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

Brand:|Model: UM12-22
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.
Due In: 12/8/2015
List Price$233.99
You Save23%
Your Price
Buy 4+$170.91
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
    (17 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
in the Subwoofer Drivers product category.


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 4.5294 out of 5 by 17.
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
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
  • 2015-11-27T06:19CST
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Product Q&A

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


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

Can you run 2  Dayton ultimax 12" dual 2 ohm subwoofers together to one 4 ohm load ? I want to run them to my crown Xls 1500 in bridge mono To one 4 ohm load 

Asked by: Proverbs
Unfortunately no, you can only wire two of these together for a 2 or 8 ohm load.
Answered by: MattP
Date published: 2015-09-28

Hello, I'm currently running a 10" Ultimax in a 2 cu ft ported enclosure tuned to ~23Hz. What performance differences would I see making the ported box sealed and going with a 12" Ultimax instead?  Also, will the 12" work in 1.05 cu ft sealed?

Asked by: dtsdig
Both have flat responses in either alignment. A ported sub will always have a more authoritative "feel" down low, a sealed sub will sound more laid back. The 10" ported also doesn't do much below the tuning frequency, whereas the sealed 12" will still have play room and a shallower roll off. Both will have similar output capability. I would not recommend using the 12" in that small of a volume.
Answered by: MattP
Date published: 2015-08-31

is the rating for 600 watts per voice coil, which if I'm correct would result in 1200 watts in 4 ohms?

Asked by: Jarret
No, the power rating is for both coils combined.
Answered by: MattP
Date published: 2015-06-16

Im thinking about getting 2 um12 for my car powering with 1500 rms amp i would like to use a vented box how big does the box has to be to get optimal performance out of them and how do they compare to kicker 12L7 as this is my current sub 

Asked by: Dave629
Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-04-20
  • 2015-11-27T06:50CST
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