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Eminence Sigma Pro-18A-2 18" Cast Frame Driver

Brand:|Model: Sigma Pro-18A-2|Part # 290-427
Eminence's Sigma Pro-18A-2 18" cast frame speaker performs superbly in moderately-sized professional PA subwoofer loudspeaker systems.
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Eminence Baseball Cap
Qty: 1Part # 520-300
List Price:$19.99
Part # 290-427
  • Copper voice coil on polyimide former
  • Die-cast aluminum basket
  • Vented and extended pole piece
  • Paper cone with cloth cone edge
  • Great replacement for the Dayton Audio PF460-8 18" Cast Frame Driver 4" VC

Product Details

Eminence Sigma Pro-18A-2 18" Cast Frame Driver

The Eminence Sigma Pro-18A-2 18" cast frame speaker is recommended for professional audio as a woofer or subwoofer in vented enclosures. It has been engineered for durability as well as exceptional sound quality, and will serve well when loaded into high-output live sound or music playback systems. Made in the USA. 7-year manufacturer's warranty!

Product Specifications
  • Nominal Diameter18"
  • Power Handling (RMS)650 Watts
  • Power Handling (max)1300 Watts
  • Impedance8 ohms
  • Frequency Response41 to 2,400 Hz
  • Sensitivity99 dB 1W/1m
  • Voice Coil Diameter3"
  • Magnet Weight120 oz.
Thiele-Small Parameters
  • Resonant Frequency (Fs)28 Hz
  • DC Resistance (Re)6.29 ohms
  • Voice Coil Inductance (Le)1.90 mH
  • Mechanical Q (Qms)8.28
  • Electromagnetic Q (Qes)0.30
  • Total Q (Qts)0.29
  • Compliance Equivalent Volume (Vas)15.58 ft.³
  • Mechanical Compliance of Suspension (Cms)0.24 mm/N
  • BL Product (BL)22.1 Tm
  • Diaphragm Mass Inc. Airload (Mms)130g
  • Maximum Linear Excursion (Xmax)6.1 mm
  • Surface Area of Cone (Sd)1,140 cm²
Materials of Construction
  • Cone MaterialPaper
  • Surround MaterialCloth
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerKapton® / Polyimide
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter18"
  • Baffle Cutout Diameter16.56"
  • Depth8.15"
  • # Mounting Holes8
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume1.87 ft.³
  • Sealed F383 Hz
  • Vented Volume4.33 ft.³
  • Vented F353 Hz
Eminence Sigma Pro-18A-2 18" Cast Frame Driver
  • BrandEminence Speaker
  • ModelSigma Pro-18A-2
  • Part Number290-427
  • UPC876358000395
  • Product CategoryPro Woofers, Subwoofers & Midrange Speakers
  • Unit of MeasureEA
  • Product Rating
    (19 Reviews)
  • Weight27.9 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 Sigma Pro-18A-2 18" Cast Frame Driver
in the Pro Woofers, Subwoofers & Midrange Speakers product category.


