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

Buying Options

Dayton Audio UM8-22 8" Ultimax DVC Subwoofer

Experience the Apex of Subwoofer Design

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.

Built To Move Some Air

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. The thick, one-piece Nomex honeycomb cone is covered with woven, heavy-duty glass fibers creating an ultra-stiff surface that resists deformation.

Dayton Audio UM8-22 Frequency Response

Industry Leading Motor Strength

Ultimax subwoofer upside down showing the motor

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.

Unmatched Versatility

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.

Cabinet Recommendations:

  • Sealed: 0.8 cubic ft. (net internal, not including driver volume) produces an f3 of 43 Hz with a 0.74 Qtc alignment
  • Vented: 1 cubic ft. (net internal, not including driver or port volume) produces an F3 of 25 Hz

Key Specs:

  • Nominal Diameter: 8"
  • Power Handling (RMS): 300W
  • Power Handling (MAX): 600W
  • Impedance: Dual Voice Coil, 2Ω+2Ω
  • Frequency Response: 30-800Hz
  • Sensitivity: 83.5dB 2.83V/1m
  • Voice Coil Diameter: 50.8 mm
  • Maximum Linear Excursion: 16 mm

Speaker Series Ultimax Series
Model Number UM8-22
Color Black
Unit of Measure Each
UPC 848791002205
Warranty - Parts 5 Years
Warranty - Labor 5 Years
Product Shipping Weight (lbs.) 15
Speaker Type Subwoofer
Nominal Diameter 8"
Power Handling (RMS) 300 watts
Power Handling (max) 600 watts
Continuous Program Power --
Impedance 2+2 ohms
Sensitivity 83.5 dB @ 2.83V/1m
Frequency Response 30 - 800 Hz
Voice Coil Diameter 50.8 mm
Magnet Weight --
DC Resistance (Re) 4.2 ohms
Voice Coil Inductance (Le) 0.73 mH
Resonant Frequency (Fs) 34.3 Hz
Mechanical Q (Qms) 2.47
Electromagnetic Q (Qes) 0.87
Total Q (Qts) 0.64
Diaphragm Mass Inc. Airload (Mms) 81.2g
Moving Mass Of Diaphragm (Mmd) --
Mechanical Compliance of Suspension (Cms) 0.27 mm/N
Surface Area Of Cone (Sd) 211 cm²
Volume of Displacement (Vd) 336 cm³
BL Product (BL) 9.2 Tm
Compliance Equivalent Volume (Vas) 16.6 liters
Maximum Linear Excursion (Xmax) 16 mm
Drivers Mechanical Losses (Rms) --
Cone / Diaphragm Material Nomex Cone
Entry / Exit Diameter --
Surround Material Rubber
Voice Coil Wire Material Copper
Voice Coil Former Aluminum
Basket/Frame Material Cast Aluminum
Magnet Material Ferrite
Overall Outside Diameter 210 mm
Overall Depth 119.5 mm
Baffle Cutout Diameter 189 mm
# Mounting Holes 8
Mounting Hole Diameter --
Bolt Circle Diameter --
Product Weight --