EarthQuake EQ128 Specification

Specification

Nominal Basket Diameter
Nominal Impedance
Max Power Rating
Resonance
Usable Frequency Range
Sensitivity
Magnet Weight
Voice Coil Diameter

12-1/4”, 310 mm

8-Ohms

400 Watts

51 Hz

35 Hz- 4.5 kHz

96.5 dB (2.83V/1M)
60 oz.

2-1/2”, 63 mm

Thiele & Small Parameters

Resonant Frequency (Fs)
DC resistance (Re)
Coil Inductance at Fs (Lces)
Mechanical Q (Qms)
Electromagnetic Q (Qes)
Total Q (Qts)
Compliance Equivalent Volume (Vas)
Mechanical Compliance of Suspension (Cms)
BL Product (BL)
Diaphragm Mass (Mmd)
Maximum Linear Excursion (Xmax)
Surface Area of Cone (Sd)

51 Hz

5.2 Ohms

8.95

0.42

0.41

0.23 mm/N

12.84 T-m

35.2 grams

2

0.0531 m

38.37 mH

3

0.20 ft ,

4.0mm

91.6 liters

Mounting Information

Recommended Enclosure Volume
Sealed
Vented
Overall Diameter
Cut Out Diameter
Front Sealing Gasket
Rear Sealing Gasket
Mounting Holes Diameter
Mounting Depth

3

1.0-2.1 ft , 28.3-59.5 liters
12-1/4”, 310 mm

11-3/16”, 284 mm

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 EQ128 Pro Audio Series

Sound That Will Move You.

Earthquake Sound Corporation
2727 McCone Avenue • Hayward, CA 94545 • United States
US Toll Free 1-800-576-7944 • Tel: [phone] • fax: [phone]
www.earthquakesound.com