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EarthQuake EQ128 User Manual

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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: 510-732-1000 • fax: 510-732-1095
www.earthquakesound.com
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EarthQuake EQ128 Specifications

General IconGeneral
Driver Size12 Inches
Power Handling Peak800 Watts
Frequency Response20Hz - 1600Hz
Voice Coil2.5 inch
Cutout Diameter11.125 Inches (283 mm)
Overall Diameter12.5 Inches (318 mm)

Summary

Speaker Specifications

Nominal Basket Diameter

12-1/4 inches (310 mm) for the speaker basket.

Nominal Impedance

The speaker's nominal electrical impedance is 8 Ohms.

Max Power Rating

The maximum continuous power handling capacity is 400 Watts.

Resonance

The resonant frequency (Fs) of the speaker is 51 Hz.

Usable Frequency Range

The speaker operates effectively from 35 Hz to 4.5 kHz.

Sensitivity

Sensitivity is 96.5 dB SPL at 1 meter with 2.83V input.

Magnet Weight

The speaker utilizes a magnet weighing 60 oz.

Voice Coil Diameter

The voice coil has a diameter of 2-1/2 inches (63 mm).

Thiele & Small Parameters

Resonant Frequency

Fs (Resonant Frequency) is 51 Hz.

DC Resistance

Re (DC resistance) is 5.2 Ohms.

Coil Inductance

Lces (Coil Inductance at Fs) is 38.37 mH.

Mechanical Q

Qms (Mechanical Q) is 8.95.

Electromagnetic Q

Qes (Electromagnetic Q) is 0.42.

Total Q

Qts (Total Q) is 0.41.

Equivalent Volume

Vas (Compliance Equivalent Volume) is 0.20 ft³ / 91.6 liters.

Mechanical Compliance

Cms (Mechanical Compliance of Suspension) is 0.23 mm/N.

BL Product

BL (BL Product) is 12.84 T-m.

Diaphragm Mass

Mmd (Diaphragm Mass) is 35.2 grams.

Maximum Linear Excursion

Xmax (Maximum Linear Excursion) is 4.0mm.

Surface Area of Cone

Sd (Surface Area of Cone) is 0.0531 m².

Mounting Information

Recommended Enclosure Volume

Optimal volume for sealed (1.0-2.1 ft³) and vented (28.3-59.5 liters) enclosures.

Overall Diameter

The external diameter of the speaker is 12-1/4" (310 mm).

Cut Out Diameter

The required cut-out diameter for mounting is 11-3/16" (284 mm).

Gasket Information

Includes front and rear sealing gaskets fitted as standard.

Mounting Holes

Mounting holes are 1/4" x 3/8" (6.5 mm x 9 mm).

Mounting Depth

The depth required for mounting is 4-7/8" (123 mm).

Materials of Construction

Voice Coil Material

Features an aluminum voice coil for durability and performance.

Former Material

Utilizes a polyimide former for heat resistance.

Magnet Type

Constructed with a ferrite magnet for strong magnetic field.

Basket Construction

Features a vented and extended core with a stamped steel basket.

Cone and Surround

Made with a paper cone and cloth surround for optimal acoustic response.

Dust Cap

Includes a solid composition paper dust cap.

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