UM18-22 18" Ultimax DVC Subwoofer 2 ohm Per Coil

18" design for enormous air movement

RRP $853.15
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Dayton Audio’s Ultimax Series DVC subwoofers are purpose-built to move tons of air and create clean, articulate, “fast” bass. Experience the apex of subwoofer design!

With the UM18-22 Ultimax 18” driver, Dayton Audio has taken everything about the respected Dayton Audio Ultimax subwoofers to the extreme! Providing over 2” of peak-to-peak excursion, the Ultimax 18 sweeps over six liters of air with each stroke! Truly not for the faint of heart!


Like the rest of the Ultimax series, the UM18-22 plays it clean, low, fast, and LOUD. Designed to excel in either sealed or vented enclosures, it features an ultra-powerful triple stack of high-grade ferrite ceramic magnets for ultra-high force and exceptional control, plus dual aluminum shorting rings above and below the magnetic gap for minimized inductance, “faster”-sounding bass response, and perfect magnetic symmetry. The voice coil diameter has been increased to 3 inches, for even more thermal dissipation area that allows the 18” model to withstand 1000 watts of punishing bass power continuously without thermal fatigue. Dual 2-ohm voice coils allow for stereo 2 ohm operation, or mono operation in 1 ohm or 4 ohm configurations, for true design flexibility.

The huge 18” Nomex honeycomb composite curved cone features woven fiberglass outer skins for the ultimate in rigidity and resistance to damage, while the “tall-boy” rubber surround with integral gasket supports extreme stroke with linearity and durability. Dual 8” spiders are mirror-imaged, to keep the 2” of excursion completely linear and provide cancellation of distortion due to compliance asymmetry, for ultra-low mechanical distortion even at the outer limits of travel.


Put your home’s construction to the test with the phenomenal bass output of this 18” beast!


Car audio recommended alignments:
• Sealed 3 cubic ft. (net internal, not including driver) for an f3 of 28 Hz with a Qtc of .8
• Vented 4 cubic ft. (net internal, not including driver or vent ) tuned to 22 Hz, with 2 flared vents 4" diameter by 32" long, for an f3 of 24 Hz

Home theater/stereo recommended alignments:
• Sealed (home theater/music): 4 cubic ft. (net internal, not including driver) for an f3 of 27 Hz, f10 of 18 Hz with a Qtc of 0.7
• Sealed (music): 7 cubic ft. (net internal, not including driver) for an f3 of 26 Hz, f10 of 15.8 Hz with a Qtc of 0.76
• Vented (home theater): 8 cubic ft. (net internal, not including driver or vent) tuned to 20 Hz, with 3 flared vents 4" diameter by 28.5" long, for an f3 of 18 Hz
• Vented (infra-sub): 12 cubic ft. (net internal, not including driver or vent) tuned to 15.5, with 3 flared vents 4" diameter by 32" long, for an f3 of 15 Hz
• Infinite Baffle: Approved (reaction force cancellation recommended)

Note: All specifications are derived with voice coils wired in series.


Check out this UM18-22 review!

audioXpress Review - February 2017



• 18" design for enormous air movement
• Over 2" of total cone travel!
• 1000 watts RMS power handling
• Dual mirror-imaged linear spiders ensure distortion-free excursion
• Dual 2 ohm, 2-layer copper voice coils
• Large vented pole piece and under-spider venting

Speaker Series Ultimax Series
Model Number UM18-22
Color Black
Unit of Measure Each
UPC 848791001062
Warranty - Parts 5 Years
Warranty - Labor 5 Years
Product Shipping Weight (lbs.) 44.3000
Speaker Type Subwoofer
Nominal Diameter 18"
Power Handling (RMS) 1,000 watts
Power Handling (max) 2,000 watts
Continuous Program Power --
Impedance 4 ohms
Sensitivity 88.6 dB @ 2.83V/1m
Frequency Response 19 - 500 Hz
Voice Coil Diameter 75 mm
Magnet Weight --
DC Resistance (Re) 4.4 ohms
Voice Coil Inductance (Le) 2.22 mH @ 1 kHz
Resonant Frequency (Fs) 19.5 Hz
Mechanical Q (Qms) 3.82
Electromagnetic Q (Qes) 0.62
Total Q (Qts) 0.53
Diaphragm Mass Inc. Airload (Mms) 655g
Moving Mass Of Diaphragm (Mmd) --
Mechanical Compliance of Suspension (Cms) 0.1 mm/N
Surface Area Of Cone (Sd) 1,219 cm²
Volume of Displacement (Vd) 2,681.8 cm³
BL Product (BL) 23.8 Tm
Compliance Equivalent Volume (Vas) 212 liters
Maximum Linear Excursion (Xmax) 22 mm
Driver's Mechanical Losses (Rms) --
Cone / Diaphragm Material Nomex Cone
Entry / Exit Diameter --
Surround Material Rubber
Voice Coil Wire Material --
Voice Coil Former --
Basket/Frame Material Cast Aluminum
Magnet Material Ferrite
Overall Outside Diameter 18.5"
Overall Depth 9"
Baffle Cutout Diameter 17"
# Mounting Holes 8
Mounting Hole Diameter --
Bolt Circle Diameter --
Product Weight --
SKU 848791001062
Model # UM18-22
Barcode # 848791001062
Brand Dayton Audio
Shipping Weight 26.2440kg
Shipping Width 0.533m
Shipping Height 0.356m
Shipping Length 0.533m
Shipping Cubic 0.101174000m3

Dayton ultimax 18

By: on 21 October 2015
I purchased this driver about 9 months ago. It is an incredible speaker. I have it in a 10cft box tuned to 15hz. IT NEVER struggles and will shake the walls when asked. I highly recommend it. Give it 2000watts and it will scare you.

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