Eminence ALPHA-12A User Manual

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Page 1

Specication

Nominal Basket Diameter Nominal Impedance*

Power Rating** Watts Music Program Resonance Usable Frequency Range*** Sensitivity Magnet Weight

Gap Height Voice Coil Diameter

Thiele & Small Parameters

Resonant Frequency (fs)

DC Resistance (Re)

Coil Inductance (Le) Mechanical Q (Qms) Electromagnetic Q (Qes) Total Q (Qts) Compliance Equivalent Volume (Vas)

Peak Diaphragm Displacement Volume (Vd)

Mechanical Compliance of Suspension (Cms)

BL Product (BL) Diaphragm Mass inc. Airload (Mms) Efciency Bandwidth Product (EBP) Maximum Linear Excursion (Xmax)

Surface Area of Cone (Sd)

Maximum Mechanical Limit (Xlim)

12”, 304.8mm

8 ohms

150W 300W

49Hz

51Hz-4.3kHz

95.6

20 oz

0.25”, 6.35mm

1.5”, 38.1mm

49Hz

6.3

0.79mH

6.53

0.88

0.77

121.5 ltr/4.3 cu. ft. 125cc

0.32mm/N

8.5 T-M

33 grams

2.4mm

519.5cm

6.6mm

The Art and Science of Sound

ALPHA-12A American Standard Series

Recommended for professional audio mid-bass applications in a small sealed or medium vented enclosure.

Mounting Information

Recommended Enclosure Volume Sealed Vented

Overall Diameter Bafe Hole Diameter

Front Sealing Gasket Rear Sealing Gasket

Mounting Holes Diameter Mounting Holes B.C.D. Depth Net Weight

Shipping Weight

Materials of Construction

Coil Construction Coil Magnet Composition

Core Details Basket Materials

Cone Composition Cone Edge Composition

Dust Cap Composition

17-22.7 ltr/0.6-0.8 cu. ft.

56.6-113.3 ltr/2-4 cu. ft.

12.26”, 311.4mm

11”, 279.5mm

Fitted as Standard Fitted as Standard

0.25”, 6.4mm

11.71”, 297.5mm

4.73”, 120mm

5.3 lbs, 2.4 kg

7.4 lbs, 3.4 kg

Copper

Polyimide

Ferrite

Vented And Extended

Pressed Steel

Paper

Cloth

Solid Composition Felt

Please inquire about alternative impedances.

Multiple units exceed published rating evaluated under EIA 426A noise source and test standard while in a free-air, nontemperature-controlled environment.

The average output across the usable frequency range when applying 1W/1m into the nominal impedance. Ie: 2.83 V/8 ohms, 4 V/16 ohms.

***

Eminence response curves are measured under the following conditions: All speakers are tested at 1W/1m using a variety of test set-ups for the appropriate impedance | LMS using 0.25” supplied microphone (software

calibrated) mounted 1m from wall/bafe | 2 ft. X 2 ft. bafe is built into the wall with the speaker mounted ush against a steel ring for minimum diffraction | Haer P1500 Trans-Nova amplier | 2700 cu.ft. chamber with

berglass on all six surfaces (three with custom-made wedges)