Eminence Beta-8CX 8" Coaxial Driver

Brand:| Model: Beta-8CX
For maximum full-range speaker performance in the smallest possible footprint, consider the Eminence Beta-8CX 8" coaxial transducer.
  • Kapton coil former
  • Polyamide-imide coated copper voice coil
  • Ferrite magnet
  • Extended pole piece
  • Pressed steel basket
  • Paper cone
  • Cloth accordian surround
Part # 
Weight: 6.1 lbs.  
Your Price
Part # 290-500
Qty:  EA
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Product Details

Eminence Beta-8CX 8" Coaxial Driver

The Eminence Beta-8CX 8" Coaxial Driver is recommended for professional audio midrange reproduction in sealed loudspeaker enclosures. Also suitable for midbass or floor monitor applications in vented 2-way speaker cabinets. The Beta-8CX's coaxial design facilitates use of an HF driver to extend frequency response. Standard 1-3/8"-18 TPI threaded insert for HF horn driver (sold separately). Made in the USA. 7-year manufacturer's warranty!

Featured in Eminence's "Using coaxial products for DIY monitors and home hi-fi applications" article.

Product Specifications
  • Nominal Diameter8"
  • Power Handling (RMS)250 Watts
  • Power Handling (max)500 Watts
  • Impedance8 ohms
  • Frequency Response74 to 3,000 Hz
  • Sensitivity93.3 dB 1W/1m
  • Voice Coil Diameter2"
  • Magnet Weight38 oz.
Thiele-Small Parameters
  • Resonant Frequency (Fs)63 Hz
  • DC Resistance (Re)5.6 ohms
  • Voice Coil Inductance (Le)0.85 mH
  • Mechanical Q (Qms)8.82
  • Electromagnetic Q (Qes)0.34
  • Total Q (Qts)0.33
  • Compliance Equivalent Volume (Vas)0.71 ft.³
  • Mechanical Compliance of Suspension (Cms)0.32 mm/N
  • BL Product (BL)11.1 Tm
  • Diaphragm Mass Inc. Airload (Mms)18.3g
  • Maximum Linear Excursion (Xmax)3.2 mm
  • Surface Area of Cone (Sd)210 cm²
Materials of Construction
  • Cone MaterialTreated Paper
  • Surround MaterialCloth
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerKapton® / Polyimide
  • Basket / Frame MaterialSteel
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter8.24"
  • Baffle Cutout Diameter7.13"
  • Depth3.5"
  • # Mounting Holes8
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.16 ft.³
  • Sealed F3154 Hz
  • Vented Volume0.36 ft.³
  • Vented F397 Hz
Eminence Beta-8CX 8" Coaxial Driver
  • BrandEminence Speaker
  • ModelBeta-8CX
  • Part Number290-500
  • UPC876358000074
  • Product CategoryCoaxial Full-Range Speakers
  • Unit of MeasureEA
  • Product Rating
    (4 Reviews)
  • Weight6.1 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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View similar products to the Eminence Beta-8CX 8" Coaxial Driver
in the Coaxial Full-Range Speakers product category.


Eminence Beta-8CX 8" Coaxial Driver
Eminence Beta-8CX 8" Coaxial Driver is rated 4.75 out of 5 by 4.
Rated 5 out of 5 by from Amazing!I made a custom set of wakeboard tower speakers in polished aluminum sealed cans. With a ASD1001 behind it and crossed over through a 2.5k eminence crossover, these things just blow my mind! They sound absolutly amazing! They project insanley far, I can hear them clear as day at 25mph and 75ft back! I was worried about low volume clarity, but when I hooked them up my worries washed away!
Date published: 2011-07-27
Rated 4 out of 5 by from Versatile product..I like this speaker for mids in my Bi-amped 3-way bass guitar rig. A solid product, but 2 emails to eminence weren't able to address my concerns about using then in sealed boxes.
Date published: 2009-12-05
Rated 5 out of 5 by from One of Eminence's BEST productsThis device is extraordinary. It outperforms other speakers in this range. Combined with an APT-50 tweeter (which is excellent) and a good crossover, you can create a stunning little PA system in a tiny box that beats many of the top name-brand speakers by a mile for a LOT less $$$. Tip: Put two in each box in a vertical array. You can mount the tweeter on one speaker for a super compact design, or place the tweeter (with a wide dispersion horn; APT-150 for example) in between the two speakers for a quasi D'Appolito array.Either way, you will get beautiful imaging, superb off-axis response and amazing clarity throughout the musical frequency spectrum.No matter what tweeter you choose, you ll find this driver excells for the range from about 100Hz to 2.5 kHz.There are several finished crossovers here on the PE website that would work for this: (Dayton XO2W-2.5K 2-Way for instance)If you are on a tight budget and don't want the hassle of a crossover, use a piezo with an L-pad.
Date published: 2008-07-10
Rated 5 out of 5 by from Excellent Product - Just what I needed.I used these in a Peavey 1516 bass cabinet to replace the old 8" drivers. With the addition of piezo tweeters, I can use this cabinet both for bass and keyboards. Thank you Eminence!
Date published: 2008-06-17
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Product Q&A

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who own this product or have experience with it.
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Eminence Beta-8CX 8" Coaxial Driver

Is there a 16 Ohm version of this speaker available ?

Asked by: Doc Ivo
Unfortunately no. The only 16 ohm 8" coax we have available is from B&C below.http://www.parts-express.com/bc-8cxn51-16-8-professional-neodymium-coaxial-speaker-100-x-100-16-ohm--294-5765
Answered by: MattP
Date published: 2015-01-19

Can these be used as in-wall speakers for LCR withe the denovo dna-150?  If so how deep would the cavity need to be?

Asked by: corradizo1
Yes these will work with that compression driver for an in wall application, but they will not play much lower than about 80-100 Hz if used without an enclosure. The total depth of the speaker will be 5" to 5-1/2" with the compression driver.
Answered by: MattP
Date published: 2014-08-21

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?

Asked by: JackNoir
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.
Answered by: MattP
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.

Asked by: Joosoof
A crossover of 2.5-3kHz will work well with this woofer.
Answered by: MattP
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.
Asked by: RoboCam
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].
Answered by: Joe from San Francisco
Date published: 2013-11-04

Which tweeter?

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?
Asked by: jaypine
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.
Answered by: Circuitsoft
Date published: 2013-07-28
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