Dayton Audio UMII15-22 Ultimax II 15" DVC Subwoofer 2 Ohm Per Coil Dayton Audio UMII15-22 15" Ultimax II DVC Subwoofer Introducing the Dayton Audio UMII15-22 Ultimax II 15" carbon fiber cone subwoofer - the ultimate powerhouse for all your bass needs. Built with cutting-edge technology, meticulous design, and a relentless pursuit of perfection, this subwoofer is here to redefine your audio experience. Offering deeper, cleaner, and more detailed bass with unrivaled authority, the UMII15-22 is engineered to bring your music, movies, and games to life like never before. With improved excursion capability, lower distortion, higher power handling capabilities, greater efficiency, and increased output, this subwoofer is an unstoppable force that will leave you breathless. No matter if you're a home theater enthusiast, a car audio aficionado, or a devout audiophile, the Dayton Audio Ultimax II is the obvious choice for those who crave earth-shaking sound. Don't settle for less when it comes to bass - embrace the power, precision, and impact offered by the Dayton Audio UMII15-22. Elevate your audio experience and immerse yourself in a world of deep, thunderous bass that will shake you to your core. Upgrade your system today and feel the full potential of what exceptional subwoofer technology can deliver. The Dayton Audio UMII15-22 Ultimax II, the subwoofer that sets the new standard for bass performance. Key Specs: Nominal Diameter: 15" Power Handling (RMS): 900W Power Handling (MAX): 1,800W Impedance: 2Ω + 2Ω (Dual voice coils) Frequency Response: 20- 300Hz Sensitivity: 88.5 dB 2.83V/1m Voice Coil Diameter: 3" Maximum Linear Excursion: ±24 mm UMII15-22 Spec Sheet Built for Extension, Output, and Versatility Like you have come to expect from the original Ultimax drivers, the UMII15-22 delivers nothing short of exceptional performance. This powerhouse of a driver is built to impress with its deep, clean, fast, and powerful low frequency output. Equipped with a carbon fiber cone, rigid cast aluminum frame, dual spiders, 3" flat wound voice coil, dual shorting rings, extensive venting, and an FEA optimized motor, the UMII15-22 is specially engineered for high SPL, ultra-low bass extension, and minimal distortion. This means you can expect a mind-blowing audio experience without compromising on quality. Thanks to its superior design incorporating a 3" diameter flat wound voice coil and meticulous venting, this driver can handle up to a staggering 900 watts of power continuously, without significant power compression or thermal fatigue. With dual 2-ohm voice coils, you have the freedom to operate in stereo 2-ohm mode or configure it in either 1-ohm or 4-ohm mono mode, giving you maximum flexibility in your setup. Let's talk about enclosure flexibility - a standout feature of the UMII15-22. This subwoofer is engineered to perform excellently even in sealed enclosures as small as 3 cubic feet, providing output that extends beyond the limits of human hearing. But that's not all. If you want to go bigger and bolder with a vented design, rest assured that the UMII15-22 will deliver impressive sound pressure levels, diving down to a remarkable 20 Hz or even lower. Whether you're looking for a compact sealed setup or a substantial vented system, the UMII15-22 is your true companion on the quest for bass nirvana. With its unbeatable features, exceptional power handling, and unparalleled performance, this subwoofer is a stepping stone on the path to audio excellence. Choose the UMII15-22 from Ultimax and elevate your audio experience to new heights. Carbon Fiber Cone and High Roll Rubber Surround With a remarkably high strength to weight ratio, Dayton Audio chose a single layer woven carbon fiber cone for the Ultimax II. This rigid diaphragm resists deformation from the stress of high displacement to ensure pistonic movement and extreme durability. Thanks to the low mass, this driver can reproduce every detail with accuracy and control. More than just a cosmetic touch, the cone is indexed for a smooth transition between the cone and surround adding extra rigidity on the edge to minimize unwanted resonances. Supporting the diaphragm is a high roll butyl rubber surround that has been optimized to allow extreme excursion without sacrificing cone area. 3" Flat Wound Voice Coil In order to reliably handle up to 900 watts RMS, the UMII15-22 is driven by a 3" diameter, 4-layer, flat wound voice coil on a vented aluminum former. The flat ribbon wire has significantly more surface and contact area than round wire resulting in improved heat transfer and dissipation. The 4 layers put more windings in the magnetic gap while keeping the gap as tight as possible, improving motor strength and overall control. Additionally, the thick aluminum former plays a crucial role by efficiently drawing heat away from