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Old 5th April 2013, 04:16 AM   #51
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The original kit was based off of the APT50. That is the one that was reviewed in the article I linked. It really is a nice crossover and would need DSP / PEQ to duplicate in an active setup.

Later they redid the design with another compression driver and renamed it the HE10.1 MkII. It was a little off-the-shelf unit that Adire called the the ACD1. It was sourced through a company called Sound Lab of Chicago, I think. It looked quite similar to a Pyle model, at the time. It was a similar sort of design but used a titanium diaphragm instead of phenolic.
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Old 5th April 2013, 05:03 AM   #52
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Has anybody tried Beta10CX with active crossover. I have a ESP pcb for LR 24dB active crossover and I intend to put parts for 2,5kHz xover frequency (so that xover is universal for almost any two way combination). Any other suggestions for active xover frequency for Beta 10CX and APT50?
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Old 5th April 2013, 05:42 AM   #53
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Very important:

Latest APT50 pdf on Eminence site states that "A negative voltage at the red terminal causes a positive pressure at the output of the device". But earlier pdf stated that positive voltage on red terminal causes a positive pressure. I was confused so I contacted Eminence about this issue and they told me that earlier pdf was wrong and that new pdf is right for all APT50.

After reading D'Apolito review for Adire kits I am in doubt if bad sound some people experince with APT50 is due to wrong polarity markings on the driver itself?
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Old 5th April 2013, 06:20 AM   #54
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Well the APT is now an updated design which I believe has an improved exit angle for mating to the CX10 which might account for the more recent, more positive user reviews. I do think there's better options for use with the CX10 and I suspect compression units with phase plugs will perform better combined with a lower crossover point. Faital Pro has two such 1" drivers with non metal diaphragms whose responses appear to be incredibly smooth!
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Old 2nd August 2013, 04:46 AM   #55
freddi is offline freddi  United States
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using Eminence's values, one can put two 6.8uF caps in series on the highpass and experiment with charge coupling at their center junction.
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Old 2nd August 2013, 05:06 AM   #56
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Is the 8CX effectively the same horn? I'm about to try a CDX1-1746 on it. (It's sitting on my table waiting to be measured). I doubt lower crossover points are the answer, though. That little horn surely loses control.
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Old 2nd August 2013, 09:13 PM   #57
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I have both the beta10cx and the 8cx. As far as I can tell, the horn is the same. It is 1.875" dia, which would be good to about 2300 hz if you go by the wavelength divided by pi.

Driven with a selenium 220ti and no crossover shows it dropping off rapidly below 2Khz, so 2.5K seems like a good xover point.
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Old 5th August 2013, 02:32 PM   #58
xrk971 is online now xrk971  United States
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Default Probably also an Accidental MLTL?

The Beta 10CX is a driver that I am looking forward to getting and using in a variety of enclosures. Namely, the Karlson K15 and Karlsonator are both great boxes for this driver according to my sims here: Karlsonator

Click the image to open in full size.

Quote:
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.
But I noticed that the dimensions being used by the OP make this tower speaker, a potential accidental mass loaded transmission line (MLTL). I actually use the accidental MLTL (AMLTL) to design some nice speakers with great bass extension (beyond what the BR programs predict as the tuning freq). Lengths from 30 in to 60 with the vent located towards the bottom all exhibit this feature. The AMLTL is described here: Accidental MLTL Technique

So I think these speakers may actually have deeper bass than you think and should sound nicer than just a bass reflex.

It may sound even better if you stretch it to 48 in tall and make depth 10.5 in to preserve volume but give the TL effect more distance to develop. One thing that can help is to use stuffing in top 2/3rds rather than just lining walls with batting per BR design methods. This will help reduce a lot of high freq peaks and dips from getting out the port.
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Old 6th August 2013, 02:30 AM   #59
xrk971 is online now xrk971  United States
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Default Beta 10CX in a 45 in tall MLTL tower

Here is a sim of a Beta 10Cx in an optimized MLTL. The design is: 45 in tall, 12 in wide, 11 in deep, 4 in dia x 5.25 in long vent at 6 in from bottom, driver 11 in from top, stuffing in upper 2/3rds of TL.

First plot is frequency response at 1 m, with speaker placed against a wall. Second plot is impedance, and third is cone displacement.

This design seems like it has some nice deep bass. The HF will be handled by the CD and horn (not simulated).
Attached Images
File Type: png MLTL-Beta10CX-Freq-1m.png (30.6 KB, 1018 views)
File Type: png MLTL-Beta10CX-Impedance.png (23.1 KB, 469 views)
File Type: png MLTL-Beta10CX-Displ.png (23.1 KB, 466 views)
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Old 8th August 2013, 04:11 AM   #60
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by craigtone View Post
Yes, I am using a derivative of their crossover design.
Can you please post a diagram of the crossover you are using including component values? I want to add the crossover and CD horn to my model of the MLTL with the Beta 10cx.

Thanks
X
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