Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohms Per Coil

Brand:| Model: UM12-22
Product Video
Dayton Audio's Ultimax Series DVC subwoofers are purpose-built to move air and create clean, articulate, fast bass. Experience the apex of subwoofer design.
  • Thick, one-piece Nomex honeycomb covered cone with woven heavy-duty glass-fiber
  • Tall-boy rubber surround for extra-long linear excursion without reducing cone surface area
  • 600 watts RMS power handling
  • Copper shorting rings and cap reduce distortion due to inductance variations
  • Dual 2 ohm, 2-layer copper voice coils
  • Large vented pole piece and under-spider venting
  • Black anodized aluminum former and black pole improves heat dissipation
Part # 
Weight: 24.95 lbs.  
List Price$233.99
You Save23%
Your Price
Buy 4-up$170.91
Part # 295-512
Qty:  EA
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Product Details

Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohms Per Coil

The Ultimax Series of dual voice coil subwoofers, from Dayton Audio, are not for the faint of heart. Built using the latest in subwoofer technology, Ultimax subwoofers are the pinnacle of low frequency driver design. An Ultimax subwoofer tests the strength of your foundation with fast, articulate, gut-wrenching bass. 

Dual 2 ohm voice coils allow for stereo 2 ohm and mono 1 ohm wiring configurations when connecting to high current car audio and professional audio amplifiers to extract maximum power. For home audio applications, simply wire the voice coils in series for a benign 4 ohm load for greater amplifier compatibility.

To improve power handling, increase thermal management, and reduce power compression, Dayton Audio designed the Ultimax Series with large black anodized formers and vented pole pieces, under-spider ventilation, and two-layer copper voice coils.

Over 1-1/2" of travel (3/4" Xmax) is kept completely linear through the use of dual spiders that also limit distortion and rocking modes. "Tall-boy" rubber surrounds with integrated gaskets maintain driver surface area during extreme excursion moments. Thick, one-piece Nomex honeycomb covered cones are covered with woven, heavy-duty glass fibers creating ultra-still cones that resist deformation.

A large copper sleeve and copper pole cap in the motor reduce energy storage from inductance, with the side benefit of lowering distortion for "faster" response. Large dual-stacked, high-energy magnets handle the heavy lifting and bring Qts down to a level where Ultimax subwoofers can be used in vented or sealed cabinets and enclosures.

A knock-down 2.0 cubic foot subwoofer cabinet built specifically for the Dayton Audio Ultimax 12" subwoofer is available here. Save 50% off the price of the cabinet when you buy the cabinet and UM12-22 subwoofer (at regular price) together in this package only.

Cabinet recommendations: 
• Sealed 2.0 cubic ft. (net internal) with 1 lbs. of Acousta-Stuf polyfill, f3 of 36 Hz with a 0.707 Qtc alignment
• Vented 4.0 cubic ft. (net internal, not including driver or port volume) tuned to 20 Hz with a 10" wide by 1.5" high slot port that is 25" long, which yields an f3 of 19 Hz

Note: All parameters derived with voice coils wired in series.

