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Old 1st December 2012, 10:21 PM   #1
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Default Eminence Coaxial Towers

Parts have arrived for the next project! I am VERY happy with the Markaudio Alpair 12.2 Pensils, but there are times when I want to put in some Zeppelin and just JAM! Unfortunately, the Alpairs don't do that well.

Enter the WLM DIVA/Zu Union clones. These utilize the Eminence Beta-10CX with some Selenium D220Ti drivers in a bass reflex tower (39Hx12Wx13D) tuned to 35Hz. They should be a great rock-n-roll point source speaker. Crossover is 2nd-order at 2500Hz with Audyn premium caps and Erse 14ga air-core inductors.

More pics forthcoming as I start building the cabinets tomorrow from my stock of 3/4" 11-ply Baltic Birch ply.

Parts for 2 sets ... a buddy bought the swag shown if I build him a set as well. Not sure how he will finish his, but I think I may paint mine with a Union Jack since they are my Zeppelin speakers.

Has anyone removed the screen from the D220Ti's? I am guessing it is there to prevent prodding fingers when mounted to a horn, but behind the dustcap, they should be safe. It is pretty thick wire, so I am concerned with dispersion.
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Last edited by craigtone; 1st December 2012 at 10:27 PM.
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Old 2nd December 2012, 04:29 AM   #2
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fun !!!!!!!!!!!
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Old 2nd December 2012, 12:00 PM   #3
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I have been thinking about an upgrade from the current full range + subs (2 way) to coax and subs (3 way) for a long time. I am particularly interested in polar response of the compression driver your using in the Eminence coax.

To eliminate the harshness you hear when you crank it you want to minimise the velocity of the driver producing upper midrange/trebbel. One way of doing is this is to make the driver very large (like a Gedlee speaker) or to use a separate driver for the lower bass, I would recommend going 3 way if the budget allows, however the coax should be a lot better than the full range due to the greater surface area.

The other driver that has interested me is the Beyma 8XC20:
http://profesional.beyma.com/ingles/pdf/8XC20.pdf
Although from the graphs the polar response is all over the place!
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Old 3rd December 2012, 09:09 PM   #4
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Just looking around I found this:
http://www.eminence.com/pdf/Eminence_DIY_Home_Hi-Fi.pdf
may be some use.
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Old 4th December 2012, 06:09 PM   #5
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Quote:
Originally Posted by kipman725 View Post
Just looking around I found this:
http://www.eminence.com/pdf/Eminence_DIY_Home_Hi-Fi.pdf
may be some use.
Yes, I am using a derivative of their crossover design.
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Old 4th December 2012, 07:25 PM   #6
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Quote:
Originally Posted by craigtone View Post
Has anyone removed the screen from the D220Ti's? I am guessing it is there to prevent prodding fingers when mounted to a horn, but behind the dustcap, they should be safe. It is pretty thick wire, so I am concerned with dispersion.
I removed screens from D2500Tis, I assume the 220 is mounted similarly. Removing it will leave a lip which you'll want to smooth out, you can just use any filler you want that'll stick in place. You may wish to get some reticulated foam, sold for aquarium filters, and make a little insert for the throat, as this helps SQ.

I also coated my phragms with a thinned combo of tacky glue (foam glue, but aleene's tacky glue would work here too) and talc. Lots of thin coatings, and this made for a much nicer top end.

Coating Phragms 1.jpg

Coating Phragms 3.jpg
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Last edited by badman; 4th December 2012 at 07:28 PM.
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Old 12th December 2012, 10:15 PM   #7
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So funny story ... I kluged them together the other day to listen and the bass was unbearable! I was worried I'd have to do extensive mods to the cabinets to keep the resonance down.

Today I finished the crossovers (pic attached) and wired them back up. They sound GREAT! The bass was not at all overpowering and they were very neutral.

I can only assume that last time I had the woofer polarity reversed?

Anyway, long story short ... they sound GREAT! Next step is damping the cabinets and adding the terminals and L-pad.
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Old 13th December 2012, 01:55 AM   #8
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So that's just an inductor on the woofer? Is there a pad for the HF in there somewhere?
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Old 13th December 2012, 02:00 AM   #9
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So that's just an inductor on the woofer? Is there a pad for the HF in there somewhere?
No ... 2nd order for both HP and LP. The large inductor in series and the large cap in parallel with the woofer.

Yes, there is a remote L-pad for the HF.
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Old 13th December 2012, 02:33 AM   #10
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Oh yeah, I see it now. Really I was just prodding you to give more details about how you came up with the crossover .
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