Specification
Nominal Basket Diameter
Nominal Impedance
Power Rating
8-1/4", 209.5mm
8-Ohms
80 Watts
Sound That Will Move You
Resonance
86.6Hz
Usable Frequency Range
Sensitivity
Magnet Weight
86.6Hz - 10kHz
94.1 dB
42.2 oz.
Voice Coil Diameter
2", 50.8mm
Thiele & Small Parameters
Resonant Frequency (Fo)
DC resistance (Re)
Coil Inductance (Le)
Mechanical Q (Qms)
Electromagnetic Q (Qes)
Total Q (Qts)
86.6Hz ±15%
7.2 Ohms
463.207m mH
8.067
0.454
0.429
Compliance Equivalent Volume (Vas) 11.696 Ltr / 0.41 cu.ft.
Mechanical Compliance of Suspension (Cms) 175.843m mm/N
Earthquake EQ88 Pro Audio Series
BL Product (BL)
12.884 T-M
17.399 grams
3.2 mm
dBSPL
Ohm
100
90
80
70
60
50
40
30
20
200
Diaphragm Mass (Mmd)
Maximum Linear Excursion (Xmax)
Surface Area of Cone (Sd)
216.424 sqM
100
90
Mounting Information
80
70
60
Recommended Enclosure Volume
Sealed
Vented
Overall Diameter
Cut Out Diameter
Front Sealing Gasket
Rear Sealing Gasket
Mounting Holes Diameter
Depth
liters/ ft3
liters/ ft3
50
40
8-1/4", 209.5mm
7 1/16", 180mm
fitted as standard
fitted as standard
8-5 x 9mm
30
20
3-4/8", 88mm
10
9
Materials of Construction
8
7
20K
Copper voice coil
Polyimide former
Ferrite magnet
20 Hz
50
100
200
500
1K
2K
5K
10K
SPL vs Freq
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 • phone: 800-576-7944
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