DELTA PRO-18A
SPECIFICATION
Nominal Basket Diameter	18'', 457mm
Nominal Impedance*	8 lub 4 ohms
Power Rating
Watts	500W
Music Program	1000W
Resonance	28Hz
Usable Frequency Range	37Hz-250Hz
Sensitivity***	96
Magnet Weight	67 oz.
Gap Height	0.380'', 9.53mm
Voice Coil Diameter	2.5'', 63.5mm
THIELE & SMALL PARAMETERS
Resonant Frequency (fs)	28Hz
DC Resistance (Re)	5.3
Coil Inductance (Le)	3.43mH
Mechanical Q (Qms)	10.38
Electromagnetic Q (Qes)	0.33
Total Q (Qts)	0.32
Compliance Equivalent Volume (Vas)	493.2 liters / 17.41cu.ft.
Peak Diaphragm Displacement Volume (Vd)	796cc
Mechanical Compliance of Suspension (Cms)	0.25mm/N
BL Product (BL)	18.9 T-M
Diaphram Mass inc. Airload (Mms)	128 grams
Efficiency Bandwidth Product (EBP)	84
Maximum Linear Excursion (Xmax)	6.7mm
Surface Area of Cone (Sd)	1188.0 cm2
Maximum Mechanical Limit (Xlim)	15.0mm
MOUNTING INFORMATION
Recommended Enclosure
Sealed	N/A
Vented	85-297 liters/3.0-10.5 cu.ft.
Overall Diameter	18.00'', 457.2mm
Baffle Hole Diameter	16.57'', 420.9mm
Front Sealing Gasket	Fitted as standard
Rear Sealing Gasket	Fitted as standard
Mounting Holes Diameter	0.28'', 7.1mm
Mounting Holes B.C. D.	17.25'', 438.2mm
Depth	8.13'', 207mm
Net Weight	17.0 lbs, 7.7 kg
Shipping Weight	20.5 lbs, 9.3 kg
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
Dustcap Composition	Solid composition paper dust cap

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