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Eminence Beta-10CX 10" Coaxial Driver
Is this a true coaxial speaker?
What I mean is there 2 separate drivers or just a whizzer tweeter like on older car speakers?
This is a coaxial speaker, in that it has a 1-3/8" threaded entrance in the magnet to facilitate the installation of a compression driver or similar high frequency device. I've included a couple photos of this speaker's little brother, the Beta-8CX, with and without the HF driver for reference.
Date published: 2011-11-12
What would be the minimal and also optimal sealed enclosure size? What if ported and what tube?
I am looking to build a custom monitor for 100 Hz and up. I need a very natural and smooth response. The APT-50 Super Tweeter would be added. It would be bi-amped with an electronic crossover plus amp. This would be for a permanently installed stage monitoring situation; acoustic instruments and vocals mostly. Hence, I don't need much bottom end.
A sealed enclosure of .98 cubic feet would give you a Q of .7 and a F3 of 89hz with a linear taper from -6dB@ 67hz down.Reducing sealed enclosure to a minimum of 0.6 cubic feet keeps you approximately linear above 110hz and gives you an F3 in the mid 90s. Smaller than that enclosure size would not be advised, Q is already in the high 80's here.If you choose to go with a vented enclosure, 2.0 cubic feet with a 50hz port tuning frequency keeps you very linear down to 60hz and keeps phase coherent (identical to "sealed" phase) down to well below 80hz. F3 is right at 50hz and at 40hz (low E on a four string bass) you're at -9dB. Not bad. If you do two, 3" diameter vents 4.95" deep with at least a 1/16" radius roundover at each end, you'll be in good shape.
Date published: 2012-07-18
Removed from the APT 50 tweeter, what is the highest usable frequency of the 10CX?
Figure 3100hz on the upper end max. If you are crossing it over, do so around 2K at 6db/oct. You can go up higher but will want a steeper slope to avoid beaming and anomolies in the response curve.
Date published: 2013-09-30
Will the ASD1001 work?
I see that it is common to use the APT-50 HF driver with the 10cx, though I can't seem to find the source of this recommendation. Is there any issue with using the (better?) ASD1001 instead? If not, what would the recommended crossover be for that setup? Thanks!
That is a very good match. The ASD1001 is very efficient and LOUD. Great high end as well. Some drivers are rated above 10K but that is with a fast roll off. This one is a true tweeter driver. Crossover is about 3K to 3.5K. This point, matches the woofer well. A great value as well.
Date published: 2013-09-11