Eminence Surround/Atmos Speaker Build
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.
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.
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
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.
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.
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) 14x14 pieces
2. (2) 14x5.5
3. (2) 12.5 x 5.5
Okay, here it is. I'm planning to build some new surrounds using the Eminence beta 10cx and a compression tweeter. I might use the JBL one I used in the Klipsch clone build or the Eminence F110M-8. Here's some pictures of the Eminence drivers.
I have some experience with the beta 10cx, coaxial, looking forward to your build.
I first tried the ASD1001, and now am using the selenium d220ti drivers in a zu druid style floor standing box.
I'll be interested to see your crossover approach. I've tried so far a simple cap on the tweeter, a clone of the eminence circuit ~2500hz(PX-Bll 2K5CX), and most recently Michael Chuas Osprey2 3rd order crossover @1500hz.
Overall It's a really fun sounding speaker but suffers from some of the expected beaming with the coax design.
Testing them out with the F100M. I do like them, but it think I may switch to the D220ti like @escoffee used. I've already designed this crossover, so I may do the d220 later. Luckily this is so easy to switch it the compression driver.
I went ahead and tested the F110M-8 in the Beta 10cx. It actually performs better than I thought it would. I still want to test the D220ti and compare them side by side. I'll get final measurements to you guys as well as the crossover when finished. Here's the review video of the F110
When I cut the boxes, I cut them about 1/4" shallower than I needed. I made up for this by attaching a nice 1/3" sheet of Baltic Birch on it. Then clear coated it with Verathane water base. I like the water base, as it will stay clear. An oil based polyurethane will yellow over time.
updated with cut list, let me know if I forgot anything
Does Eminence have their FRD and ZMA files listed? Was thinking of trying another one of the compression drivers.
Haven't had much luck finding the actual files, but if you go find the driver on Parts Express' new website, scroll toward the bottom and click "Manuals and Resources" and select the Specifications PDF, it will show a graph of the frequency and impedance sweeps. Download that. Then do a search on the forum for "graph tracer" and you'll find another post where we talked about some that are out there. Download the one that Nick (Toid) reccomends and you can create the files from there.
Hey 123Toid, I want to build these for my 4 surround speakers, I built your kl-650 clones for the 3 fronts ( I'm the guy that built the horizontal kl-650 as a center) , i was wondering if i could make them ported, if so what size box would be good and would the crossover have to change ?
Hey 123toid, what do these sound like? How efficient are they ? Would they match well if i were to use them as my 4 surround in conjunction with my klipsch kl-650 clones as the front sound stage....
Yeah these sound great for surround with the Klipsch. I actually used the design with the Eminence for my center channel for a long time. I rally enjoyed it's warmth.
If you want to port it, I would build a total box volume of around 1.625 cubic feet and use two 3" ports that are each a total of 3.5 long.
Ok thanks, i might just build them very soon, 4 of them to start off, and if I like them I'll build 4 more for atmos. If i were to make the ports rectangle what would be the size and length instead of two 3" ports ? Many thanks..
Would i really benefit from having them ported since they will be working surround duty...hmmm need to make up my mind before starting the build.