Nominal Basket Diameter 15" 380mm
Nominal Impedance 8 ohm
Nominal Power Handing (AES) 500W
Continuous Power Handing 1000W
Resonance 42HZ
Usable Frequency Range 42HZ-2.5KHZ
Sensitivity 97 dB
Magnet Weight 126 oz
Voice coil (TIL) 4" 99.2mm
THIELE&SMALL PARAMETERS 
Resonant Frequency fs 42HZ
DC Resistance Re 5.2 ohm
Mechanical Q Qms 9.51
Electromagnetic Q Qes 0.32
Total Q Qts 0.31
Compliance Equivalent Volume VAS 139.58 Ltr
Mechanical Compliance of Suspension (Cms) 0.14mm/N
BL Product BL 21  T-M
Diaphragm Mass Inc.Airload Mms 102 grams
MOUNTING INFORMATION 
Overall Diameter 394mm
Baffle Hole Diameter 354mm
Mounting Holes Diameter 7mm
Mounting Holes P.C.D 373mm
Depth 176mm
Net Weight 11.3kg
Shipping Weight 12.8 kg
Packing Size: 420x420x425mm (2PCS)
20”/740pcs  40”/1540pcs  40”H/1810pcs