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NEW Dayton Audio UMII8-22 Ultimax II 8" DVC Subwoofer 2 Ohm Per Coil

Dayton Audio
Part #295-708

NEW Dayton Audio UMII8-22 Ultimax II 8" DVC Subwoofer 2 Ohm Per Coil

Dayton Audio
Part #295-708  
Model: UMII8-22
Introducing the UMII8-22 Ultimax II 8" Carbon Fiber Cone subwoofer from Dayton Audio. Building on the success of their predecessor, these subwoofers have been meticulously engineered to surpass expectations. With improved excursion capability, lower distortion, higher power handling, better efficiency, and increased output, the Ultimax II subwoofers elevate your audio experience to new depths. Immerse yourself in rich, booming bass that will shake you to the core. Dayton Audio continues to redefine the boundaries of excellence with the UMII8-22 subwoofer.
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 ±18 mm xmax, you can expect powerful and deep bass response, taking your audio experience to the next level
  • Equipped with a 4-layer 2-1/2" flat wound voice coil that can handle up to 400 watts RMS
  • 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 UMII8-22 Ultimax II 8" DVC Subwoofer 2 Ohm Per Coil

Dayton Audio UMII8-22 8" Ultimax II DVC Subwoofer

Introducing the Dayton Audio UMII8-22 Ultimax II 8" carbon fiber cone subwoofer - a compact powerhouse for all your bass needs when space is at a premium. 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 UMII8-22 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 stereo 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.

Now you never have to sacrifice bass when you don't have much space - embrace the power, precision, and impact offered by the Dayton Audio UMII8-22. 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 UMII8-22 Ultimax II, the subwoofer that sets the new standard for bass performance when space is at a premium.

Key Specs:

  • Nominal Diameter: 8"
  • Power Handling (RMS): 400W
  • Power Handling (MAX): 800W
  • Impedance: 2Ω + 2Ω (Dual voice coils)
  • Frequency Response: 30- 600 Hz
  • Sensitivity: 84.1 dB 2.83V/1m
  • Voice Coil Diameter: 2-1/2"
  • Maximum Linear Excursion: ±18 mm

UMII8-22 Spec Sheet

Built for Extension, Output, and Versatility

Like you have come to expect from the original Ultimax drivers, the UMII8-22 delivers nothing short of exceptional performance. This small 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, 2-1/2" flat wound voice coil, dual shorting rings, extensive venting, and an FEA optimized motor, the UMII10-22 is specially engineered for high SPL, ultra-low bass extension, and minimal distortion. This means you can expect an incredible amount of clean and accurate low frequency output from this compact driver.

Thanks to its superior design incorporating a 2-1/2" diameter flat wound voice coil and extensive venting, this driver can handle up to a staggering 400 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 UMII18-22. This subwoofer is engineered to perform excellently in sealed enclosures as small as 0.5 cubic feet, providing output that can reach into the bottom octaves. But that's not all. If you want to go with a vented design, rest assured that the UMII8-22 will deliver an F3 under 30 Hz from enclosures as small as 1 cubic foot.

In summary, whether you're looking for a compact setup or a high output vented system, the UMII8-22 is designed to deliver. With its unbeatable features, exceptional power handling, and unparalleled performance, this subwoofer is a stepping stone on the path to audio excellence. Choose the UMII8-22 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.

2-1/2" Flat Wound Voice Coil

In order to reliably handle up to 400 watts RMS, the UMII8-22 is driven by a 2-1/2" 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 UMII8-22 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 UMII8-22 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 (Car audio sound quality/music): 0.5 cubic ft. (net internal, not including driver volume) produces an f3 of 51 Hz with a 0.82 Qtc alignment
  • Vented (Car audio high output/home theater): 1 cubic ft. (net internal, not including driver or port volume) tuned to 25 Hz produces an f3 of 23 Hz

Explore All of the Ultimax II Drivers

UMII18-22 18"

Nominal Diameter: 18"
Frequency Response: 20-500Hz

Shop 18"

UMII15-22 15"

Nominal Diameter: 15"
Frequency Response: 20-300Hz

    Shop 15"

    UMII12-22 12"

    Nominal Diameter: 12"
    Frequency Response: 22-400Hz

      Shop 12"

      UMII10-22 10"

      Nominal Diameter: 10"
      Frequency Response: 25-500Hz

        Shop 10"

        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 UMII8-22 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
        ModelUMII8-22
        Part Number295-708
        UPC848791010217
        Unit of MeasureEach
        Weight14.9

        Product Specifications

        Nominal Diameter8"
        Bolt Circle Diameter7.875
        Power Handling (RMS)400 Watts
        Power Handling (MAX)800 Watts
        Impedance4Ω
        Frequency Response30 - 600Hz
        Sensitivity84.1dB 2.83V/1m
        Voice Coil Diameter2.5"

        Thiele-Small Parameters

        Resonant Frequency (Fs)46Hz
        DC Resistance (Re)3.9Ω
        Voice Coil Inductance (Le)0.75mH
        Mechanical Q (Qms)3.1
        Electromagnetic Q (Qes)0.99
        Total Q (Qts)0.75
        Compliance Equivalent Volume (Vas)0.297ft³
        Mechanical Compliance of Suspension (Cms)0.148mm/N
        BL Product (BL)9.7T·m
        Diaphragm Mass Inc. Airload (Mms)82g
        Maximum Linear Excursion (Xmax)18mm
        Surface Area of Cone (Sd)200cm²

        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 Diameter8.43"
        Baffle Cutout Diameter7.25"
        Depth5.7"
        # Mounting Holes8

        Parts Express Staff Recommended Enclosure Volume

        Sealed Volume0.5ft³
        Sealed F351Hz
        Vented Volume1ft³
        Vented F323Hz

        Specifications

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