the voice coil, the first step to keeping the motor cool. Optimized Motor with Extensive Venting In order to ensure optimal performance and minimize distortion, the voice coil is driven by a FEA optimized magnet assembly. This assembly creates a powerful and symmetric magnetic field in the center of the voice coil allowing for identical forward and backward movement of the cone, even at maximum displacement. The top and back plates have been precisely machined with sculpted edges to effectively contain and transfer the magnetic force. To prevent overheating, the motor assembly and frame feature extensive venting, allowing heat to escape from the voice coil and former. This venting is achieved through various paths, including the voice coil former, sub-cone, under the spider, through the pole piece, and voice coil gap, ensuring efficient cooling and preventing power compression, even during long listening sessions. Low Distortion Shorting Cap and Sleeve To keep distortion at a minimum, the UMII15-22 incorporates an aluminum shorting sleeve and a thick aluminum pole piece cap. These elements play a crucial role in maintaining stability and consistency in the motor's magnetic field as the voice coil moves within the magnetic gap. In addition, they ensure that the inductance remains linear throughout the entire stroke of the voice coil. This consistent motor force is instrumental in minimizing non-linearities and intermodulation distortion. Moreover, the shorting rings contribute to a reduction in the overall inductance of the voice coil, thereby enhancing the output capability in the mid-bass and upper bass frequencies. Dual Spiders with Stitched Tinsel Leads Achieving truly linear movement in high excursion drivers is of utmost importance. Even the tiniest rocking motion can be greatly magnified as the cone travels further away from its resting position. In order to avoid this issue, the UMII15-22 driver incorporates a dual spider system. The spiders are intentionally spaced as far apart as possible to ensure that the cone and voice coil move reliably in a pistonic manner. Furthermore, in order to prevent fatigue and breakage the tinsel leads have been meticulously stitched onto the top spider. This not only enhances the overall durability but also eliminates any possibility of contact between the leads and the cone or spider. Enclosure Recommendations Sealed (home theater/music): 3 cubic ft. (net internal, not including driver volume) produces an f3 of 36 Hz with a 0.83 Qtc alignment Vented: 5 cubic ft. (net internal, not including driver or port volume) produces an f3 of 24 Hz. Larger cabinets and lower tuning frequencies are possible. Explore All of the Ultimax II Drivers UMII18-22 18" Nominal Diameter: 18" Frequency Response: 20-500Hz Shop 18" UMII12-22 12" Nominal Diameter: 12" Frequency Response: 22-400Hz Shop 12" UMII10-22 10" Nominal Diameter: 10" Frequency Response: 25-500Hz Shop 10" UMII8-22 8" Nominal Diameter: 8" Frequency Response: 30-600Hz Shop 8" Additional Resources We pride ourselves on being an authority in the speaker building and DIY community. With over 60 years of combined engineering experience, our team of engineers is here to help with your build. Below are some useful tools to get you started. Learn More At The Resource Center Note: The Ultimax II UMII15-22 is a dual voice coil driver with a 2-ohm impedance per coil. All parameters are measured with the voice coil wires in series, resulting in a single 4-ohm load. Product Details Brand Dayton Audio Model UMII15-22 Part Number 295-714 UPC 848791010248 Unit of Measure Each Weight 34.85 Product Specifications Nominal Diameter 15" Bolt Circle Diameter 14.6 Power Handling (RMS) 900 Watts Power Handling (MAX) 1800 Watts Impedance 4Ω Frequency Response 20 - 300Hz Sensitivity 88.5dB 2.83V/1m Voice Coil Diameter 3" Thiele-Small Parameters Resonant Frequency (Fs) 29Hz DC Resistance (Re) 4.2Ω Voice Coil Inductance (Le) 0.7mH Mechanical Q (Qms) 2.34 Electromagnetic Q (Qes) 1 Total Q (Qts) 0.7 Compliance Equivalent Volume (Vas) 3.39ft³ Mechanical Compliance of Suspension (Cms) 0.11mm/N BL Product (BL) 14.6T·m Diaphragm Mass Inc. Airload (Mms) 279g Maximum Linear Excursion (Xmax) 24mm Surface Area of Cone (Sd) 791cm² Materials of Construction Cone Material Carbon 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 15.32" Baffle Cutout Diameter 13.9" Depth 8.125" # Mounting Holes 8 Parts Express Staff Recommended Enclosure Volume Sealed Volume 3ft³ Sealed F3 36Hz Vented Volume 5ft³ Vented F3 24Hz Specifications Q&A Reviews Manuals & Resources Manuals & Resources Dayton Audio UMII15-22 Specification Sheet (PDF File) Dayton Audio UMII15-22 Graphs/FRD/ZMA Data File (ZIP File) Dayton Audio UMII15-22 3D Files (ZIP File) Dayton Audio Manufacturer Warranty (PDF File)
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