Manuals & Resources

Dayton Audio UM15-22 15" Ultimax DVC Subwoofer 2 ohms Per Coil

Brand:|Model: UM15-22
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.
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Qty: 1Part # 520-308
List Price:$19.99
Part # 295-514
  • Sweeps massive amounts of air!
  • Over 1-1/2" of total cone travel
  • 800 watts RMS power handling
  • The latest in subwoofer technology
  • Dual linear stiffness spiders limit distortion and rocking modes
  • Dual 2 ohm, 2-layer copper voice coils
  • Large vented pole piece and under-spider venting

Product Details

Dayton Audio UM15-22 15" 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 3.0 cubic foot subwoofer cabinet built specifically for the Dayton Audio Ultimax 15" subwoofer is available here. Save 50% off the price of the cabinet when you buy the cabinet and UM15-22 subwoofer (at regular price) together in this package only.

Cabinet recommendations: 
• Sealed 3.1 cubic ft. (net internal) with 3 lbs. of Acousta-Stuf polyfill, f3 of 35 Hz with a 0.707 Qtc alignment
• Vented 6.0 cubic ft. (net internal, not including driver or port volume) with 6 lbs. of Acousta-Stuf tuned to 18 Hz with two 4" diameter by 26" long flared ports for an f3 of 22 Hz. Larger cabinets and lower tuning frequencies are possible. 

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

Product Specifications
  • Nominal Diameter15"
  • Power Handling (RMS)800 Watts
  • Power Handling (max)1600 Watts
  • Impedance4 ohms
  • Frequency Response15 to 1,000 Hz
  • Sensitivity86.5 dB 2.83V/1m
  • Voice Coil Diameter2.5"
Thiele-Small Parameters
  • Resonant Frequency (Fs)19.5 Hz
  • DC Resistance (Re)3.4 ohms
  • Voice Coil Inductance (Le)1.31 mH
  • Mechanical Q (Qms)2.40
  • Electromagnetic Q (Qes)0.59
  • Total Q (Qts)0.47
  • Compliance Equivalent Volume (Vas)7.92 ft.³
  • Mechanical Compliance of Suspension (Cms)0.24 mm/N
  • Diaphragm Mass Inc. Airload (Mms)279.4g
  • Maximum Linear Excursion (Xmax)19 mm
  • Surface Area of Cone (Sd)814.6 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 Diameter15.28"
  • Baffle Cutout Diameter13.78"
  • Depth7.55"
  • Bolt Circle Diameter14.65"
  • # Mounting Holes8
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume3.98 ft.³
  • Sealed F333 Hz
  • Vented Volume11.1 ft.³
  • Vented F317 Hz
Dayton Audio UM15-22 15" Ultimax DVC Subwoofer 2 ohms Per Coil
  • BrandDayton Audio
  • ModelUM15-22
  • Part Number295-514
  • UPC844632099267
  • Product CategorySubwoofer Drivers
  • Unit of MeasureEA
  • Product Rating
    (23 Reviews)
  • Weight35.3 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 UM15-22 15" Ultimax DVC Subwoofer 2 ohms Per Coil
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Dayton Audio UM15-22 15" Ultimax DVC Subwoofer 2 ohms Per Coil
Dayton Audio UM15-22 15" Ultimax DVC Subwoofer 2 ohms Per Coil is rated 5.0 out of 5 by 23.
Rated 5 out of 5 by from Insane!I am not normally a person to write reviews about products but this is definently one that needs the extra gratification. The look of the subwoofer alone was almost enough for me to give the beast a shot at my setup which is in my apartment in college (yes I have gotten 2 noise complaints already). I have done custom car and boat audio for over 6 years and have had my experience with many diverse speakers. This setup was something I put an extreme amount of time into and it turned out flawless. This subwoofer just absolutely SLAMS. I only have it ran off of a BEHRINGER NU1000 INUKE 1000 watt amp and you can tell that the subwoofer could EASILY take another 600 watts before it would even start to sweat. My buddy lives in the building next to mine and a floor up (approx. 30-40 yards) and we've tested the bass travel and when its running at full tilt the stuff on his walls would be shaking. Its very clean and is much more punchy then I expected it to be, which for me, is perfect because I listen to a lot of skrillex and dubstep (club music). As for the rest of the equipment the highs are crystal clear and practically make your ears bleed if you have it full tilt for more than 15 seconds. All in all the subwoofer is a beautiful piece of art and creates the deep bass atmosphere effortlessly.
Date published: 2015-06-05
Rated 5 out of 5 by from Great sub!Great sub for the $. I originally had this sub in a 2 cf. Sealed box. ( " small mistake") operating at 1 ohm at 2000 watts in my service van behind drivers seat. Two problems occurred, 1- box too small, & 2- dimming lights due to excessive current draw from amp. Before this sub was installed I had another 15" running at 2 ohms, & had no electrical issues. So , I called tech support, for a ported box design. I am not a fan of round ports, so I opted for a slot load port. After speaking with Herb in tech support, & working around the size of the enclosure, I ended up with a, 18.5"Wx1"Hx26"L port in a 3.2 This set up was more efficient than a sealed box, & I was able to wire the sub for a 4 ohm load, sacrificed power output from amp down to 700watts, reduced current draw on electrical system,& achieved good results. This sub is power hungry, so I plan on up grading amp for more power in the near future.Please keep in mind that this is in a work van, nothing fancy, just looking for added low frequencies. I would definitely buy another UM 15 if the need arises. My only complaint would be lack of voice coil impedance choices.
Date published: 2015-04-09
Rated 5 out of 5 by from Great Sub, musical and great for moviesHi Everyone,I have had this sub for maybe 6 months now. Sounds wonderful. Great sub for the money. I just finished my Youtube video of the build. Search on Ultimax 15: The Copper Box That Rocks.
Date published: 2015-01-03
Rated 5 out of 5 by from Big bang for the buckWow, very well rounded speaker. great sound quality, good amount of volume, pushes a lot of air . I have it in 2.5 cubic ft modified ground shaker ported box highly dampened and braced. for a big speaker has excellent punch, very quick and best of all it goes very low
Date published: 2014-10-06
Rated 5 out of 5 by from goodI just playd it in, and it's evil low bass. All i can say i buy !
Date published: 2014-09-27
Rated 5 out of 5 by from Great down to 10 HzUsed 11.7 Cu Ft Enclosure with 6" round port 18" Long and it is awesome!!!!
Date published: 2014-08-08
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Product Q&A

