Specification
Nominal Basket Diameter
Nominal Impedance
Max Power Rating
Resonance
Usable Frequency Range
Sensitivity
12-1/4”, 310 mm
8-Ohms
400 Watts
Sound That Will Move You.
51 Hz
35 Hz- 4.5 kHz
96.5 dB (2.83V/1M)
60 oz.
Magnet Weight
Voice Coil Diameter
2-1/2”, 63 mm
Thiele & Small Parameters
Resonant Frequency (Fs)
DC resistance (Re)
Coil Inductance at Fs (Lces)
Mechanical Q (Qms)
51 Hz
5.2 Ohms
38.37 mH
8.95
Electromagnetic Q (Qes)
Total Q (Qts)
Compliance Equivalent Volume (Vas)
0.42
0.41
0.20 ft3, 91.6 liters
Mechanical Compliance of Suspension (Cms)
BL Product (BL)
Diaphragm Mass (Mmd)
Maximum Linear Excursion (Xmax)
Surface Area of Cone (Sd)
0.23 mm/N
12.84 T-m
35.2 grams
4.0mm
Earthquake EQ128 Pro Audio Series
0.0531 m2
Mounting Information
Recommended Enclosure Volume
Sealed
Vented
Overall Diameter
1.0-2.1 ft3, 28.3-59.5 liters
12-1/4”, 310 mm
Cut Out Diameter
11-3/16”, 284 mm
Front Sealing Gasket
Rear Sealing Gasket
Mounting Holes Diameter
Mounting Depth
fitted as standard
fitted as standard
1/4” x 3/8” , 6.5 mm x 9 mm
4-7/8”, 123 mm
Materials of Construction
Aluminum voice coil
Polyimide former
Ferrite magnet
Vented and extended core
Stamped steel basket
Paper cone
Cloth surround
Solid composition paper dust cap
Earthquake Sound Corporation
2727 McCone Avenue • Hayward, CA 94545 • United States
US Toll Free 1-800-576-7944 • Tel: 510-732-1000 • fax: 510-732-1095
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