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Eminence Beta-8CX 8" Coaxial Driver

Brand:|Model: Beta-8CX|Part # 290-500
For maximum full-range speaker performance in the smallest possible footprint, consider the Eminence Beta-8CX 8" coaxial transducer.
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Part # 290-500
  • Standard screw on 1-3/8" 18 TPI mount for compression driver
  • High frequency horn is hidden behind the porous dust cap
  • Perfect for use in ultra compact monitors
  • Frequency response from 95 to 3,300 Hz allows easy transition to tweeter

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 Response95 to 3,300 Hz
  • Sensitivity92.9 dB 1W/1m
  • Voice Coil Diameter2"
  • Magnet Weight38 oz.
Thiele-Small Parameters
  • Resonant Frequency (Fs)62 Hz
  • DC Resistance (Re)5.37 ohms
  • Voice Coil Inductance (Le)0.67 mH
  • Mechanical Q (Qms)6.57
  • Electromagnetic Q (Qes)0.31
  • Total Q (Qts)0.29
  • Compliance Equivalent Volume (Vas)0.76 ft.³
  • Mechanical Compliance of Suspension (Cms)0.35 mm/N
  • BL Product (BL)11.21 Tm
  • Diaphragm Mass Inc. Airload (Mms)19g
  • Maximum Linear Excursion (Xmax)3.20 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 CategoryPro Coaxial 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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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

Get your questions answered from other customers
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Eminence Beta-8CX 8" Coaxial Driver

What would be the optimum box tuning frequency for this driver when used in the Dayton MTM 1.0 cu/ft box?

Asked by: Paulk
Whether you are using one or two drivers, all you will need is a 3" hole for a tuning frequency of 67 Hz.
Answered by: MattP
Date published: 2015-09-10

What would be the optimum box tuning frequency for this driver in the Dayton audio MTM 1.0 premade enclosure?

Asked by: PaulK
That volume is quite a bit larger than optimal. in order to tune high enough I would recommend two 3" diameter ports that are 2" long, which tunes to about 70 Hz. If you can add mass to the inside of the enclosure to take up about half of the volume, one port at the same diameter and length will work a little better.
Answered by: MattP
Date published: 2015-09-18

This is NOT a COAXIAL speaker. (look at teh photos and specs)

Asked by: Rick8886
This is a coaxial driver. Since it does not include a compression driver, the specs are only for the woofer itself.
Answered by: MattP
Date published: 2015-11-04

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.
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
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