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.  
List Price$84.99
Regular Price$79.99
You Save10%
Special Price
Sale Ends7/31/2014
Part # 290-408
Qty:  EA
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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
    (10 Reviews)
  • Weight11 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product contains 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 4.5 out of 5 by 10.
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
Rated 5 out of 5 by from Very HappyQuality and construction appear very good and I really appreciate the gasket on the back side of the basket for mounting on the front of the baffle. The packing from Eminence was excellent. I installed these speakers in mid sized sealed cabinets along with the 270-125 heavy duty titanium super tweeters. Over all I m very pleased. I am powering them with a 150W per channel mixer. These will play extremely loud with no hint of distortion. No rubs, buzzes, or other issues. The sound is fairly natural. Very punchy in the mid range. Vocals and guitar seem to come to the front of the mix. The bass is more subdued. Of course, this is probably due to overlap with the tweeters. At low and medium volume they still sound good. Almost as good as decent Hi-Fi speakers and better than most PA speakers on recorded music. I think they ll work really well for my indented purpose as PA vocal speakers.
Date published: 2008-07-01

Product Q&A

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who own this product or have experience with it.
If your question requires design or troubleshooting information,
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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: Danseur
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

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