be sure, I’d try modelling the enclosure in winISD and seeing how the smaller driver differs to the larger original one.
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can I use them as Front LCR with the JBL for music and movies ??
