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

Brand:| Model: UM15-22
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.
  • 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
Part # 
Weight: 35.3 lbs.  
Due In: 6/11/2015
List Price$259.99
You Save23%
Your Price
Buy 4-up$189.81
Part # 295-514
Qty:  EA
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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
  • Impedance2+2 ohms
  • Frequency Response15 to 1,000 Hz
  • Sensitivity86.5 dB 1W/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)2.4
  • 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
  • BL Product (BL)14.1 Tm
  • 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
    (22 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.

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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 22.
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 Cf.box. 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
Rated 5 out of 5 by from The AbyssI am using two of these subwoofers in an 8 cu.ft. internal enclosure, powered by a crown xls2500 amplifier. All I can say is HOLY GOD! My subwoofer was built and tested at Meniscus Audio in Grand Rapids. This subwoofer feels my entire house with deep, rich and powerful bass well below 20 hz.
Date published: 2014-07-19
  • 2015-05-24T08:04CST
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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

When wiring the coils in series, does that mean + to + and - to - + to - and + to - ? Does it matter?

Asked by: TPK1
Joining the positives together and then the negatives together will be parallel. series wiring would be + to amp, then take the negative on that side and jump it to the + on the other side and connect the amp negative to the last - terminal
Answered by: Chrisf
Date published: 2015-04-07

What size bolts do I use to mount this driver?

Asked by: Cardoski
I would recommend using #10-32, something like or part number 260-776 will work well.
Answered by: MattW
Date published: 2015-04-02

I decided to go with 4 of these instead of 8 12"s. 2 towers with 2 15"s @ 22.2ft3 each. use a crown XTi 4002 at 1600w x 2 channels @2ohms. also 2 6" precision ports at 18" each cab. is this enough power and are ports right? what is tuning expected? thx

Asked by: LOUDinMcLEOD
This will work out well. Two of those ports will tune the enclosure to 17 Hz.
Answered by: MattP
Date published: 2015-03-24

Can I use this in an IB like its 18 invh bigger brother?

Asked by: steve75g
Yes this will work well but it will run into excursion problems with about half its rated power so multiples would be recommended depending on the amount of output you want.
Answered by: MattP
Date published: 2015-03-17

Would the Ultimax be good for pro-audio use, for a bass guitar cabinet? I play bass and would like to use either one or two of these in a cabinet. I play just loud enough to blend in with the band and like deep bass.

Asked by: XR400
This would not be a good driver for that application. A bass guitar at the lowest will only need to reach about 30 Hz, 40 if it is a four string. This also lacks sensitivity and would require a huge enclosure. You would be much better off using a dedicated bass guitar speaker for an application like this.
Answered by: MattP
Date published: 2015-03-21

I have a 2 CF. Sealed box. This is set up in a Chevy van. How much fill would be needed to get best performance from UM15? & how much power should be supplied from amp?

Asked by: Dysasterpice
I would recommend about 2 pounds of fill for that volume, and 1000-1200 watts RMS at 1 or 4 ohms for this woofer.
Answered by: MattP
Date published: 2015-03-10
  • 2015-05-24T08:26CST
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