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Eminence Beta-8CX 8" Coaxial Driver
The cross sectional views of this speaker found in the "Using coaxial speakers for DIY..." article imply that if no HF driver is mounted on the back an open port exists through the voice coil. Is a plug provided if this driver is to be used without HF?
There is no plug provided although the driver is shipped with a thick tape that covers the threaded hole. If you do not plan on using this as a coax, you might want to consider using the standard non CX Beta model instead.
Date published: 2014-07-11
What would be the ideal crossover point in a 2-way setup, 1.6K, 2K, 2.5K, 3K? Compression drivers to be purchased based on the crossover point.
A crossover of 2.5-3kHz will work well with this woofer.
Date published: 2014-06-13
What is the high frequency dispersion?
Is there a horn behind the dust cap, or is it just a hole? Any idea what the dispersion angle is? I noticed the B&C 8" has a 100 degree dispersion. If it does have a horn, what is the minimum frequency it loads to? I'm trying to decide if I need to mount the compression driver to a horn instead.
Yes, there is a loading horn behind the dust cap. It is a "conical" pattern. The thing to remember about all horns, is that the dispersion is frequency related and the horn length determines the "cutoff frequency". In this case, frequencies below around 1500-2000hz are no longer "horn loaded"---But they are still loud because of the resonance of the diaphragm in the magnetic field. When I use an eminence 1001 driver, I cross it over at 2,000-2500Hz. When I use a 2002 driver, I cross over at 1600 to 2000Hz. I do rentals and I rarely blow either driver with a 12db per oct crossover. Titanium domes in these drivers allow more flexibility. The "single point sound source" of a coaxial speaker out weighs the gain of a large horn. [mostly].
Date published: 2013-11-04
The Eminence APT-50 Super Tweeter has been suggested for this woofer. The Eminence APT-50 Super Tweeter doesn't seem to extend low enough for this woofer. Will Eminence APT-50 Super Tweeter work with this driver? What are suggested tweeters for this driver?
The response of the Beta-8CX falls off pretty slowly up top, so the APT50, crossed at 3.5KHz, maybe even 4KHz, should be fine. You may even get away with only a highpass on the tweeter.
Date published: 2013-07-28
How will this work in an aperiodic enclosure?
I read the statement related to ported enclosures, "It looks like each speaker requires a cabinet that is .43 cubic feet with a 2" diameter, 3" long port. This will tune the box to 67 Hz".I'm trying to stuff these in my car doors or kick panels. I have limited space and would like to achieve 80 Hz at high sound levels with this woofer in a very small enclosure. I would probably be better selecting another woofer, but I already have these. How will this woofer work in an aperiodic enclosure?I have a sound processor with up to 5th order crossver and an Equalizer #every 1/3 octave#.Thanks, Jay
These will likely play to 80 Hz in an application like this, but you will be excursion limited with anything more than 80 watts below 80 Hz. I would recommend bumping the high pass crossover up a bit, maybe 100-120 Hz.
Date published: 2013-03-20
Box size for this speaker
I want to build a set of four point source boxes over time for PA use with this speaker and an Eminence ASD1001s screwed into the back to be used as a vertical stack of one to four boxes depending on dictates of the room, etc. What is the size and configuration (vented or sealed) that brings out the best (widest freq. response) of this combo?
It looks like each speaker requires a cabinet that is .43 cubic feet with a 2" diameter, 3" long port. This will tune the box to 67 Hz.
Date published: 2012-11-21