Specification
Nominal Basket Diameter
Nominal Impedance
Power Rating
Resonance
Usable Frequency Range
Sensitivity
Magnet Weight
Voice Coil Diameter
8-1/4", 209.5mm
8-Ohms
80 Watts
86.6Hz
86.6Hz - 10kHz
94.1 dB
42.2 oz.
2", 50.8mm
Thiele & Small Parameters
Resonant Frequency (Fo)
DC resistance (Re)
Coil Inductance (Le)
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)
86.6Hz ±15%
7.2 Ohms
463.207m mH
8.067
0.454
0.429
11.696 Ltr / 0.41 cu.ft.
175.843
m mm/N
12.884 T-M
17.399 grams
3.2 mm
216.424 sqM
Mounting Information
Recommended Enclosure Volume
Sealed
Vented
Overall Diameter
Cut Out Diameter
Front Sealing Gasket
Rear Sealing Gasket
Mounting Holes Diameter
Depth
liters/ ft3
liters/ ft3
8-1/4", 209.5mm
7 1/16", 180mm
fitted as standard
fitted as standard
3-4/8", 88mm
Materials of Construction
Copper voice coil
Polyimide former
Ferrite magnet
Vented and extended core
Stamped steel basket
Paper cone
Cloth surround
Solid composition paper dust cap
Earthquake
EQ88 Pro Audio Series
8-5 x 9mm
Sound That Will
Move
You
Earthquake Sound Corporation
2727 McCone Avenue • Hayward, CA 94545 • phone: 800-576-7944
fax: 510-732-1095 • www.earthquakesound.com
SPL vs Freq
20 Hz
50
100
200
500
1K
2K
5K
10K
20K
dBSPL
20
30
40
50
60
70
80
90
100
Ohm
7
8
9
10
20
30
40
50
60
70
80
90
100
200
