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Morel Ultimate UW 1258 12" Subwoofer

Brand:| Model: Ultimate UW 1258
And now…the Ultimate 12" subwoofer. Morel applied their years of experience and creative genius to produce a world-beating sub-bass driver. Get a free knock-down subwoofer cabinet for a limited time with the purchase of a Morel Ultimate UW 1258 12" subwoofer.
  • Uniflow™ aluminum diecast chassis
  • High-flux double ferrite magnet system
  • 5.1" Hexatech™ aluminum voice coil with 1-1/2" winding length
  • Very high Xmax for extended bass response
  • One piece paper cone/center dome
  • Accucenter™ self-centering cone assembly
  • PFS™ Progression Field Symmetry spider/surround engineering
Part # 
Weight: 17 lbs.  
List Price$664.99
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Your Price
Buy 4-up$502.30
Knock-Down MDF 1.5 cu. ft. Subwoofer Cabinet for Dayton Audio 12" Reference Series HO Subwoofer
Qty: 1Part # 300-7077
List Price:$129.99
Part # 297-132
Qty:  EA
Available Payment Methods

Product Details

Morel Ultimate UW 1258 12" Subwoofer

And now…the Ultimate 12" subwoofer. Morel applied their years of experience and creative genius to produce a world-beating sub-bass driver. Extra-large diameter 5" voice coil, free-breathing cast frame, and symmetrical suspension system guarantee the ultimate in subwoofer performance.

For a limited time, a 1.5 cubic foot knock-down subwoofer cabinet is included for free. This cabinet creates a critically damped system when used with the Morel Ultimate UW 1258 and 1 lb. of Acousta-Stuf, for a Qtc of 0.766 and an f3 of 39 Hz, for refined sub-bass performance in home theater and critical listening applications.

Cabinet Specifications: • Panel thickness: 3/4", front baffle is 1-1/2" • Panel material: Medium Density Fiberboard (MDF) • Finished net cabinet volume (subtracting the double thick baffle, bracing, and subwoofer volume): 1.25 cubic feet • External dimensions: 15.5" H x 15.5" W x 16.25" D • Subwoofer recess: 1/2" • Weight: 37 lbs. • Made in the U.S.A.

Product Specifications
  • Nominal Diameter12"
  • Power Handling (RMS)800 Watts
  • Power Handling (max)3000 Watts
  • Impedance8 ohms
  • Frequency Response20 to 1,000 Hz
  • Sensitivity87 dB 2.83V/1m
  • Voice Coil Diameter5.1"
Thiele-Small Parameters
  • Resonant Frequency (Fs)21 Hz
  • DC Resistance (Re)6.8 ohms
  • Voice Coil Inductance (Le)1.33 mH
  • Mechanical Q (Qms)1.88
  • Electromagnetic Q (Qes)0.56
  • Total Q (Qts)0.43
  • Compliance Equivalent Volume (Vas)4.89 ft.³
  • Mechanical Compliance of Suspension (Cms)0.44 mm/N
  • BL Product (BL)13.67 Tm
  • Diaphragm Mass Inc. Airload (Mms)105.49g
  • Maximum Linear Excursion (Xmax)12.5 mm
  • Surface Area of Cone (Sd)437 cm²
Materials of Construction
  • Cone MaterialPaper
  • Surround MaterialRubber
  • Voice Coil Wire MaterialAluminum
  • Voice Coil FormerAluminum
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter12.01"
  • Baffle Cutout Diameter10.63"
  • Depth6.07"
  • # Mounting Holes6
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume1.53 ft.³
  • Sealed F342 Hz
  • Vented Volume4.77 ft.³
  • Vented F323 Hz
Morel Ultimate UW 1258 12" Subwoofer
  • BrandMorel
  • ModelUltimate UW 1258
  • Part Number297-132
  • UPC844632070877
  • Product CategorySubwoofer Drivers
  • Unit of MeasureEA
  • Product Rating
    (3 Reviews)
  • Weight17 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

View similar products to the Morel Ultimate UW 1258 12" Subwoofer
in the Subwoofer Drivers product category.


Morel Ultimate UW 1258 12" Subwoofer
Morel Ultimate UW 1258 12" Subwoofer is rated 4.3333 out of 5 by 3.
Rated 3 out of 5 by from the perfect subwoofer with one major flawThis subwoofer is amazing in every shape and form. It's constructed well and generously given a enormous voice coil and can withstand massive power for its size high quality construction beautifully formed but there's one major flaw in my opinion! Given that I have the box that included free with the purchase of the sub, the box that was given, is too small!!!!! they shouldn't even give that box that's stupid. my issue with this speaker is that the spider suspension system is extremely weak causing the speaker to bottom at even less than 500 watts. the speaker will bottom out after 300 watts RMS which makes this speaker extremely weak. no I have not built a box that is compliant which will come in the future but I'm dissatisfied with the performance of the woofer.
Date published: 2015-04-27
Rated 5 out of 5 by from Best SQ sub I've ever heardI purchased this driver and am using it with a 1.5 ft^3 enclosure and 1 LB of daycron fibers. The box was a snap to assemble and finished nicely. The sound quality of this thing is phenomenal. The bass is real and not the slightest bit boomy. I am powering it with a QSC 1450, which will do 900 watts continuous at 8 ohms, which might be a little overkill, but this thing needs lots of power for good head room. I am going to be purchasing an additional woofer, box and amplifier within the next month.When I say best sub I've ever heard; I mean it. It sounds better than anything in Martin Logan's or Paradigm's line up. Very happy, and completely recommend.
Date published: 2015-04-10
Rated 5 out of 5 by from Best subwoofer I have ever heardI bought the UW1258 with the knock-down 1.5 cu ft cabinet and 1 lb of acousta-stuff. Powered it with the Dayton Audio SPA500. The amp leds show that I am getting a bit of clipping at high gain, but not noticeable to the ear. I compared this sealed subwoofer to my ported HSU VTF-3 MK2, using the HSU test CD. I'm happy to say that the Morel sounds fantastic, clearly better than the HSU. Given that the Morel combo is more expensive than the HSU, that should be expected. But, often in life you don't get a better product just because you spend more money. In this instance, I clearly did, and I am very happy with this subwoofer. I would highly recommend it.
Date published: 2015-02-03
  • 2015-05-24T07:44CST
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Product Q&A

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Morel Ultimate UW 1258 12" Subwoofer

What would be suitable plate amp to match this Speaker?

Asked by: HK Long
Any of our 500 or 1000 watt models would work well with this woofer.
Answered by: MattP
Date published: 2014-05-10

Possible sealed and vented enclosure recommendations

What are the recommended enclosure sizes?
Asked by: cavemanmusic
The recommended enclosure for this woofer is sealed at 2 cubic feet. If you wanted to go vented, it would have to be 5.25 cubic feet net with a 4" diameter, 17" long port for a tuning frequency of 18 Hz.
Answered by: MattP
Date published: 2014-05-10
  • 2015-05-24T08:43CST
  • bvseo_cps, prod_bvqa, vn_cps_3.1.3
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_2
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  • clientName_PartsExpressInternational

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