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.  
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
    (21 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 21.
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
Rated 5 out of 5 by from Exceeds expectationsI had high expectations going into this. I thought if it is nearly as good as I expect I would be very happy. So I built a roughly 3 cft sealed box for it, stuffed it as recommended and bridged an inuke1000 into 4 ohms on this (VCs wired in series) and it blew me away. I have it coupled with an Epik Empire and a 10" sealed B&W in an 1800cft room, and this sub literally wipes the floor with both of those, put together.It is very musical, it sounds great and unobtrusive, but plays with authority when it is called for. It plays every genre with ease and hardly breaks a sweat. That is what surprised me the most. I thought I would be using the empire and the B&W for music, and just turning this on for movies, but it is on all the time.For movies, it digs deep and provides a scary amount of tight, punchy bass. I like it so much, I just ordered a second one, and am going to sell the 10" sub and run two of these with the epik empire. It is a good match for that sub if anyone is looking for multiples who owns one.I cannot imagine wanting more from a subwoofer. Here is the link to my build with pics and graphs.http://www.avsforum.com/t/1529850/mcstyvies-15-sealed-sub-build
Date published: 2014-05-14
  • 2015-01-31T22:49CST
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Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
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Dayton Audio UM15-22 15" Ultimax DVC Subwoofer 2 ohms Per Coil

I would like to know the weight and dimensions for Dayton Audio UM15-22 15" Ultimax DVC Subwoofer 2 ohms when it packed for shipping

Asked by: gitarra
The box this woofer is shipped in is 20" x 20" x 12" and weighs about 35.4 lbs.
Answered by: MattP
Date published: 2015-01-13

I am building a 6.5 cf vented enclosure for the 15" Ultimax with 6lbs of fill.  What size port will this require?  Thanks

Asked by: bflossn
This box is on the small size for a ported design with this woofer. I would recommend keeping it sealed, but if you must port it It will require two 4" diameter, dual flared ports that are 36" long each. This will tune the box to 18 Hz.
Answered by: MattP
Date published: 2015-01-13

How many hours does it take to break-in an Ultimax sub? Are any special procedures helpful?

Asked by: rk1981
There is no set number, but 30-40 hours of normal playback will be enough to break in the suspensions on this woofer.
Answered by: MattP
Date published: 2015-01-05

Am building a pair of 11 cf gross ported subs using a 6" port. I will be adding 5lbs of Acouta-stff in each. My question is how much virtual volume is added by the damping and what length port should I use to tune the enclosure to 17hz?

Asked by: Bogner40
When I model using heavy fill in that volume, the port length will only need to be 15" for a 17 Hz tuning frequency.
Answered by: MattP
Date published: 2014-12-11

Hello was wondering how big of a ported box would i need for two of these bad boys? I wanna put them in a vehicle just not exactly sure how big the box should be. Also i got a 2000 watt hifonics amp will this be enough power for them or should i go bigger

Asked by: kaylob
This requires a bit more information in order to proceed. Please contact our tech support for more help with this question, tech@parts-express.com or 800-338-0531 x1.
Answered by: MattP
Date published: 2014-12-03

If I were to use the same 6 cubic foot box tuned to 17-18 hz with either an ultimax 15, or an ultimax 18, how would they compare? Spl wise and performance wise? If I'm feeding the same amount of power to either the 15 or 18, how would they compare then?

Asked by: FrancoisPaul
A 6 cubic foot box is quite a bit smaller that what is recommended for either of these options in a vented alignment. With a direct comparison however, using 6 cubic feet as the total volume after displacement, the response is identical. The advantage goes to the 18" for using half the excursion to get the same output using the same amount of power, but the port size is very large at 8" diameter and 60" long for that tuning frequency.
Answered by: MattP
Date published: 2015-01-05
  • 2015-01-31T23:38CST
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