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
Regular Price$179.90
You Save11%
Sale Price
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
    (11 Reviews)
  • Weight24.95 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product contains 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 4.7273 out of 5 by 11.
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 $150-250, and based on the sound quality difference, I would say that the Ultimax 12'' is not even worth the price.
Date published: 2013-09-15
Rated 5 out of 5 by from Excellent Subwoofer DriverThe Dayton UM12-22 is a 12" dual 2 ohm voice coil subwoofer with geneous excursion capability and moderate sensitivity. The cast frame with rubber gasket, cone, rubber surround, spider and magnet appear to be of high quality. The Thiele Small parameters measure close to specification and were esentially identical for both drivers tested. Performance and power handling in a completely filled 2 cubic foot enclosure is impressive. The output is clean and it handled everthing the BASH 300 plate amplifier could dish out. Frequency response reaches to nearly 20Hz with typical room gain. All-in-all a fine 12" subwoofer.
Date published: 2013-05-14
Rated 5 out of 5 by from first sub diy,,very happyI chose the 12" ultimax as my first diy sub design/build. I have it providing my low end with the 5 tri trix I have already built (3 sealed, 2 vented) I chose to build the slotted port 4.0 cubic feet net enclosure. I paired this sub with the BASH 500 amp placed in it's own box. I am very happy with the results so far. It is a very large box, but I love how "mean" it looks. i have cranked the system up and the sound is very clean and clear with zero distortion.
Date published: 2013-04-30
Rated 4 out of 5 by from NiceI had some reservations about this driver being it has a small motor but pure morbid curiosity got the best of me. Built a 20.5" w x 22" w x 26"d ported and tuned to 22 hertz. Powered by an old PE 350 watt plate amp I had. Box is corner loaded in my room as this was purpose built for home theater. All I can say is nice. In my room it shakes the pictures on the walls and you can feel it through my concrete floors. If you need more than that, than I would move on. I am no carpenter but here are some pics. I know it looks like an SV$ but there is no port noise with the triple ports and gives me some options for tuning.
Date published: 2013-04-13
Rated 5 out of 5 by from Phenominal value in a bass driverIf you are looking for a bass driver for an all in one speaker, this one is a great choice. Being a 12" driver, you can set the crossover frequency high enough that it will unload whatever midrange you are using from excessive excursion requirements while still maintaining a reasonable radiation pattern. A 12" driver is essentially omnidirectional below around 300 Hz.In my application, I am crossing it over at 176 Hz using the Behringer DCX2496 with a L-R crossover at 24dB/octave to a 7" kevlar midrange. It blends very well with the midrange and has a ton of low bass and in a sealed box has good transient response.In this application, I am extremely satisfied. If I were going to build a separate subwoofer I would use the 15" version as it is almost the same price and the SD is 65% greater.If you are going to use this driver, have plenty of amplifier power because it can handle huge amounts. I am driving it with a Crown Studio Reference I that can put out over 1,100 watts/channel into 4 ohms. At around 80 Hz the amp will go into clipping before the driver complains. It is a real winner and I would recommend it highly
Date published: 2013-04-01
Rated 5 out of 5 by from Very ImpressedFirst off I have to say the room this is in is roughly 25'x27' with 22' ceilings with sub corner loaded. Box is built to spec (4cf tuned to 20hz slot port front firing, 1" face 3/4" box with skeleton bracing) powered by SPA500. I would recommend the SPA1000 amp though because it likes power.Music wise as long as your mains can handle 50hz and up it blends and sounds incredible. If I planned to do more music with it I would tune slightly higher.HT use.....IT GOES DEEP!! In a room that is huge, I've tried countless subs in, and seen so many overrated specs this sub truly lives up to it's specs. No port noise, no weird weird dips in the frequency. Only complaint I have is I only have one right now so time to build another!Side note: I tried it in a 2cf sealed box and was just so-so. Sealed would probably work very well in a SUV/van or a small room
Date published: 2013-02-24

Product Q&A

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who own this product or have experience with it.
If your question requires design or troubleshooting information,
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Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohms Per Coil

Would these subs preform well in a 4th order bandpass 1.5 sealed 2.0 ported tuned to 45 hz

Asked by: mrtaylor15
It will work, but only if your intend is to play loud between 40-50 Hz. Otherwise it will not play low and in my opinion not utilize much of this woofers potential.
Answered by: MattP
Date published: 2014-09-15

I am wanting to put this Subwoofer into a custom built Aperiodic Bi-Chamber box. However I am having trouble deciding on a front firing enclosure or a down firing enclosure. Any suggestions, or advice?

Asked by: LukeRBraxton
The orientation of the driver makes no difference at frequencies below ~100 Hz. If you have pets or children with curious fingers, a downfiring sub may be your best bet.
Answered by: MattP
Date published: 2014-08-13

Is the 600 Watt power rating for each coil or is it total power for both.

Asked by: DaveH102462
The power rating on this speaker is for both coils together.
Answered by: MattP
Date published: 2014-07-21

Got this setup a few days ago in the 2cu ft knockdown box with a yung 500w no boost. What would you recommend the gain set at? Have it around 11o'clock right now. Still in the break in period but sound decent. Waiting to rate til I have more hours on it.

Asked by: audiophizile
There is no right or wrong answer when it comes to the gain setting for any given system. The sub needs to blend well with the main speakers in terms of output and what sounds good to your ear. If it sounds good now there is no real reason to change it. Room placement will have more of an effect on a subwoofers performance than anything else.
Answered by: MattP
Date published: 2014-07-21

Planning on this with the 2.0 cu ft sealed box and in a 16x12 room with standard height ceilings. My goal is tight, accurate bass comparable to my jl 10w7 powered by 500w in my car. Would a 500w amp be enough for this or would 1000w give more accuracy?

Asked by: audiophizile
The volume of 2 cubic feet is perfect for this subwoofer and I would recommend 1000 watts for added headroom. It is not wise to compare a home sub to a car sub since they are completely opposite applications.
Answered by: MattP
Date published: 2014-07-01

How would one of these 12" ultimax subs compare to 4 10" SD270A-88's? both powered by a 500W yung amp?

Asked by: HellaFab
Multiple subs are always better than one simply for placement purposes.The four SD270 subs will have much more sensitivity and play louder overall, however in order to compete at the low frequencies they will each require a ported box that is 4 cubic feet with a 3" diameter port that is 6" long. The single UM12 only requires a 3 cubic foot sealed box.
Answered by: MattP
Date published: 2014-01-31


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