Product Specifications
  • Nominal Diameter12"
  • Power Handling (RMS)600 Watts
  • Power Handling (max)1200 Watts
  • Impedance2+2 ohms
  • Frequency Response20 to 1,000 Hz
  • Sensitivity84 dB 1W/1m
  • Voice Coil Diameter2.5"
Thiele-Small Parameters
  • Resonant Frequency (Fs)24.9 Hz
  • DC Resistance (Re)3.3 ohms
  • Voice Coil Inductance (Le)1.22 mH
  • Mechanical Q (Qms)3.45
  • Electromagnetic Q (Qes)0.71
  • Total Q (Qts)0.59
  • Compliance Equivalent Volume (Vas)2.53 ft.³
  • Mechanical Compliance of Suspension (Cms)0.21 mm/N
  • BL Product (BL)11.8 Tm
  • Diaphragm Mass Inc. Airload (Mms)193.2g
  • Maximum Linear Excursion (Xmax)19 mm
  • Surface Area of Cone (Sd)490.9 cm²
Materials of Construction
  • Cone MaterialNomex / Glass Fiber
  • Surround MaterialRubber
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerAluminum
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter12.38"
  • Baffle Cutout Diameter11.22"
  • Depth6.22"
  • Bolt Circle Diameter11.69"
  • # Mounting Holes8
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume2.8 ft.³
  • Sealed F334 Hz
  • Vented Volume5.58 ft.³
  • Vented F317 Hz
Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohms Per Coil
  • BrandDayton Audio
  • ModelUM12-22
  • Part Number295-512
  • UPC844632099250
  • Product CategorySubwoofer Drivers
  • Unit of MeasureEA
  • Product Rating
    (14 Reviews)
  • Weight24.95 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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Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohms Per Coil
Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohms Per Coil is rated 4.7857 out of 5 by 14.
Rated 5 out of 5 by from Amazing Subwoofer!I helped a couple of friends build two 12" Ultimax subs, housed in a 4 cu.ft vented enclosures, 4" X 12.25" Precision ports in front, tuned to 20Hz, and Yung 500W plate amps as power. Extensive bracing done and double front baffle. The result? Just an amazing subwoofer. Solid, deep bass that easily rocks my 30'X50' 3-car garage. Great product PE!
Date published: 2015-01-04
Rated 5 out of 5 by from UM12-22 for Car Subwoofer ApplicationI bought a single UM12-22 for use in a car subwoofer application for my son. We put it into a sealed 3 cuft custom box modestly stuffed with acoustic damping material. We use the two voice coils in parallel and drive them with a 500W rms (into 1 Ohm) mono-block amplifier. To me it is absolutely rearview mirror shaking, gut-wrenchingly awesome! My son says it is "Fire" (which apparently means really really good). I recommend using the maximum allowed power because this subwoofer (at least in a sealed box) soaks up power like a sponge. We use a typical head with just 20W per channel (but all HPF @80Hz) and component tweeters for the highs and get plenty of volume inside the car. I must say the sheer power and low-frequency extension are amazing. Awesome subwoofer driver - I love it!
Date published: 2014-12-31
Rated 5 out of 5 by from Awesome SubI recently aquired a passive 12" Cerwin Vega sub(huge box for those unfamiliar). The surround needed replaced but I decided to make this thing powered. I purchased this ultimax sub and the Dayton Sp500 plate amp. Sub was a perfect fit and 30 minutes later I had the amp installed. All I can say is WOW! I love the consistent quality and super fast shipping parts express brings. You guys rock and I am too! Thanks. Thinking of purchasing this sub, think no more, just do it!
Date published: 2014-09-18
Rated 3 out of 5 by from UnimpressedI bought this speaker because it was cheap when purchased with the enclosure kit, which I wanted to use with a B&C 12''. My 2 other subs are B&C 12'' and 18'' placed in custom enclosures. Those are impressive speakers. The Dayton Audio Ultimax is shamed when played next to B&C speakers. A good B&C 12'' could be had for about $150-250, and based on the sound quality difference, I would say that the Ultimax 12'' is not even worth the price.
Date published: 2013-09-15
Rated 5 out of 5 by from Excellent Subwoofer DriverThe Dayton UM12-22 is a 12" dual 2 ohm voice coil subwoofer with geneous excursion capability and moderate sensitivity. The cast frame with rubber gasket, cone, rubber surround, spider and magnet appear to be of high quality. The Thiele Small parameters measure close to specification and were esentially identical for both drivers tested. Performance and power handling in a completely filled 2 cubic foot enclosure is impressive. The output is clean and it handled everthing the BASH 300 plate amplifier could dish out. Frequency response reaches to nearly 20Hz with typical room gain. All-in-all a fine 12" subwoofer.
Date published: 2013-05-14
Rated 5 out of 5 by from first sub diy,,very happyI chose the 12" ultimax as my first diy sub design/build. I have it providing my low end with the 5 tri trix I have already built (3 sealed, 2 vented) I chose to build the slotted port 4.0 cubic feet net enclosure. I paired this sub with the BASH 500 amp placed in it's own box. I am very happy with the results so far. It is a very large box, but I love how "mean" it looks. i have cranked the system up and the sound is very clean and clear with zero distortion.
Date published: 2013-04-30

Product Q&A

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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.
Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohms Per Coil

Hi, Can I use the Crown NXLS1500 PN 245-502 or Crown NXLS2000 PN 245-504with two of these drivers? Thanks. 

Asked by: drawing blanks
Either of these amps will work, but the XLS 2000 will prodive a bit more headroom which is always a good thing with subwoofers. This is the model I would recommend.
Answered by: MattP
Date published: 2015-01-05

Looking to do  an infinite baffle setup in my SQ comp car. Would this be a good driver for that setup? If not can you suggest another 12.

Asked by: RaceShowDrive
This woofer will work well for that application.
Answered by: MattP
Date published: 2014-12-31

looking to build a good SQ system for my car. cant afford morels and stuff so im looking to get these. 2 in a sealed box for SQ. but it only lists sizes for HT boxes, not car audio. what ft^3 for 2 12" ultimax sealed?  ill be running roughly 1200RMS.

Asked by: Andrew S
These will work very well in 1.5 cubes sealed each for that application.
Answered by: MattP
Date published: 2015-01-03

How does the UM12-22 12" Ultimax DVC compare to the Titanic Mk4 12"

Asked by: Rensplace
The Titanic will require a smaller box volume for an optimally flat design. Because of this, the Titanic will have a higher F3, but room gain will come into effect and render this basically moot. If cabinet size is not a concern, the UM12 will probably reach lower in about 2.5-3 cubic feet sealed.
Answered by: MattP
Date published: 2014-12-02

Which of these three choices are my best option for a single HT sub as far as deep lows go: 12" Ultimax in a ported 6ft^3. 15" Ultimax in a sealed 3ft^3. 15" Ultimax in a ported 6ft^3. The last choice seems the most obvious...

Asked by: Dev1
This requires a bit more information in order to proceed. Please contact our tech support for more help with this question, tech@parts-express.com or 800-338-0531 x1.
Answered by: MattP
Date published: 2014-11-13

I have a Earthquake SLAPS 12" passive, I was considering pairing it with this in a 2 cu ft enclosure and a Bash 500,  would this be a good match enclosure?  The SLAPS has way more excursion capabilities if I am not mistaken.  Thanks

Asked by: The Shwortz
There is no real way to be sure how well it will perform without being able to model it. The Ultimax subs arent the best options for a ported or passive design unless the box volume is quite large. The Titanic Mk4 12" woofer might be a better option for this application.
Answered by: MattP
Date published: 2014-11-10


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