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NEW Dayton Audio UMII18-22 Ultimax II 18" DVC Subwoofer 2 Ohm Per Coil

Dayton Audio
Part #295-718

NEW Dayton Audio UMII18-22 Ultimax II 18" DVC Subwoofer 2 Ohm Per Coil

Dayton Audio
Part #295-718  
Model: UMII18-22
Introducing the UMII18-22 Ultimax II 18" Carbon Fiber Cone subwoofer from Dayton Audio - the next evolution of low frequency excellence. Building upon the legendary reputation of its predecessor, this subwoofer has what it takes to deliver an exceptional listening experience. With improved excursion capability, lower distortion, higher power handling, better efficiency, and increased output, this driver was purposefully engineered to provide mind-blowing bass that will leave you breathless. Discover unparalleled bass immersion with the UMII18-22 subwoofer, delivering precision and power for those in pursuit of the ultimate sound.
Key Features
  • A large aluminum shorting cap and sleeve help keep inductance linear to guarantee minimal distortion
  • The rigid yet lightweight woven carbon fiber cone delivers quick, detailed, and accurate response
  • With ±28 mm xmax, you can expect powerful and deep bass response, taking your audio experience to the next level
  • Equipped with a 4-layer 3" flat wound voice coil that can handle a staggering 1,200 watts RMS, you can expand the boundaries of audio excellence
  • The frame and motor include extensive venting ensuring efficient heat dissipation for consistent and reliable operation, while minimizing power compression
  • Dual spiders maintain cone linearity even at extremely high excursion levels, providing peak audio performance at all times
  • Optimized for compact sealed enclosures, but capable of exceptional low frequency extension in vented designs - offering you the freedom to create the perfect audio setup
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Overview

Dayton Audio UMII18-22 Ultimax II 18" DVC Subwoofer 2 Ohm Per Coil

Dayton Audio UMII18-22 18" Ultimax II DVC Subwoofer

Introducing the Dayton Audio UMII18-22 Ultimax II 18" carbon fiber cone subwoofer driver - a true powerhouse, engineered to deliver more of everything you loved about the original Ultimax drivers. This cutting-edge subwoofer is the product of advanced technology, meticulous design, and a relentless pursuit of low frequency bliss. Drawing upon the success of its predecessor, the UMII18-22 subwoofer packs an arsenal of enhancements to deliver mind-blowing bass that will leave you breathless. With improved excursion capability, lower distortion levels, higher power handling, greater efficiency, and increased output, this subwoofer is a force to be reckoned with. Whether you're a home theater enthusiast, a car audio aficionado, or a devout audiophile, the Ultimax II is the obvious choice to satisfy your craving for earth-shaking sound.

Key Specs:

  • Nominal Diameter: 18"
  • Power Handling (RMS): 1,200W
  • Power Handling (MAX): 2,400W
  • Impedance: 2Ω + 2Ω (Dual voice coils)
  • Frequency Response: 20- 500Hz
  • Sensitivity: 90.7 dB 2.83V/1m
  • Voice Coil Diameter: 3"
  • Maximum Linear Excursion: ±28 mm

Download Spec Sheet

Built for Extension, Output, and Versatility

Like you have come to expect from the original Ultimax drivers, the UMII18-22 plays clean, low, fast, and LOUD. Featuring 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, this driver is built for high SPL, ultra-low bass extension and minimal distortion.

Thanks to the 3" diameter flat wound voice coil and thorough venting, this driver can withstand up to 1,200 watts of power continuously without power compression or 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.

When it comes to enclosure flexibility, the UMII18-22 is truly exceptional. This subwoofer has been specifically designed to deliver output that falls below the limits of human hearing from sealed enclosures as small as 4 cubic feet. However, its capabilities do not end there. In larger vented designs, the UMII18-22 goes above and beyond, producing incredible sound pressure levels down to 20 Hz or even lower. In summary, whether you're using it in a compact enclosure or a larger vented setup, the UMII18-22 is your path to pure bass bliss.

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 1,200 watts RMS, the UMII18-22 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 UMII18-22 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 UMII18-22 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): 4 cubic ft. (net internal, not including driver volume) produces an f3 of 34 Hz with a 0.8 Qtc alignment
  • Vented: 6 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

UMII15-22 15"

Nominal Diameter: 15"
Frequency Response: 20-500Hz

Shop 15"

UMII12-22 12"

Nominal Diameter: 12"
Frequency Response: 22-1,000Hz

    Shop 12"

    UMII10-22 10"

    Nominal Diameter: 10"
    Frequency Response: 25-1,000Hz

      Shop 10"

      UMII8-22 8"

      Nominal Diameter: 8"
      Frequency Response: 30-1000Hz

        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 UMII18-22 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

        BrandDayton Audio
        ModelUMII18-22
        Part Number295-718
        UPC848791010255
        Unit of MeasureEach
        Weight47.6

        Product Specifications

        Nominal Diameter18"
        Bolt Circle Diameter17.6
        Power Handling (RMS)1200 Watts
        Power Handling (MAX)2400 Watts
        Impedance4Ω
        Frequency Response20 to 500Hz
        Sensitivity90.7dB 2.83V/1m
        Voice Coil Diameter3"

        Thiele-Small Parameters

        Resonant Frequency (Fs)22Hz
        DC Resistance (Re)4.2Ω
        Voice Coil Inductance (Le)1.15mH
        Mechanical Q (Qms)2.53
        Electromagnetic Q (Qes)0.67
        Total Q (Qts)0.53
        Compliance Equivalent Volume (Vas)8.77ft³
        Mechanical Compliance of Suspension (Cms)0.124mm/N
        BL Product (BL)19.2T·m
        Diaphragm Mass Inc. Airload (Mms)420g
        Maximum Linear Excursion (Xmax)28mm
        Surface Area of Cone (Sd)1184cm²

        Materials of Construction

        Cone MaterialCarbon Fiber
        Surround MaterialRubber
        Voice Coil Wire MaterialCopper
        Voice Coil FormerAluminum
        Basket / Frame MaterialCast Aluminum
        Magnet MaterialFerrite

        Mounting Information

        Overall Outside Diameter18.5"
        Baffle Cutout Diameter16.80"
        Depth8.6"
        # Mounting Holes8

        Parts Express Staff Recommended Enclosure Volume

        Sealed Volume4ft³
        Sealed F335Hz
        Vented Volume6ft³
        Vented F324Hz

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