Eminence Beta-12A-II 12" Driver

Brand:| Model: Beta-12A-II
The performance of the Eminence Beta-12A-II 12" speaker is optimized for sound reinforcement systems. The Beta-12A-II is also suitable for lead and bass guitar, keyboards, guitar combos club music systems and stage monitors.
  • Kapton coil former
  • Polyamide-imide coated copper voice coil
  • Ferrite magnet
  • Vented and pole piece
  • Pressed steel basket
  • Paper cone
  • Cloth accordian surround
Part # 
Weight: 11 lbs.  
Your Price
Part # 290-408
Qty:  EA
Available Payment Methods

Product Details

Eminence Beta-12A-II 12" Driver

The performance of the Eminence Beta-12A-II 12" speaker is optimized for sound reinforcement systems. The Beta-12A-II is also suitable for lead and bass guitar, keyboards, guitar combos club music systems and stage monitors. Made in the USA. 7-year manufacturer's warranty!

Product Specifications
  • Nominal Diameter12"
  • Power Handling (RMS)250 Watts
  • Power Handling (max)500 Watts
  • Impedance8 ohms
  • Frequency Response43 to 3,800 Hz
  • Sensitivity98 dB 1W/1m
  • Voice Coil Diameter2"
  • Magnet Weight38 oz.
Thiele-Small Parameters
  • Resonant Frequency (Fs)47 Hz
  • DC Resistance (Re)5 ohms
  • Voice Coil Inductance (Le)0.64 mH
  • Mechanical Q (Qms)6
  • Electromagnetic Q (Qes)0.5
  • Total Q (Qts)0.46
  • Compliance Equivalent Volume (Vas)4.2 ft.³
  • Mechanical Compliance of Suspension (Cms)0.29 mm/N
  • BL Product (BL)10.8 Tm
  • Diaphragm Mass Inc. Airload (Mms)40g
  • Maximum Linear Excursion (Xmax)4.4 mm
  • Surface Area of Cone (Sd)538.9 cm²
Materials of Construction
  • Cone MaterialPaper
  • Surround MaterialCloth
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerKapton® / Polyimide
  • Basket / Frame MaterialSteel
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter12.03"
  • Baffle Cutout Diameter10.95"
  • Depth4.57"
  • # Mounting Holes8
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume2.36 ft.³
  • Sealed F383 Hz
  • Vented Volume7.35 ft.³
  • Vented F342 Hz
Eminence Beta-12A-II 12" Driver
  • BrandEminence Speaker
  • ModelBeta-12A-II
  • Part Number290-408
  • UPC876358000111
  • Product CategoryWoofers, Subwoofers & Midrange Speakers
  • Unit of MeasureEA
  • Product Rating
    (11 Reviews)
  • Weight11 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-12A-II 12" Driver
Eminence Beta-12A-II 12" Driver is rated 4.5455 out of 5 by 11.
Rated 5 out of 5 by from Superlative replacement woofer for Behringer B212XThis was an audibly awesome upgrade for the blown woofers in my Behringer B212XL mains.
Date published: 2014-07-25
Rated 4 out of 5 by from Eminence 12" DriverIf you are looking to replace speakers, start here! This speaker is everything you need at an outstanding price! Clear, crisp, loud...what else is there. Replaced a couple of monitor speakers with the Eminence and this pups are BETTER than before! I'll be back for more...GUARANTEED!
Date published: 2013-08-08
Rated 5 out of 5 by from Outstanding for 212 bass cabinet!!I've done quite a bit of research before building my 212 cab. I used the design program BassBox lite to help me choose which drivers to use. I went through a laundry list of Eminence drivers before making my selection. I have to say, I am really impressed by the performance that these drivers possess! I ran them in parallel to achieve a 500W 4ohm load. I used the Eminence APT-80 HF driver along withe the Eminence px23k5 crossover. I had to run an 8ohm resistor in parallel to match the 4ohm load of the 212s. I highly recommend using these drivers for bass cabinet applications!!
Date published: 2012-10-25
Rated 5 out of 5 by from Upgraded to Double the PowerThis woofer was a perfect upgrade, along with Dayton PC2W3.5K crossover, to increase the power handling and sound quality of Audio Centron monitor with blown woofer from 125w to 250w.
Date published: 2009-11-13
Rated 5 out of 5 by from just what i neededi used this in my homemade leslie cabinet. it is the ideal driver for my purposes. great value
Date published: 2008-11-16
Rated 4 out of 5 by from ImpressedGot this for a replacement in a monitor.I've been running a bass amp extension through the monitor with great results. Good response adn sound without hardly any over excursion.Very please with the Eminence line.
Date published: 2008-09-25
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Product Q&A

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who own this product or have experience with it.
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please email tech@parts-expresss.com  for a prompt reply.
Eminence Beta-12A-II 12" Driver

What would be a good ported enclosure size?

What would be a good ported enclosure size for this driver?
Asked by: gcou
This woofer requires a fairly large vented box, around 5 cubic feet. If you raise the tuning frequency up it will work in a smaller enclosure, roughly 1.7 cubic feet. This will give you a bit of a natural bass boost around 60 Hz when used with a 3" diameter, 1.5" long port.
Answered by: MattP
Date published: 2013-02-05
  • 2015-03-30T09:35CST
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