Eminence Definimax 4012ULF8 12 Inch Replacement Speaker 1200 Watts

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Product Description

A high-power, ultra-low frequency enhanced version of the popular Definimax 4012LF. Eminence designed it to be perfect for horn loading, or in small to medium-sized vented subwoofers for lots of clean punch and deep lows.

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Helpful Info about the Manufacturer
Phone:  502-845-5622 Warranty:  Warranty: 7 years

Product Specifications

Eminence Definimax 4012ULF-8 - 12" Replacement Speaker Specifications
  • Nominal Basket Diameter: 12 inches (305 mm)
  • Nominal Impedance: 8 ohms
  • Power Rating Watts: 1200 W
  • Power Rating Music Program: 2400 W
  • Resonance: 40 Hz
  • Usable Frequency Range: 37 Hz - 0.2 kHz
  • Sensitivity: 90.7 dB
  • Magnet Weight: 109 oz.
  • Gap Height: 0.375 inch (9.5 mm)
  • Voice Coil Diameter: 4 inch (102 mm)
  • Resonant Frequency (fs): 38 Hz
  • DC Resistance (Re): 6.2 ohms
  • Coil Inductance (Le): 4.42m H
  • Mechanical Q (Qms): 12.13
  • Electromagnetic Q (Qes): 0.32
  • Total Q (Qts): 0.31
  • Compliance Equivalent Volume (Vas): 41.3 liters (1.46 cubic ft.)
  • Peak Diaphragm Displacement Volume (Vd): 365.4 cc
  • Mechanical Compliance of Suspension (Cms): 0.1 mm/N
  • BL Product (BL): 27.38 T-M
  • Diaphragm Mass Inc. Airload (MMs): 153 grams
  • Efficiency Bandwidth Product (EBP): 126
  • Maximum Linear Excursion (Xmax): 6.7 mm
  • Surface Area of Cone (Sd): 545.4 cm2
  • Maximum Mechanical Limit: (Xlim) 15.5 mm
  • Coil Construction: Copper voice coil
  • Coil Former: Kapton former
  • Magnet Composition: Ferrite magnet
  • Core Details: Undercut with aluminum shorting ring and Core Periphery Ventilation
  • Basket Materials: Die-cast aluminum basket
  • Cone Composition: Water resistant paper cone
  • Cone Edge Composition: Cloth cone edge
  • Dust Cap Composition: Water resistant treated paper dust cap

Customer Reviews

Review: Dj papitin Submitted: 8/30/2019

Product Rating5 out of 5 stars.


It work perfect
Product Rating

Product Review

That subwoofer give you the sound you need and the one they handle

Review: Steve carlisle bassist, Submitted: 6/3/2019

Product Rating5 out of 5 stars.


Dont be afraid to take chances

Product Review

I baught two peavey headliner one twelve bass cabinets and a peavey minimega amp.. Thousand watts....wanted a compact bass rig. but a powerfull rig as well...realized the stalk speakers in the two cabs were not going to cut i called chris at peavey for input...he siad with the speakers you propose to put into the cabs would work..and you will have one heck of a huge wall of sound comeing at you. so i got two of the one twelve eminence definimax speakers droped in...both cabs are turbo charged and can handel hard slaping... drop tuneing anything you can throw at them at excessive volums with minimal speaker excursion...could not of done it with out american musical supply thanks for the great gear
AMS Responds:

Review: DJ Marvell Submitted: 8/26/2018

Product Rating5 out of 5 stars.



As good as I expected it handled my 1000 watt rms amp with ease.

Product Review

I don't know what people expect from a 12" sub but it is a supreme item. I play it at 94% max only it is a good setting for my 1000 watt amp, it has a great sound and lots of punch for a speaker this size. I Have two of them and I am not disappointed in their performance. Excellent!


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