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 12″, 304.8 mm
• Nominal Impedance 8 ohms
• Power Rating Watts 400 W / Music Program 800 W
• Resonance 51 Hz
• Usable Frequency Range 52 Hz – 4.5 kHz
• Sensitivity 99.2
• Magnet Weight 80 oz.
• Gap Height 0.375″, 9.53 mm
• Voice Coil Diameter 2.5″, 63.5 mm

THIELE & Small Parameters

• Resonant Frequency (fs) 51 Hz
• DC Resistance (Re) 5.71
• Mechanical Q (Qms) 7.56
• Electromagnetic Q (Qes) 0.37
• Total Q (Qts) 0.35
• Compliance Equivalent Volume (Vas) 81.7 liters, 2.9 cu.ft.
• Peak Diaphragm Displacement Volume 242 cc
• Mechanical Compliance of Suspension (Cms) 0.21 mm/N
• BL Product (BL) 15.3 T-M
• Diaphragm Mass inc. Airload (Mms) 48 grams
• Efficiency Bandwidth Product (EBP) 138
• Maximum Linear Excursion (Xmax) 4.6 mm
• Surface Area of Cone (Sd) 532.4 cm2
• Maximum Mechanical Limit (Xlim) 13.7 mm

MOUNTING Information

• Recommended Enclosure Volume
  Sealed 28-35 liters/1-1.25 cu.ft.
  Vented 31-91 liters/1.1-3.2 cu.ft.
• Overall Diameter 12.38″, 314.5 mm
• Baffle Hole Diameter 11.07″, 281 mm
• Front Sealing Gasket fitted as standard
• Rear Sealing Gasket fitted as standard
• Mounting Holes Diameter 0.27″, 6.9 mm
• Mounting Holes B.C.D. 11.57″, 293.8 mm
• Depth 6.22″, 158 mm

MATERIALS of Construction

• Aluminum 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)