Dual 2 ohm voice coils allow for stereo 2 ohm and mono 1 ohm wiring configurations when connecting to high current car audio and professional audio amplifiers to extract maximum power. For home audio applications, simply wire the voice coils in series for a benign 4 ohm load for greater amplifier compatibility.
To improve power handling, increase thermal management, and reduce power compression, Dayton Audio designed the Ultimax Series with large black anodized formers and vented pole pieces, under-spider ventilation, and two-layer copper voice coils.
Over 1-1/2" of travel (3/4" Xmax) is kept completely linear through the use of dual spiders that also limit distortion and rocking modes. "Tall-boy" rubber surrounds with integrated gaskets maintain driver surface area during extreme excursion moments. Thick, one-piece Nomex honeycomb covered cones are covered with woven, heavy-duty glass fibers creating ultra-still cones that resist deformation.
A large copper sleeve and copper pole cap in the motor reduce energy storage from inductance, with the side benefit of lowering distortion for "faster" response. Large dual-stacked, high-energy magnets handle the heavy lifting and bring Qts down to a level where Ultimax subwoofers can be used in vented or sealed cabinets and enclosures.
• Sealed 3.1 cubic ft. (net internal) with 3 lbs. of Acousta-Stuf polyfill, f3 of 35 Hz with a 0.707 Qtc alignment
• Vented 6.0 cubic ft. (net internal, not including driver or port volume) with 6 lbs. of Acousta-Stuf tuned to 18 Hz with two 4" diameter by 26" long flared ports for an f3 of 22 Hz. Larger cabinets and lower tuning frequencies are possible.
Note: All parameters derived with voice coils wired in series.
|Speaker Series||Ultimax Series|
|Unit of Measure||Each|
|Warranty - Parts||5 Years|
|Warranty - Labor||5 Years|
|Product Shipping Weight (lbs.)||28.0000|
|Power Handling (RMS)||800 watts|
|Power Handling (max)||1,600 watts|
|Continuous Program Power||--|
|Sensitivity||86.5 dB @ 2.83V/1m|
|Frequency Response||15 - 1,000 Hz|
|Voice Coil Diameter||63.5 mm|
|DC Resistance (Re)||3.4 ohms|
|Voice Coil Inductance (Le)||1.31 mH|
|Resonant Frequency (Fs)||19.5 Hz|
|Mechanical Q (Qms)||2.40|
|Electromagnetic Q (Qes)||0.59|
|Total Q (Qts)||0.47|
|Diaphragm Mass Inc. Airload (Mms)||279.4 g|
|Moving Mass Of Diaphragm (Mmd)||--|
|Mechanical Compliance of Suspension (Cms)||0.24 mm/N|
|Surface Area Of Cone (Sd)||814.6 cm²|
|Volume of Displacement (Vd)||1,548 cm³|
|BL Product (BL)||--|
|Compliance Equivalent Volume (Vas)||224.3 liters|
|Maximum Linear Excursion (Xmax)||19 mm|
|Driver's Mechanical Losses (Rms)||--|
|Cone / Diaphragm Material||Nomex Cone|
|Entry / Exit Diameter||--|
|Voice Coil Wire Material||Copper|
|Voice Coil Former||Aluminum|
|Dual Voice Coil||Yes|
|Basket/Frame Material||Cast Aluminum|
|Overall Outside Diameter||388 mm|
|Overall Depth||226 mm|
|Baffle Cutout Diameter||350 mm|
|# Mounting Holes||8|
|Mounting Hole Diameter||--|
|Bolt Circle Diameter||--|