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

Brand:| Model: UM15-22
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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.
A restocked/refurbished, or Open Box unit of the product is available -- see it now
  • 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
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Buy 4-up$189.81
Dayton Audio Baseball Cap
Qty: 1Part # 520-308
List Price:$19.99
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
    (20 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 20.
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.
Date published: 2014-05-14
Rated 5 out of 5 by from Far more than I expectedI put this in my eclipse gts in its recommended 3cuft box stuffed., firing up off the rear glass, and man, this thing. Produces krazy lows. And its like the lower note it plays, the louder it becones. The accuracy of this sub is great. Too. Ive owned stereo integrity, fi car audio, pioneer champion pro and this is the best bang. For the buck, esp any lower than 40hz.
Date published: 2014-04-21

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 just assembled this with a PE 3.0 cu ft cabinet (looks amazing).  I connected it to a Crown XLS 2500 amp bridge mode.  The sub is connected parallel and measures at 3.6 ohms with meter.  PROBLEM -- it is NOT LOUD AT ALL! ANy ideas?

Asked by:
Your amplifier should be able to drive this subwoofer well beyond its mechanical and thermal limits. I suspect your amplifier is not getting enough input voltage from your receiver. The XLS amps have RCA input jacks, but this is for use with DJ mixers that have higher output signal levels that are higher than what is put out by consumer audio gear. You will need some type of in-line preamplifier (such as an ART CleanBox or a 233-168 Talent SXC converter box to boost the level up to what the amplifier is normally used to seeing, and then you'll get full power from your amp.
Answered by:
Date published: 2014-11-21

umm...I'll make sealed cabinet. what is the best choice? 3.1 cubic ft? or 3.98 cubic ft?

Asked by: Enun
The difference between the two volumes is negligible to say the least. The larger volume will be closer to an optimal Qtc of .707 and have a marginally lower F3. If you can swing it, I usually opt for larger volumes with sealed enclosures to help the low end as much as possible.
Answered by: MattP
Date published: 2014-11-18

? For Matt, Cabinet recommendations:Vented 6.0 cubic ft. 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.  If I build a 8 ft3 cabinet vs 11 ft3, what would I lose over the 11ft3 cabinet? Home use

Asked by: Jonathan1970
A smaller volume will result in a higher tuning frequency unless the ports are lengthened in order to make up for it.
Answered by: MattP
Date published: 2014-11-10

I'm planning to build two sealed subs with 15" ultimax. What would be the difference between 3 and 4 cubic feet cabinet? I want better coverage in low frequencies. Or would 18" HO in 4 cubic feet cabinet be better for low 20 Hz and upper teens?

Asked by: Seung
Two separate subs will always outperform one, and two 15's will have quite a bit more cone surface area than a single 18". The difference between these volumes is negligible. I generally shoot for a slightly lower Q, which is a larger volume than optimal. Either volume with the UM15 will reach low 20's in room easily, and with a little EQ should reach well into the teens.
Answered by: MattP
Date published: 2014-10-06

Could you please tell me what the best box and port size would be for the 15" UM in a infra sub application? I have ample room for a large cabinet and our main stereo speakers have two tens each. I would like to emphasize the lowest of the lows. Thanks

Asked by: BW28
For the best low end performance, I would recommend 16 cubic feet total per woofer with a single 6" diameter port that is 19" long. This will tune the enclosure to 14.3 Hz.
Answered by: MattP
Date published: 2014-09-12

How would one 18" ultramax in a 15.0 ft3 vented cabinet (tuned for 'infra-sub HT use say at 16 Hz) compare to two 15" ultramax drivers, each in vented 7.5 ft3 vented box? 

Asked by: rainboss1952
Two subs will always be better than one in terms of room placement and filling out room nodes. Two of the 15's will have more cone surface area than a single 18 as well, so there is more output potential available.
Answered by: MattP
Date published: 2014-09-11


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