Long throw subwoofer for very small
vented boxes. Over-sized top plate
and large pole vent help keep the coil
cool.
SPECIFICATION :
Nominal Basket Diameter 18" , 457 mm
Nominal Impedance* 8 ©
Power Rating* *
Watts 500 W
Music Program 1000 W
Resonance 28 Hz
Usable Frequency Range 37 Hz - 0.2 kHz
Sensitivity* * * 96 dB
Magnet Weight 67 oz.
Gap Height 0.38" , 9.7 mm
Voice Coil Diameter 2.5" , 64 mm
EMINENCE DELTA PRO 18A
THIELE & SMALL PARAMETERS :
Resonant Frequency ( fs) 28 Hz
DC Resistance ( Re) 5.3 ©
Coil Inductance ( Le) 3.43m H
Mechanical Q ( Qms) 10.38
Electromagnetic Q ( Qes) 0.33
Total Q ( Qts) 0.32
Compliance Equivalent Volume ( Vas) 493.2 liters / 17.42 cu.ft.
Peak Diaphragm Displacement Volume ( Vd) 796 cc
Mechanical Compliance of Suspension ( Cms) 0.25 mm/ N
BL Product ( BL) 18.9 T-M
Diaphragm Mass Inc. Airload ( MMs) 128 grams
Efficiency Bandwidth Product ( EBP) 84
Maximum Linear Excursion ( Xmax) 6.7 mm
Surface Area of Cone ( Sd) 1188 cm2
Maximum Mechanical Limit ( Xlim) 15. mm
MOUNTING INFORMATION :
Recommended Enclosure Volume
Sealed N/ a
Vented 85-297 liters / 3-10.5 cu.ft.
Driver Volume Displaced 0.212 cu.ft. / 6.01 liters
Overall Diameter 18" , 457.2 mm
Baffle Hole Diameter 16.57" , 420.9 mm
Front Sealing Gasket Yes
Rear Sealing Gasket Yes
Mounting Holes Diameter 0.28" , 7.1mm
Mounting Holes B.C.D. 17.25" , 438.2mm
Depth 8.13" , 206.5 mm
Net Weight 17 lbs, 7.71 kg
Shipping Weight 20.5 lbs, 9.3 kgs
MATERIALS OF CONSTRUCTION :
Coil Construction Copper voice coil
Coil Former Polyimide former
Magnet Composition Ferrite magnet
Core Details Vented and extended core
Basket Materials Die-cast aluminum basket
Cone Composition Paper cone
Cone Edge Composition Cloth cone edge
Dust Cap Composition Solid composition paper dust cap