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

Brand:|Model: UM12-22|Part # 295-512
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.
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Part # 295-512
  • 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

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
  • Sensitivity86.7 dB 2.83V/1m
  • Voice Coil Diameter2.5"
Thiele-Small Parameters
  • Resonant Frequency (Fs)26.2 Hz
  • DC Resistance (Re)3.2 ohms
  • Voice Coil Inductance (Le)1.25 mH
  • Mechanical Q (Qms)3.62
  • Electromagnetic Q (Qes)0.71
  • Total Q (Qts)0.59
  • Compliance Equivalent Volume (Vas)1.65 ft.³
  • Mechanical Compliance of Suspension (Cms)0.14 mm/N
  • Diaphragm Mass Inc. Airload (Mms)270g
  • 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
    (19 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.

View similar products to the Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohms Per Coil
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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 4.5789 out of 5 by 19.
Rated 5 out of 5 by from Great Sub/Amp comboI bought the Dayton Audio UM12-22 12" Ultimax DVC Subwoofer and the 1000W Dayton amp to power it. Originally I planned to make a 4 cu ft. box with the amp mounted in the box but I had construction difficulties ( my design, way to complicated for what I needed), so the amp is external and the box is about 3.7 cu ft.It plays loud and deep. My room is about 5.500 cu ft. With the amp set at about 4 it vibrates not only the windows and the floor, but the solid oak table and the dishes in the cupboard in a nearby room. I live in a suburban neighborhood, but I suspect if I listened as loud as this goes for any length of time I would be getting a visit, not sure if it would be the police or the neighbors. Don't want that.As far as I am concerned, a sub should provide whatever the producer intended, with some in reserve. This system is more than capable of doing this at virtually any level, with nearly any source.
Date published: 2016-01-20
Rated 5 out of 5 by from Amazing SubSome people need to understand THIS IS NOT A COMPETITION SUB!!!!!! I read some feedback and can't believe my eyes. I bought two of these and all i can say is Amazing Sub. I have 2 Paradigm Seismic 12 and 2 Sunfire Bob Craver 12 Subs. One day i decided to build my own Subs. Used 1 DA UM12-22 Ultimax with 1 Earthquake Passive Radiator and DA 1000 Watt Amp. per Box Tuned Down to a 15Hz Sound is Actually Better than my Paradigm or Sunfire and we are talking $2000 Subs. Long story short Ignore Negative Feedback Just buy and you will see. Of course some knowledge is needed to achieve great Results but easy possible with this Monster. Thank you PE for Dayton Subs and Amps!!!!!!!!!!
Date published: 2016-01-19
Rated 1 out of 5 by from Plays low but quality is questionable.I bought this sub a couple months ago and installed in car using sealed specs, 2cu ft with about 600watts rms. After 45 days it stopped playing so removed it and found spider came unglued and tore from cone. PE was great and refunded my money but found this was an issue that was supposed to be fixed a while back, poor glue was used by Dayton. Apparently still a problem but it's sad because really liked the sound I got from it. Switched to SI Mag 3 for same price and that thing takes a beating, doesn't play as low but deff not concerned with build quality from SI.
Date published: 2015-09-13
Rated 5 out of 5 by from Impressed! Dual UM12's Infinite BaffleI've been eyeing these subs for some time to replace my existing dual 10" CDT HD1000's. The previous subs sounded great with plenty of output in a sealed enclosure, but they were excursion limited in low end output when I went infinite baffle.On paper these subs promised overall increased output, with a much flatter response down to 20 HZ, with no theoretical excursion limit reached with the 500 watts RMS I have available until 0 Hz. While I was a little concerned on power, typical IB setups require about half the power with all the output, so I figured I would give the Daytons a shot.I have to say I am more than impressed! I've only listened to them for a couple hours at this point, and they are still breaking in, but out of the box they sound amazing. The bass is fast, articulate, can play MUCH Louder, and seems cleaner/more defined than before. The 500 watts is more than enough to move these twin subs in an IB setup, however, if you're doing sealed or ported go ahead and double that to be safe.Build quality is amazing! Probably the nicest build quality I've seen in a sub. Casting is very clean and smooth, and the structure is extremely rugged with no apparent weak points. They are quite heavy, but they also need to be for the overall rigidity of the sub. The CDT's are nice subs, but in comparison the casting/frame structure is much thinner.Highly recommend these subs!Attaching a few photos of the project.
Date published: 2015-07-10
Rated 4 out of 5 by from Excellent driver but not right for home audioThe build construction was amazing. The problem for me was that the rubber surround was huge (1.3") and it wouldn't fit under the grill on my 2 cu. ft. Dayton Audio subwoofer cabinet. I think this sub will sound amazing in the right environment in a car audio setup or other environment where the driver can remain exposed.
Date published: 2015-07-04
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
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Product Q&A

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

does it come with two for the price it is?

Asked by: jakeburk2
These are sold individually
Answered by: Chrisf
Date published: 2016-02-04

I am going to run two 12" subs in 2.0 cubic foot sealed boxes. These will be run in a 2 channel setup strictly for music. I have it narrowed down to the Dayton-audio-um12-22-12-ultimax and the Eminence 12" Lab C. Which sub would work best? 

Asked by: mfell2112
Of the two, the Ultimax would be a better choice for that volume and have a lower natural F3. You might also consider the RSS315HF-4 as well, which will work equally well in that volume and arguably has a lower distortion motor for music playback.
Answered by: MattP
Date published: 2016-01-21

When I run the parameters I get very different numbers... For a QTC of .707 I get 3.77cuft sealed enclosure F3 of about 31hz, the listing states .707 @ 2cuft for an F3 of 36hz?

Asked by: dnadeau
You will get different numbers with different modeling programs. We use BassBox and "typical" stuffing for our calculations.
Answered by: MattP
Date published: 2015-12-30

do I just double the bassbox 6 specs for 2 subs to 11.16 ft3? if that is correct can you please advise me on how long of a 6" port I should use? thank you.

Asked by: LOUDinMcLEOD
A 6" diameter port would need to be 13" long for a tuning frequency of 19 Hz.
Answered by: MattP
Date published: 2015-12-14


Asked by: JOHHNY
If you wire the coils in series this will be a 4 ohm woofer.
Answered by: MattP
Date published: 2015-10-16

I'm installing this in a SVS 20-39 pci sonotube and was wondering if the 300 watt bash amp thats on sale right right now would be enough power. The reason for this amp is the dimensions are close to the old amp that removed .

Asked by: tibbyjr
300 watts will work for low to medium volume levels in most listening environments. If you want to get the most from the woofer I would recommend more power.
Answered by: MattP
Date published: 2015-10-09
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