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UM8-22 8" Ultimax DVC Subwoofer 2 Ohms Per Coil

Quick Overview

Dayton Audios Ultimax Series DVC subwoofers are purpose-built to move air and create clean, articulate, fast bass. Optimized for small enclosures, the UM8-22 8" subwoofer is perfect for providing deep bass without taking up much space. Experience the apex of subwoofer design.

Product Highlights

  • Thick, one-piece Nomex honeycomb covered cone with woven heavy-duty glass-fiber
  • Dual linear stiffness spiders limit distortion and rocking modes
  • Tall-boy rubber surround for extra-long linear excursion without reducing cone surface area
  • Black anodized aluminum former and black pole improves heat dissipation
  • 300 watts RMS power handling
  • Large vented pole piece and under-spider venting
  • Dual 2 ohm, 2-layer copper voice coils

Product Manuals / Spec Sheets / Downloads

Dayton Audio UM8-22 Specification Sheet
Dayton Audio UM8-22 Data Files

If you want outrageous amounts of bass, you gotta move some air

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.

The versatility you need for mobile, home, or pro subwoofer excellence

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.

Built to produce massive low frequency output and keep on doing it

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 1-1/4" of travel (.67" 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 strong motor takes you to wherever you want to be

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 0.35 cubic ft. (net internal), f3 of 49 Hz with a 0.8 Qtc alignment
• Vented 0.75 cubic ft. (net internal, not including driver or port volume) tuned to 30 Hz with a 10" wide by 1" high slot port that is 30" long, which yields an f3 of 30 Hz

Note: All parameters derived with voice coils wired in series.

Speaker SeriesUltimax Series
Model NumberUM8-22
List Price $168.99
Unit of MeasureEach
Warranty - Parts5 Years
Warranty - Labor5 Years
Product Shipping Weight (lbs.)15
Speaker TypeSubwoofer
Nominal Diameter8"
Power Handling (RMS)300 watts
Power Handling (max)600 watts
Continuous Program Power--
Impedance2+2 ohms
Sensitivity84.2 dB @ 2.83V/1m
Frequency Response30 - 800 Hz
Voice Coil Diameter2"
Magnet Weight--
DC Resistance (Re)4.2 ohms
Voice Coil Inductance (Le)1.14 mH
Resonant Frequency (Fs)31.6 Hz
Mechanical Q (Qms)2.51
Electromagnetic Q (Qes)0.75
Total Q (Qts)0.58
Diaphragm Mass Inc. Airload (Mms)74.5g
Moving Mass Of Diaphragm (Mmd)--
Mechanical Compliance of Suspension (Cms)0.33 mm/N
Surface Area Of Cone (Sd)211.2 cm²
Volume of Displacement (Vd)359.1 cm³
BL Product (BL)9.1 Tm
Compliance Equivalent Volume (Vas)21.30 liters
Maximum Linear Excursion (Xmax)16.0 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 Diameter209"
Overall Depth143.4"
Baffle Cutout Diameter197.5"
# Mounting Holes8
Mounting Hole Diameter--
Bolt Circle Diameter--
Product Weight--