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

Brand:| Model: Sigma Pro-18A-2
Eminence's Sigma Pro-18A-2 18" cast frame speaker performs superbly in moderately-sized professional PA subwoofer loudspeaker systems.
  • 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
Part # 
Weight: 27.9 lbs.  
Your Price
Part # 290-427
Qty:  EA
Available Payment Methods

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)1.9 mH
  • Mechanical Q (Qms)8.28
  • Electromagnetic Q (Qes)0.3
  • Total Q (Qts)0.29
  • Compliance Equivalent Volume (Vas)16.6 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)1140 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
  • * Enclosure volume/F3s based on BassBox "optimum" calculations-
Optimum Cabinet Size *
  • Sealed Volume1.87 ft.³
  • Sealed F383 Hz
  • Vented Volume4.33 ft.³
  • Vented F353 Hz
  • * Enclosure volume/F3s based on BassBox "optimum" calculations-
Eminence Sigma Pro-18A-2 18" Cast Frame Driver
  • BrandEminence Speaker
  • ModelSigma Pro-18A-2
  • Part Number290-427
  • UPC876358000395
  • Product CategoryWoofers, 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.

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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: 2013-04-17
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: 2011-04-24
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: 2013-05-11
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: 2011-02-17
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: 2012-09-26
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: 2013-10-13

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

hi i customize car audio and i was wondering if this speaker was more like a woofer type speaker or a loud Speaker

Asked by: creflo
This speaker is designed for use as a Pro Audio subwoofer, however there is a movement in Car Audio to use high sensitivity drivers such as this.I would recommend a 4.5 cubic foot cabinet with two 4" diameter ports that are 6-3/4" long. This will tune the cabinet to 40 Hz and net you an f3 of 53 Hz. Your f6 should be at about 43 Hz making this a very good subwoofer for music.
Answered by: mikevv
Date published: 2013-01-26

Product comparison

I'm building a speaker on a budget - how would you compare this speaker to the Eminence Definimax 4018LF 18" Driver? This speaker is almost 1/2 the price and the reviewers all seem to like them. I will be using 2 18" drivers in the cabinet primarily for bass in a mobile dj/pa rig. (3 way speakers)
Asked by: joshag
There are a few differences, these Sigma Pro's need larger boxes compaired to the Definimax woofers to reach as low (about 40% larger). Also the Definimax has a better motor (Larger VC, Shorting ring, higher xmax), but these should still serve your purpose well.
Answered by: mtg90
Date published: 2013-04-17

How big should I build the enclosure?

In the cabinet design pdf is the given enclosure size for both drivers in the "Dual SigmaPro18A Large PA Subwoofer Cabinet" section or is it per driver (11.12cu.ft. for both or per driver)? Also is it 2 ports per side or 1 per driver. Thanks!
Asked by: Audio Al
The design is for two drivers. Cabinet size 11.12. and two ports as specified.Build the cabinet symetrically - woofer top and bottom, with ports centered left and right.
Answered by: MarkAJH
Date published: 2012-06-27

would these be an acceptable driver in a DIY t18 box? any power limitations? also considering Peavey Low rider 18

Asked by: RodneyM
The Eminence would be better suited for that application, unfortunately we have no way of modeling that type of enclosure. I would recommend a high pass filter set at about 40 Hz.
Answered by: MattP
Date published: 2013-06-11

Would this perform well in a 1x18 W-Bin design? Some other driver maybe?

Asked by: spezzo
This will work OK but you would be farther ahead with the Omega Pro 18 from Eminence for this application. It has a bit more power handling and a stronger cone for horns or scoops.
Answered by: MattP
Date published: 2013-09-09

I have a couple sigma pro 18a 2 speakers but need to know the specs to build my speaker box

Asked by: gaza
I would recommend a box with external dimensions of 22"H x 28"W x 18"D using 3/4" material. A single 6" diameter port that is 9" long will tune the box to 34 Hz.
Answered by: MattP
Date published: 2014-03-24

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