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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
Eminence Baseball Cap
Qty: 1Part # 520-300
List Price:$19.99
Part # 290-427
Qty:  EA
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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
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: 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

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who own this product or have experience with it.
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Eminence Sigma Pro-18A-2 18" Cast Frame Driver

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

i have this sub in a beringer eurolive vp1800s box which dimensions are (WxHxD)20.9''x25.6''x24.2''. and using a gem sound xps-1000 amp but my concern about this is even though the amp is not near clip the sub start popping bad .can you help?

Asked by: lv68
Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-03-11

I am using these as subwoofers and was wandering where to cross them over.  The highs are placed on a pole above them.  

Asked by: strander
This depends on how low the main speakers can play safely at the volume level you need. Generally subwoofers are crossed between 80-120 Hz, so you will have to dial them into the best sound to your ear.
Answered by: MattP
Date published: 2015-02-03

i have the 4.0cuft knockdown subwoofer box with the 18" HO driver can I replace it with the sigma driver?

Asked by: fjc20
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: 2014-08-25

I have 2 of the EV ELX118 subs and  I am thinking of replacing them with high output drivers (above 500 RMS!). I am wondering if the the Sigma Pro-18A-2 18", would be ideal replacement? other alternatives? Please help. Thanks

Asked by: Permoson
The Sigma is an incredible driver for the price and will work very well in that EV cab, although I cannot say what specific differences you will here.
Answered by: MattP
Date published: 2015-02-03

Would these be a good upgrade to Peavey PV118 cabs? If so, would a QSC PLX2402 bridged providing 2400W into 4 ohms (two of these in parallel) be a good idea? 

Asked by: strander
These will work very well as replacements for those cabinets. 2400 watts will certainly be overkill for a pair but there is nothing wrong with having the headroom. Keep an eye on woofer excursion and I would recommend a HPF set at 35-40 Hz.
Answered by: MattP
Date published: 2014-07-02
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