Dayton Audio's Ultimax Series DVC subwoofers are purpose-built to move air
and create clean, articulate, fast bass. Optimized for small enclosures and with
over 1-1/4" of throw, the UM8-22 8" subwoofer is perfect for providing deep bass
without taking up much space. Experience the apex of subwoofer design.
Key Features
16 mm Xmax makes this one of the highest excursion 8" subwoofers on the
market
Thick, one-piece Nomex honeycomb covered cone with woven heavy-duty
glass-fiber
Tall-boy rubber surround for extra-long linear excursion without reducing
cone surface area
Dual linear stiffness spiders limit distortion and rocking modes
300 watts RMS power handling
Black anodized aluminum former and black pole improves heat dissipation
Dual 2 ohm, 2-layer copper voice coils
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. The thick, one-piece Nomex honeycomb cone is covered with
woven, heavy-duty glass fibers creating an ultra-stiff surface that resists
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
Product Specifications
Nominal Diameter 8"
Bolt Circle Diameter 7.75
Moving Mass Of Diaphragm (Mmd) 74.5
Power Handling (RMS) 300 Watts
Power Handling (MAX) 600 Watts
Impedance 4Ω
Frequency Response 30 to 800Hz
Sensitivity 84.2dB 2.83V/1m
Voice Coil Diameter 2"
Thiele-Small Parameters
Resonant Frequency (Fs) 31.6Hz
DC Resistance (Re) 4.2Ω
Voice Coil Inductance (Le) 1.14mH
Mechanical Q (Qms) 2.51
Electromagnetic Q (Qes) 0.75
Total Q (Qts) 0.58
Compliance Equivalent Volume (Vas) 0.75ft³
Mechanical Compliance of Suspension (Cms) 0.33mm/N
BL Product (BL) 9.1T·m
Maximum Linear Excursion (Xmax) 16mm
Surface Area of Cone (Sd) 211.2cm²
Materials of Construction
Cone Material Nomex / Glass Fiber
Surround Material Rubber
Voice Coil Wire Material Copper
Voice Coil Former Aluminum
Basket / Frame Material Cast Aluminum
Magnet Material Ferrite
Mounting Information
Overall Outside Diameter 8.27"
Baffle Cutout Diameter 7.44"
Depth 5.65"
# Mounting Holes 8
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity
suggestion)
Sealed Volume 0.35ft³
Sealed F3 49Hz
Vented Volume 0.75ft³
Vented F3 30Hz