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Eminence Beta-12A-II 12" Driver

Brand:|Model: Beta-12A-II|Part # 290-408
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.
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List Price$79.99
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Part # 290-408
  • Kapton coil former
  • Polyamide-imide coated copper voice coil
  • Ferrite magnet
  • Vented and pole piece
  • Pressed steel basket
  • Paper cone
  • Cloth accordian surround

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)0.50
  • Total Q (Qts)0.46
  • Compliance Equivalent Volume (Vas)4.24 ft.³
  • Mechanical Compliance of Suspension (Cms)0.29 mm/N
  • BL Product (BL)10.80 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 CategoryPro Woofers, 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.

View similar products to the Eminence Beta-12A-II 12" Driver
in the Pro Woofers, Subwoofers & Midrange Speakers product category.


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

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  for a prompt reply.
Eminence Beta-12A-II 12" Driver

Would this woofer work well in a 2.3 cubic feet sealed, three way home audio enclosure?

Asked by: gretsch8217
This would be a good choice for a sealed volume of 2.3 cubic feet, but it will be very limited on the low end. It is also very efficient by home audio standards, so it really depends on what you need to match the rest of the system. Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-09-18

Would I be able to drive this at a reasonable volume with this?

Asked by: Whoopdido
Yes, that amplifier has more than enough power to get plenty of volume from that driver.
Answered by: MattP
Date published: 2015-08-19

im considering this (two in stereo) as a sub/bass system for a small house party/studio monitoring main rig together with beta-10cx/apt50-combo as mid/top. im just wondering how it would play in a sealed box of 30l, as I already have the boxes?

Asked by: optimistic
This woofer will have limited low end in a sealed enclosure of that volume. If will have useable output to about 60 Hz.
Answered by: MattP
Date published: 2015-04-29

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
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