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 together in this package.

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 *
  • 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
    (14 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 14.
Rated 5 out of 5 by from ULTIMAX is the ultimateJEEP! Car audio application: 2 ultimax 15s, box is 8.8 ft3 after sub, port, and bracing, tuned @ 32.5 hertz, wired in series / parallel for a 2 ohm load, way underpowered as my amp is running 1100 - 1300 watts / rms @ 2 ohms. This is REAL bass pullin off hair tricks with only 2 subs and 1200 watts rms... 20 - 45 hertz these subs are blowin the competition away, and with the only COMPARABLE subs being triple the money+++ and those needing 5000 watts rms +++ and that many watts needs H/O alternator wich is also big $$$$$. pound for pound and dollar for dollar there is not a better sub on the market. If you want STRONG , CLEAN , LOW , CLEAN , DEEP , CLEAN , SUPER LOUD and CRYSTAL CLEAN SUBS GET ULTIMAX and DONT waste your time or money on disappointing subs that dont have ultimate bass that plays to the max. I will never buy any other sub ever. in the near future i will get 2 more for my girls jeep, and even 2 more for my home theater... Ultimax # 1 sub for LOW LOUD and CLEAN.... The most bang for your $$$$$$$$$$$$$$$$$$$
Date published: 2014-04-16
Rated 5 out of 5 by from Good LordI have the 15 inch model in a sealed box in my trunk powered by a 1200 watt amp at 1 ohm. This thing slams. The bass hits low tight and clean. Absolutely would recommend this sub to anyone bass enthusiast or otherwise.
Date published: 2014-04-15
Rated 5 out of 5 by from Yes!Yes! That's all I can say about this thing. I just received this behemoth a few weeks ago, and other than weighing 30,000 pounds, it is an amazing sub. Simple to hook up. I have (2) of the Ultimax 15" subs and 3cu/ft box combo's, and I currently only have one hooked up. I could not imaging having both of them hooked up in the same room. I have this powered with the Dayton 1000w Rack mountable amplifier, and one of them in a 3cu/ft box has no problem putting out 20hz with authority and shaking pictures off the walls!
Date published: 2014-03-07
Rated 5 out of 5 by from Great sub for large roomsI have only had this sub installed for a few days, but it is exceeding my expectations. I installed it in the recommended 6 cu ft ported enclosure with two 4" diameter ports, 26 inches long, 6 lbs of polyfill. Sub sounds great in a large room (3200 cu ft +/-). I don't have measuring equipment, so I can only provide my listening impressions. The sub is loud and articulate. Just one sub shakes the house. I am using it in a corner-loaded application with the speaker backfiring. It's better for movies and games than music in this application. It really shakes the house and hits the low notes with authority. I have not had the time to calibrate, so I am using it in its raw, unadjusted state. Performance should improve even further with proper calibration and break-in. Very good sub. I can't imagine that you can find one better for the money.
Date published: 2014-01-24
Rated 5 out of 5 by from Outstanding value!First and foremost, i am used to quite good subs. Ive owned a svs pc13 ultra and have heard some other rather expensive subs.I wanted to do something of my own and im glad i did. I chose the ultimaxes because they were new and exciting. From the start i was about to do two of them. Then it grew to four. Now i own eight of these babies in a 13x15 feet room. TTheyare in sealed 4ft^3 cabinets and gives output in the one digits, as low as five hz i can still shake the apartment. These are incredible value for money. My god they can play deep powerful bass. Very pleased i am. Need more i do. Move to bigger room i must :)
Date published: 2014-01-25
Rated 5 out of 5 by from AMAZING, AWESOME, STUNNING, STUPENDOUS, UNBELIEVABLE, etc, etc.First off let me say that I’m definitely not new to powerful subs. (A lot of the time I don’t know how much faith to put in reviews when the author gives no reference to other equipment so I try to make it obvious where I’m coming from.) I’ve built and installed at least seven different subwoofer boxes in various automobiles, and I have used multiple commercial home theater subwoofers from JBL to Sunfire with average RMS power ratings of about 500-1200 watts. Some subs I was very impressed with (like the Sunfire MKII) and others not so much. My current home theater subs are the built-in 12” CMMDs in my Infinity IL60s, which I have been very satisfied with in a 22’ X 12’ X 9’ home theater room. I would also like to state that I demand clean, low (15-30Hz), powerful, articulate bass.Having said all that, my first impression of the 15” Ultimax is: WOW! This thing is insane! It is by far the single best, most capable LF driver I have ever used. I purchased it with the 3.0 ft^3 knock-down cabinet (300-7082) just so I would have something to slap together and demo it. Unfortunately, the knock-down cabinet that PE sells for this driver is woefully insufficient for the power of this beast. I built the cabinet using Gorilla glue and brad nails (2” spacing), caulked every seam in the interior with silicone, and added the recommended 3 lbs. of Acousta-Stuf. The glue had five days to cure since I assembled the cabinet on Monday and didn’t install the driver until Friday. I connected the voice coils in series then hooked it up to a Crown XLS1500 in bridged bypass with the amp being fed from the sub output of a Behringer FBQ1502. The problem is, when testing this setup, I sat on the box and the perceived vibration seemed to be almost as much as the driver. With a 0dB (un-attenuated) input signal to the amp, I got the dial on the XLS about 60% of the way up (enough to constantly light up the -20dB indicator on the XLS) before I could no longer stand the volume. The maximum excursion I noticed at that level was about ¼”, which is nowhere near max. I ended up turning it down to just three clicks from the bottom for an extended break-in period.As far as sound quality goes, with no EQ it had excellent response down into the low 20s. Adding a little bit (6dB max) of 20Hz boost gave my eardrums just about all the subsonic pressure they could handle without rupture. While this testing was happening in my rec room, I shut off the amp for the HF drivers and just let the sub play. That’s when I noticed my pinball machine and ping pong table (1” MDF playing surface) rattling up a storm. Crazy. Everything I’ve played on it has sounded clean and tight. Anything short of perfection I have to attribute to the insufficient box that the driver is installed in. As far as what kind of enclosure it SHOULD be put it in, that’s a good question. At a minimum I would recommend an enclosure similar to the one PE sells, but with no less than 1.5” thick walls—and even then I would probably add some concrete to the design just to keep the vibrations to a minimum. Eventually I plan to build another enclosure for this monster using a double layer of ¾“ MDF with about ½” of concrete in between for some serious damping.The bottom line: if you’re thinking about buying this driver, just do it. You absolutely won’t regret it.
Date published: 2014-04-06

