EarthQuake EQ8S8 User Manual

Specification
Nominal Basket Diameter
Nominal Impedance
Power Rating
Resonance
Usable Frequency Range
Sensitivity
Magnet Weight
Voice Coil Diameter
8-3/16", 209mm
8-Ohms
80 Watts
395Hz
395Hz - 5kHz
96.3 dB
42.2 oz.
1.5" 38.6mm
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)
395Hz ±15%
6.5 Ohms
367.888m mH
3.896
1.662
1.165
.75 liters / .0624 cu.ft.
11.806mm/N
11.557 T-M
12.001 grams
1.6 mm
211.241 cm
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 3/16", 209mm
7 1/8", 181mm
fitted as standard
fitted as standard
2-15/16", 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 EQ8S8 Pro Audio Series
4-5.5 x 10mm
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
30
40
50
60
70
80
90
100
110
Ohm
6
7
8
9
10
20
30
40
50

EarthQuake EQ8S8 Specifications

General

Type	Subwoofer
Driver/Woofer Size	8 inches
Impedance	Dual 4 Ohm
Basket Material	Stamped Steel
Surround Material	Foam

Summary

Speaker Specifications

Nominal Basket Diameter

Specifies the nominal diameter of the speaker basket, measuring 8-3/16 inches or 209mm.

Nominal Impedance

Indicates the nominal electrical impedance of the speaker, rated at 8 Ohms.

Power Rating

Defines the continuous power handling capacity of the speaker, rated at 80 Watts.

Resonance Frequency

States the fundamental resonant frequency (fo) of the speaker, which is 395Hz.

Thiele & Small Parameters

Resonant Frequency (fo)

The primary resonant frequency of the speaker system, with a tolerance of ±15%.

DC Resistance (Re)

The DC resistance of the voice coil, measured at 6.5 Ohms.

Coil Inductance (Le)

The inductance of the voice coil, specified as 367.888 mH.

Mechanical Q (Qms)

The mechanical quality factor of the speaker system, rated at 3.896.

Electromagnetic Q (Qes)

The electrical quality factor of the speaker system, rated at 1.662.

Total Q (Qts)

Compliance Equivalent Volume (Vas)

Mechanical Compliance of Suspension (Cms)

BL Product (BL)

Diaphragm Mass (Mmd)

Maximum Linear Excursion (Xmax)