Get your questions answered from other customers
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Dayton Audio UM15-22 15" Ultimax DVC Subwoofer 2 ohms Per Coil

Just bought 2x Ultimax 15" for a dedicated Home Theater. I understand tuning should be <20Hz for extension >30Hz for stomach punch. Is that so? Would convenient to tune each differently? Recommended vol is 6 ft^3. Why >11 ft^3 is better? Thank you!!

Asked by: Marcelo
Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-10-02

I bought the 15" bundle package and love it.  Want a 2nd, was thinking of adding the 18 ultimax bundle.  Would this be advised or just stick with another 15?  Powering with a inuke6000dsp 

Asked by: PartyMarty
I would just add another 15" and call it a day. You won't gain much more by going with the 18.
Answered by: MattP
Date published: 2015-09-18

In a car audio application i have about 1.85 cubic feet for a sub will this woofer work in that area? If so what amount of poly fill would be recommended?

Asked by: stevenH68
You'd be much better off with the 12" model in that size enclosure.
Answered by: DavePV
Date published: 2015-09-13

I'm considering mounting 3 of these in a ported box that can be up to 20" high, 65" wide, and 120" deep. (under a stage). It's a pro environment with 80% DJ Music and 20% Live music. Am I on the right track or should I choose a different driver/config?

Asked by: utbroker
I would not recommend this driver for a PA/pro sound application. It lacks sensitivity and the bottom end this driver is capable of is simply not required for that. Using something like three Sigma Pro 18's from Eminence would produce way more output and still fit in the required space, using less overall power. Three Sigmas would require an enclosure that is 20"H x 65"W x 25"D with two slot ports that are 18.5"H x 4"W x 18"D each which will tune to 34 Hz and produce peak SPL of 137 dB without room gain considered. Three of the UM15's would only produce about 123 dB peaks at the same tuning frequency, require a lot more power due to the wiring configuration and cost more up front.
Answered by: MattP
Date published: 2015-08-31

What's the size of the magnet?

Asked by: ImTooOldForNicknames
Magnet weight is not a published parameter. Usually the magnet assembly is 75-80% of the total driver weight, so in this case the magnet weight is around 280 oz.
Answered by: MattP
Date published: 2015-08-12

I have an older Crest Vs1500 amp, would this be a good choice to power this sub (bridged at 4ohm) in the sealed enclosure (part#300-7082) and what would the recommended tuning be for a DSP crossover?

Asked by: Trumpet
That amp will be plenty for this woofer. The DSP settings and tuning depend entirely on the room the sub will be in, there is no way to give you specific answers for this unfortunately.
Answered by: MattP
Date published: 2015-07-14
  • 2015-10-04T15:22CST
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