Eminence Sigma Pro-18A-2 18" Cast Frame Driver
Eminence Sigma Pro-18A-2 18" Cast Frame Driver is rated 4.7895 out of 5 by 19.
Rated 5 out of 5 by from Great Replacement Driver!Used to replace a blown Behringer speaker in a ported cabinet...used the Parts Express Chart using cabinet volume and size: WOW! Sounds absolutely fantastic and was cheaper than a speaker that I had picked out earlier...great value, great advice!! Thank you Parts Express! We now have a "Rock Solid" bottom end in the auditorium, with increased efficiency to boot!
Date published: 2012-04-16
Rated 5 out of 5 by from Great Sub DriverI bought just one of these drivers to try out before investing in more. And all I have to say is WOW! These drivers are amazing! They take all the power you throw at them and are built very strong. I have had no problems with these drivers at all, and will be purchasing more Eminence products in the future.
Date published: 2011-04-19
Rated 5 out of 5 by from Great Subwoofers at a Great Price!I have a pair of Horizon, (which sold to CGM, and are now known as EAI), subwoofers that had low power OEM eminence drivers in them that did very well but were older. After years of abuse one of them finally burned out with my bridged PLX3002 on them, so I decided to replace them both so the cabinets matched and I could couple them together properly.I knew from talking to EAI and testing different drivers in the Eminence design software that the Sigma Pro 18A-2 was better for the money than the Omega Pro 18 so I went with the Sigmas. I crossed them over at 32Hz on the low end with a fairly steep curve and then at 90Hz to keep them clean with my JBL MRX515 Tops through my Driverack 260 and sent 3,000 watts to the pair with my QSC PLX3002 in bridged mono mode running at 4ohms.I am glad I went with the Sigma drivers, I abused them with a High School Prom that wanted it louder, louder, louder... you know how they are. :P They took it with no problems at all and kept shaking everything in the room all night with no signs of distortion or anything at anytime even with some of the crazy Dubstep stuff.I couldn't be happier with my choice and I think that these are great for the money for a variety of box styles.
Date published: 2011-04-17
Rated 4 out of 5 by from Excellent for bass guitar cabinetThis has been my go-to for replacing stock drivers in bass guitar cabinets for years. They exceed the performance of even the "high-end" drivers in boutique brand cabinets.
Date published: 2010-07-22
Rated 5 out of 5 by from Great Price for Great Sound!!!I bought a set of used Carvin sub cabinets from a friend a few years ago... replaced even one sub with Eminence.. a world of difference. Definatly happy overall with the Sigma series.
Date published: 2010-04-21
Rated 5 out of 5 by from Best 18" LF valueEminence is always a value and a reliable productThe Omega 18 is aslo a great piece cost wise but Sigma although less power hungry is more efficient- nearly same output at half the power We repair many Pro LF drivers and Eminence now has a better reliability record than many higher priced brands
Date published: 2010-02-19
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Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
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Eminence Sigma Pro-18A-2 18" Cast Frame Driver

hey, I want to use this driver as front speakers in home audio application. What size box would you recommend. and am thinking the sigma pro or omega pro. thanks.

Asked by: swill
This requires a bit more information in order to proceed. Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2016-01-13

Could this effectively serve as a wall-mounted, infinite baffle sub?

Asked by: davisoly
This would not be a good choice for an IB application. I would recommend the Dayton IB385-8 instead which is made for the application and actually displaces more air than the Sigma woofer.
Answered by: MattP
Date published: 2015-12-28

Will this driver work in Jbl Mp418s sub.

Asked by: Bambu
We do not have a cross reference available for this type of thing. Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-09-23

I'd like to put 2 of these in a box with max dimensions 20" high by 65" wide with a single slot vent in the middle. Suggestions?

Asked by: utbroker
Make the box 18" deep with a slot port that is 18.5"H x 4"W and 11"D.
Answered by: MattP
Date published: 2015-09-01

Would these be a good choice as replacement woofers for Cerwin Vega PD-18 speakers? The original driver is the CV 188EB. I would like to find the best possible option to revitalized my PD-18s. Thanks! Ross

Asked by: Varmon
This woofer will be a very good replacement for those speakers.
Answered by: MattP
Date published: 2015-05-06

I would like to build PA ported subwoofer cabinets using plywood and to compliment JBL515EON's I was thinking crossover at 80hz down to maybe 12 to16 hz for port.  I would like to do a slot port on the bottom.  What size cabinet and port do I need?  

Asked by: jreb14
It is not practical to tune this type of subwoofer so low. They are designed to be tuned in the mid 30's-40's since this is about as low as most music plays. I would recommend external dimensions of 28"H x 22"W x 18"D with a port that is 2"H x 20.5"W x 15"L for a tuning frequency of 37 Hz.
Answered by: MattP
Date published: 2015-03-12
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