Mounting Information Recommended Enclosure Volume Volume Displaced by Driver Overall Diameter Baffle Hole Diameter Front Sealing Gasket Rear Sealing Gasket Mounting Holes Diameter Mounting Holes B.C.D. Depth Shipping Weight
Thiele-Small Parameters Resonant Frequency (fs) Impedance (Re) Coil Inductance (Le) Electromagnetic Q (Qes) Mechanical Q (Qms) Total Q (Qts) Compliance Equivalent Volume (Vas) Peak Diaphragm Displacement Volume (Vd) Mechanical Compliance of Suspension (Cms) BL Product (BL) Diaphragm Mass inc. Airload (Mms) Equiv. Resistance of Mechanical Suspension Loss (Rms) Efficiency Bandwidth Product (EBP) Voice Coil Overhang (Xmax) Surface Area of Cone (Sd) Impedance at Resonance (Zmax) Maximum Mechanical Limit (Xmech) X10
15", 381mm 8 ohms 650Wrms 33Hz 35Hz - 1.5kHz click here for guide 109oz., 3.1 kg. 0.375", 9.5mm 4", 101.6mm
56 - 112 liters 2 - 4 cu. ft. 4.5 liters, 0.159 cu. ft. 15.21", 386.4mm 14.0", 355.5mm fitted as standard fitted as standard 0.275", 7mm 14.56", 369.9mm 6.42", 163mm 26lbs., 11.8kg.
33Hz 6.3 ohms 1.28mH 0.28 7.48 0.27 241 liters 8.51 cu. ft. 411cc 0.2343mm/N 21.28 T-M 98.1 grams 2.7354N*sec/M 116.6 4.8mm 856cm2 175 ohms 28.58mm 6.6mm**
Eminence response curves are measured under the following controlled test conditions:
To download spec sheets: Magnum 18 LF
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 power-handling
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 dust cap for enhanced cooling and protection
**For some transducers, the traditional method of specifying the limit of linear cone excursion as the amount of voice coil overhang is very conservative. In such cases, a measure of cone excursion based on the distortion produced can provide more information about how to best utilize a speaker. To this end, X10 is a measure of the one-way cone excursion that causes the speaker's output sound pressure to contain 10% total harmonic distortion. This measurement is taken at the speaker's resonant frequency in free air.
