Eminence Magnum 15HO

Nominal Basket Diameter 15", 381mm Impedance 8 ohm Power Rating 750W rms Resonance 33Hz Usable Frequency Range 35Hz - 1.5kHz Average Sensitivity 1W @ 1m 98 dB Magnet Weight 109oz. Gap Height 0.375", 9.5mm Voice Coil Diameter 4", 101.6mm Recommended Enclosure Volume 2-4 cu. ft., 56-112 liters Volume Displaced by Driver .159 cu. ft., 4.5 liters Overall Diameter 15.21", 386.4mm Baffle Hole Diameter 14.0", 355.5mm Front Sealing Gasket fitted as standard Rear Sealing Gasket fitted as standard Mounting Holes Diameter 0.275", 7mm Mounting Hole B.C.D. 14.56", 369.9mm Depth 6.42", 163mm Shipping Weight 26.0 lbs, 11.8 kg


Thiele-Small Parameters Resonant Frequency 33Hz Impedance (RE) 6.3 ohm Coil Inductance (Le) 1.28mH Electromagnetic Q (Qes) 0.28 Mechanical Q (Qms) 7.48 Total Q (Qts) 0.27 Compliance Equivalent Volume (Vas) 241 liters 8.51 cu.ft Peak Diaphragm Displacement Volume (Vd) 411cc Mechanical Compliance of suspension (Cms) 0.2343mm/N BL Product (BL) 21.28 T-M Diaphragm Mass inc. Airload (Mms) 98.1 grams Equiv. Resistance of mechanical suspension loss (Rms) 2.7354N*sec/M Efficiency Bandwidth Product (EBP) 116.6 Voice Coil Overhang (Xmax) 4.8mm Surface Area of Cone (Sd) 856cm2 Impedance at Resonance (Zmax) 175 ohm Maximum Linear Excursion 28.58mm
Materials of Construction Kapton coil former for increased rigidity and thermal protection Polyamide-imide coated one-layer, edgewound copper voice coil for durability, increased sensitivity, and powerhandling Ferrite magnet Die-Cast aluminum basket for rigidity Paper cone/ cloth cone edge with deep sinusoid corrugations for extended travel Copper shorting ring to minimize distortion Aluminum phasor/heatsink to transfer heat from the motor structure and smooth response Screened cloth dust cap for enhanced cooling and protection
The challenge: space vs. bass
Enclosure manufacturers, touring sound engineers, musicians and venue owners are on a constant mission to minimize the amount of space and equipment required to produce maximum sound. Traditionally, the bass transducers have dictated the size and weight of enclosures—and have required designs that are very large. Large speaker cabinets have always plagued venues and presented touring companies with a logistical nightmare. Reducing the size of enclosures can offer significant savings in shipping and labor. In addition to size and weight issues, a compounding problem is that conventional transducers are usually inefficient, requiring large power amplifiers to obtain the desired levels of low-frequency reproduction. This inefficiency often leads to overpowering of the transducer, ultimately resulting in thermal failure. Excessive heat in the motor structure contributes to increased levels of power compression and distortion. Eminence successfully addressed the issue of improving the thermal capacity of large transducers by introducing an innovative voice coil construction, thermally resistant adhesives and coil former materials, core periphery ventilation and a revolutionary heat sink design. The product of these efforts is the respected Eminence Kilomax series, used in some of the most notable enclosure designs today. For issues of power compression, efficiency, enclosure volume and distortion Eminence designers have created the mighty MAGNUM series of transducers.
Big bass, smaller space
MAGNUM features a new cone developed to maximize strength and efficiency. To meet the objective of moving large volumes of air, a brand new sinusoid suspension system (surround and spider) was also created. Both the surround and spider are designed for long excursions and are constructed from an extremely durable poly/cotton material. Eminence devoted considerable attention to improving power compression and distortion. Much research was conducted in creating a more linear flux field. Ultimately, the MAGNUM design team incorporated the use of a copper shorting ring and an undercut pole piece. The copper shorting ring reduces flux modulation created by the energized coil. A more linear flux field provides a more linear output and ultimately lower distortion.
In the process of utilizing the Eminence Kilomax heat sink principle and Core Periphery Ventilation system, Eminence addressed the issue of destructive phase conditions typically apparent in large bass transducers. The result is the aluminum Eminence MAGNUM Phasor. The MAGNUM Phasor works in a similar fashion to those found in much smaller speakers by smoothing the frequency response of the transducer while aiding in the release of thermal energy that would otherwise accumulate in the motor structure. An innovative dust cover prevents foreign material from entering the voice coil gap and subtly displays the precision engineered alloy phasor.
MAGNUM 15HO: Similar characteristics to the MAGNUM 18HO but for use in smaller 2 to 4 cu. ft. enclosures.

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