Dayton Audio Ultimax UM8-22
8" (20cm) subwoofer
/piece
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Description
The Ultimax UM8-22 is an 8" (20cm) subwoofer that is part of Dayton Audio's renowned Ultimax series. This impressive model has been designed from the ground up to move air and deliver accurate, yet fast and deep bass. It stands out with its small cabinet optimization and high performance features like a 16mm XMAX, a robust Nomex honeycomb cone, a tall-boy rubber surround for added linear excursion and an impressive RMS power handling of 300 watts. The UM8-22 is your answer to deep, powerful bass in a smaller format.
Highlights
- 8" (20cm) subwoofer
- 16 mm XMAX makes this subwoofer one of the 8-inch subwoofers with the highest excursion on the market
- Thick, one-piece Nomex honeycomb cone with woven high-performance glass fiber
- Tall boy rubber surround for extra-long linear deflection without reducing the cone surface area
- Two sprockets with linear stiffness limit distortion and rocking
- 300 Watt RMS load capacity
- Black anodized aluminium former and black pole improve heat dissipation
- Dual 2-ohm, 2-layer copper voice coils
Product details
- To increase power handling, improve thermal management and reduce power compression, Dayton Audio has equipped the Ultimax series with large, black anodized bobbins and vented pole pieces, ventilation under the spider and dual-layer copper voice coils.
- Over 1-1/4" excursion (.67" Xmax) is kept completely linear through the use of dual spiders, which also limit distortion and rocking modes. "Tall-boy" rubber surrounds with integrated seals maintain the driver surface even at extreme excursions. The thick, one-piece Nomex honeycomb cone is covered with woven, heavy-duty glass fibers, creating an ultra-rigid surface that resists distortion.
- A large copper sleeve and copper pole cap in the motor reduce energy storage through inductance, with the side effect of lowering distortion for a "faster" response. Large, double-stacked high-energy magnets do the heavy lifting, bringing Qts to a level where Ultimax subwoofers can be used in vented or sealed enclosures.
Enclosure recommendations
- Closed 10 liters, f3 of 49 Hz with a QTc of 0.8 Qtc
- Bass reflex 21 liters tuned to 30 Hz with a 25 cm wide and 2.5 cm high slotted port that is 76.2 cm long, resulting in an f3 of 30 Hz
Properties
- Woofer series : Ultimax Series
- Nominal diameter : 8"
- Power handling (RMS) : 300 Watt
- Load capacity (max) : 600 Watt
- Impedance (Z) : 2+2 Ohm
- Sensitivity : 84.2 dB @ 2.83V/1m
- Frequency response : 30 - 800 Hz
- Voice coil diameter : 2"
- DC resistance (Re) : 4.2 Ohm
- Voice coil induction (Le) : 1.14 mH
- Resonant frequency (Fs) : 31.6 Hz
- Mechanical quality (Qms) : 2.51
- Electrical quality (Qes) : 0.75
- Overall quality (Qts) : 0.58
- Movable mass (Mms) : 74.5g
- Compliance of the suspension (Cms) : 0.33 mm/N
- Diaphragm area (Sd) : 211.2 cm²
- Displacement volume (Vd) : 359.1 cm³
- Force factor (BL) : 9.1 Tm
- Equivalent volume (Vas) : 21.30 liters
- Maximum deflection (Xmax) : 16.0 mm
- Membrane material : Nomex
- Bead material : Rubber
- Voice coil wire material : Copper
- Voice coil forming material : Aluminum
- Basket / frame material : Cast aluminum
- Magnet material : Ferrite
- Outer diameter : 21cm
- Total depth : 14,3cm
- Cut-out diameter : 19,7cm
- Mounting holes : 8
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