Earthquake Sound Speaker EQ128 User Manual

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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