IMPERO 18A 18" Professional Series Speaker

High power driver recommended for pro audio in vented enclosures. Suited for full-range three-way boxes, bass guitar boxes, and small subwoofers.

SPECIFICATION
Nominal Basket Diameter	18", 457 mm
Nominal Impedance*	8 Ω
Power Rating*
Program Power	2400 W
Watts	1200 W
Resonance	33 Hz
Usable Frequency Range	39 Hz - 0.8 kHz
Sensitivity*	95.9 dB
Magnet Weight	109 oz.
Gap Height	0.5", 12.7 mm
Voice Coil Diameter	4", 102 mm
THIELE & SMALL PARAMETERS
Resonant Frequency (fs)	33 Hz
DC Resistance (Re)	5.41 Ω
Coil Inductance (Le)	1.47m H
Mechanical Q (Qms)	14.02
Electromagnetic Q (Qes)	0.44
Total Q (Qts)	0.43
Compliance Equivalent Volume (Vas)	317.02 liters / 11.2 cu.ft.
Peak Diaphragm Displacement Volume (Vd)	927.2 cc
Mechanical Compliance of Suspension (Cms)	0.17 mm/N
BL Product (BL)	18.9 T-M
Diaphragm Mass Inc. Airload (MMs)	140 grams
Efficiency Bandwidth Product (EBP)	75
Maximum Linear Excursion (Xmax)	8 mm
Surface Area of Cone (Sd)	1159 cm2
Maximum Mechanical Limit (Xlim)	20.2 mm
MOUNTING INFORMATION
Recommended Enclosure Volume
Sealed	N/a
Vented	113.27-277.51 liters / 4-9.8 cu.ft.
Driver Volume Displaced	0.237 cu.ft. / 6.7 liters
Overall Diameter	18", 457.2 mm
Baffle Hole Diameter	16.56", 420.6 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	8.31", 211.1 mm
Net Weight	27.3 lbs, 12.38 kg
Shipping Weight	30.8 lbs, 13.97 kgs
MATERIALS OF CONSTRUCTION
Coil Construction	Copper voice coil
Coil Former	Fiberglass former
Magnet Composition	Ferrite magnet
Core Details	Bumped Vented Extended core

Basket Materials	Die-cast aluminum basket
Cone Composition	Water resistant paper cone
Cone Edge Composition	Treated cloth cone edge
Dust Cap Composition	Water resistant treated paper dust cap