Description

DELTA PRO Series 400W

Recommended for professional audio in both sealed and vented enclosures. Ideal for full-range, mid/hi, and
monitor wedges.
SPECIFICATION

• Nominal Basket Diameter 18″, 457 mm
• Nominal Impedance 4 ohms
• Power Rating Watts 500 W / Music Program 1000 W
• Resonance 28 Hz
• Usable Frequency Range 37 Hz – 250 Hz
• Sensitivity 96
• Magnet Weight 67 oz.
• Gap Height 0.38″, 9.53 mm
• Voice Coil Diameter 2.5″, 63.5 mm

THIELE & Small Parameters

• Resonant Frequency (fs) 28 Hz
• DC Resistance (Re) 5.3
• Coil Inductance (Le) 3.43 mH
• Mechanical Q (Qms) 10.38
• Electromagnetic Q (Qes) 0.33
• Total Q (Qts) 0.32
• Compliance Equivalent Volume (Vas) 493.19 liters / 17.41 cu. ft.
• Peak Diaphragm Displacement Volume (Vd) 796.00 cc
• Mechanical Compliance of Suspension (Cms) 0.25 mm/N
• BL Product (BL) 18.9 T-M
• Diaphragm Mass inc. Airload (Mms) 128.1 grams
• Efficiency Bandwidth Product (EBP) 84
• Maximum Linear Excursion (Xmax) 6.7 mm
• Surface Area of Cone (Sd) 1188.0 cm²
• Maximum Mechanical Limit (Xlim) 15.0 mm

MOUNTING Information

• Recommended Enclosure Volume
  Sealed N/A
  Vented 85-297 liters/3.0-10.5 cu. ft.
• Overall Diameter 18.00″, 457.20 mm
• Baffle Hole Diameter 16.57″, 420.88 mm
• Front Sealing Gasket fitted as standard
• Rear Sealing Gasket fitted as standard
• Mounting Holes Diameter 0.28″, 7.11 mm
• Mounting Holes B.C.D. 17.25″, 438.15 mm
• Depth 8.13″, 206.50 mm

MATERIALS of Construction

• Copper voice coil
• Polyimide former
• Ferrite magnet
• Vented and extended core
• Die-cast aluminum basket
• Paper Cone
• Cloth cone edge
• Solid composition paper dust cap
• (PLEASE CONTACT OUR OFFICE RE SHIPPING)