Product Q&A

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

Ultimax 15" for car audio application

I was looking at the different Dayton subwoofers, and found this one to be the most attractive, and the beef-iest looking. It was also the most expensive, sometimes suggesting the best. What would be the best enclosure be to get the best, loudest, and most consistant response? I am leaning towards ported, and probably around 33hz i'm guessing? That seems to be the magic number in car audio. Would this sub be suited to car audio application? Would the 15" be a good choice? And how would the 15" sub hold up in various styles of music, say, death metal, classical, rap, and techno? Also, i am open to suggestions about other DIY subwoofers. I just really want to know about this one as well.-Best regards
Asked by: Daniel1317
This woofer will work well in a car audio application but I would not recommend porting. Throw this in a 3 cubic foot sealed box and you will have very smooth response into the low 20's with cabinet gain. It will work for all types of music.
Answered by: MattP
Date published: 2013-10-11

Will this woofer work in a (car audio) infinite baffle configuration? If so, what could we expect the power handling to be limited to?

Asked by: adamand
This woofer isn't an IB woofer. I believe dayton does have an IB series though, I could be wrong. There was another question similar to yours, and the guy who answered it gave a model number. Go check that out.
Answered by: Biggoat
Date published: 2014-01-24

ultimax or reference?

im stuck between deciding to get two ultimax 15s or one reference 18. I want high SPL at lower frequencies but without compromising SQ.
Asked by: Dexx
Either woofer will be an excellent choice. The enclosure sizes will be similar assuming you stick with a sealed design which is recommended. They both will play into the low 20's in room but the 18" will "do less work" to get there.
Answered by: MattP
Date published: 2014-01-24

Acousta-Stuf polyfill

Say I use a full 5 lb bag Acousta-Stuf polyfill instead of the 3 lbs that is recommended. What does this do for end numbers? As far as tuning. etc.
Asked by: Swishahouse6
If you use much more stuffing than recommended, you may wind up with an overdamped enclosure alignment, which might sound like "less" bass, or bass that is lacking in weight. Depending on your room and placement, you may want more or less damping, so having the extra polyfill on hand would be useful in case you want to experiment with adding the whole bag in case the bass is boomy in your chosen subwoofer location.
Answered by: RoryB
Date published: 2014-01-24

This looks very similar to the adire audio tumult... any relation? :)... I've got one of those and it'd be great if these matched..

Asked by: toomanyspeakers
The 15" Ultimax model has significant architectural differences from the no-longer-available Adire Audio Tumult. First of all, it does not use the dual-gap underhung architecture of the Tumult driver; the Ultimax motor is a typical overhung design to make the most effective use of the available magnetic flux. Second, the Ultimax drivers deliver a Klippel-verified 23mm Xmax; the Tumult was capable of more, but was also much more expensive. The Ultimax 15" driver doesn't have quite the same displacement as the Tumult driver, but delivers quite a bit more displacement per dollar.
Answered by: RoryB
Date published: 2014-01-24

15" Titanic Vs. 15" Ultimax

I've been planning a sealed 15" Titanic subwoofer for 50% music and 50% HT. Now the Ultimax shows up.So I; and I think other viewers, would benefit if someone would be so kind as to model these two against one another using Bassbox Pro, Winisd or another program. Knowing what program was used may help other viewers.Here is what I think would help others and myself. Some of my suggestions might be off here, a newbie.Compare the two in a 3 cubic feet gross (not net) sealed enclosuer and assume a 12db per octave low pass filter at 80hz.15" Titanic MKIII in a 3 cu. ft. sealed enclosure:QTC:F3:F10:SPL at 100 watts:Cone excursion at 100 watts:Maximum power before mechanical problems:Distortion?:15" Ultimax in a 3 cu. ft. sealed enclosure:QTC:F3:F10:SPL at 100 watts:Cone excursion at 100 watts:Maximum power before mechanical problems:Distortion?:
Asked by: Dayton Fan
15" Titanic MKIII in a 3 cu. ft. sealed enclosure:QTC: 0.729F3: 40.71 HzF10: 24.17 HzSPL at 100 watts: 109.4 at 77 Hz.Cone excursion at 100 watts: 5.14mmMaximum power before mechanical problems: Cone excursion at 800 watts is 14.5mm. This does not mean the driver will handle higher power levels, its thermal rating will not change.Distortion?: N/A15" Ultimax in a 3 cu. ft. sealed enclosure:QTC: 0.769F3: 34.18 HzF10: 20.53 HzSPL at 100 watts: 107.8 at 93.99 HzCone excursion at 100 watts: 5.58mmMaximum power before mechanical problems: Cone excursion with 800 watts is 15.8mm.Distortion?: N/A
Answered by: MattP
Date published: 2014-01-24


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