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 *
  • Sealed Volume0.16 ft.³
  • Sealed F3154 Hz
  • Vented Volume0.36 ft.³
  • Vented F397 Hz
  • * Enclosure volume/F3s based on BassBox "optimum" calculations-
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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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: 2012-02-03
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: 2011-02-17
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: 2013-09-13
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: 2011-11-26

Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email tech@parts-expresss.com  for a prompt reply.
Eminence Beta-8CX 8" Coaxial Driver

Why is this product advertised as a coaxial speaker when it is really a mid-woofer with the capability of becoming a coaxial?

You still have to purchase a separate tweeter for it to become a coaxial speaker.
Asked by: Paradigm
it is advertised as such because it is a coaxial...with or with out the HF driver installed it is still constructed in such a way as to be able to mount a (super) tweeter in the center of the speaker.Other speakers that are not made this way, and do not have this capability are advertised as such.complete sets are available from atlas or b&c at a much greater cost, but they have no, or very limited flexibility. Also the complete sets make no provision for motor replacement, only diaphragms.The recommended HF driver for this unit is very good, but others with the same throat and thread may also be used. this allows a great deal more flexibility in tonal quality, dispersion and dynamics.Others in the category costing much more still do not come with a crossover and those that do, while of decent quality, leave question marks. If the need to replace a capacitor arose you would have to go soldering on the PCB, possible but what a pain! This is PA gear and would sound very much better with an active crossover anyways. If you wanted a passive XO there's quite a few good ones that are easier to replace, or replace parts on, than one little capacitor stuck to a tiny PCB attached to the basket. Again this also increases the overall flexibility of the unit.Pricing out the XO, HF and this unit, the cost for one complete system is still less than either the all-in-one atlas units or the b&c units, (which you still need an XO for.)
Answered by: doublejay
Date published: 2013-09-19

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
If you want some sparkle to this coax woofer, I suggest the eminence 1001 driver--you may need to add a resistor to pad it down 3db or so--depending on your taste {and hearing ability}. I cross over mine at 2500Hz. That seems to give a smooth transition for both. The APT-50 tweeter is fine, but you do need to protect it a bit more with a higher crossover point.
Answered by: Joe from San Francisco
Date published: 2013-09-19

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?
Asked by: denzee300
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.
Answered by: MattP
Date published: 2012-11-21

What Eminence HF Drivers fit? Does the new Neo HF Driver fit?

How does the HF driver mount?
Asked by: Mabco99
The high frequency driver mounts to the the rear of the magnet, standard 1-3/8" threads. More or less any 1-3/8" threaded driver would fit, including the Neo HF. I snapped a couple photos of the driver for you from the rear, including one with the APT-50 tweeter mounted to the Beta-8CX. Please pardon the cell phone quality of the photos.
Answered by: RussR
Date published: 2012-07-15

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
Asked by: jaypine
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.
Answered by: MattP
Date published: 2013-03-20

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

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