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UM15-22 15" Ultimax DVC Subwoofer 2 ohm Per Coil

Quick Overview

Dayton Audios Ultimax Series DVC subwoofers are purpose-built to move air and create clean, articulate, fast bass. Experience the apex of subwoofer design.

Product Highlights

  • 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 Manuals / Spec Sheets / Downloads

Dayton Audio UM15-22 Specificiation Sheet
Dayton Audio UM15-22 Data Files

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.

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.

Speaker SeriesUltimax Series
Model NumberUM15-22
List Price $259.99
Unit of MeasureEach
Warranty - Parts5 Years
Warranty - Labor5 Years
Product Shipping Weight (lbs.)28
Speaker TypeSubwoofer
Power Handling (RMS)800 watts
Power Handling (max)


600 watts

Continuous Program Power--
Impedance4 ohms
Sensitivity86.5 dB @ 2.83V/1m
Frequency Response

15 - 1

000 Hz

Voice Coil Diameter63.5 mm
Magnet Weight--
DC Resistance (Re)3.4 ohms
Voice Coil Inductance (Le)1.31 mH
Resonant Frequency (Fs)19.5 Hz
Mechanical Q (Qms)2.4
Electromagnetic Q (Qes)0.59
Total Q (Qts)0.47
Diaphragm Mass Inc. Airload (Mms)279.4 g
Moving Mass Of Diaphragm (Mmd)--
Mechanical Compliance of Suspension (Cms)0.24 mm/N
Surface Area Of Cone (Sd)814.6 cm²
Volume of Displacement (Vd)


548 cm³

BL Product (BL)15.4 Tm
Compliance Equivalent Volume (Vas)224.3 liters
Maximum Linear Excursion (Xmax)19 mm
Drivers Mechanical Losses (Rms)--
Cone / Diaphragm MaterialNomex Cone
Entry / Exit Diameter--
Surround MaterialRubber
Voice Coil Wire MaterialCopper
Voice Coil FormerAluminum
Basket/Frame MaterialCast Aluminum
Magnet MaterialFerrite
Overall Outside Diameter388 mm
Overall Depth226 mm
Baffle Cutout Diameter350 mm
# Mounting Holes8
Mounting Hole Diameter--
Bolt Circle Diameter--
Product Weight--