Eminence Alpha-12A 12-inch American Standard Series Speaker

SPECIFICATION

• Nominal Basket Diameter: 12", 305 mm
• Nominal Impedance: 8 Ω
• Program Power: 300 W
• Watts: 150 W
• Resonance: 49 Hz
• Usable Frequency Range: 51 Hz - 4.3 kHz
• Sensitivity: 95.6 dB
• Magnet Weight: 20 oz.
• Gap Height: 0.25", 6.4 mm
• Voice Coil Diameter: 1.5", 38 mm

THIELE & SMALL PARAMETERS

• Resonant Frequency (fs): 49 Hz
• DC Resistance (Re): 6.3 Ω
• Coil Inductance (Le): 0.79 mH
• Mechanical Q (Qms): 6.53
• Electromagnetic Q (Qes): 0.88
• Total Q (Qts): 0.77
• Compliance Equivalent Volume (Vas): 121.5 liters / 4.29 cu.ft.
• Peak Diaphragm Displacement Volume (Vd): 125 cc
• Mechanical Compliance of Suspension (Cms): 0.32 mm/N
• BL Product (BL): 8.5 T-M
• Diaphragm Mass Inc. Airload (MMs): 33 grams
• Efficiency Bandwidth Product (EBP): 56
• Maximum Linear Excursion (Xmax): 2.4 mm
• Surface Area of Cone (Sd): 519.5 cm²
• Maximum Mechanical Limit (Xlim): 6.6 mm

MOUNTING INFORMATION

• Recommended Enclosure Volume:
  • Sealed: 17-22.7 liters / 0.6-0.8 cu.ft.
  • Vented: 56.6-113.3 liters / 2-4 cu.ft.
• Driver Volume Displaced: 0.063 cu.ft. / 1.78 liters
• Overall Diameter: 12.26", 311.4 mm
• Baffle Hole Diameter: 11.06", 280.9 mm
• Front Sealing Gasket: Yes
• Rear Sealing Gasket: Yes
• Mounting Holes Diameter: 0.25", 6.4 mm
• Mounting Holes B.C.D.: 11.71", 297.4 mm
• Depth: 4.73", 120.1 mm
• Net Weight: 5.3 lbs, 2.4 kg
• Shipping Weight: 7.4 lbs, 3.36 kg

MATERIALS OF CONSTRUCTION

• Coil Construction: Copper voice coil
• Coil Former: Polyimide former
• Magnet Composition: Ferrite magnet
• Core Details: Vented and extended core
• Basket Materials: Pressed steel basket
• Cone Composition: Paper cone
• Cone Edge Composition: Cloth cone edge
• Dust Cap Composition: Solid composition felt dust cap

Eminence Speaker Footnotes

From dialing a sound in, to rocking it out, Eminence professional audio and musical instrument loudspeakers have been the leading choice in audio applications worldwide since 1966. Eminence is dedicated to providing the best quality, value and service to meet your needs. Nowhere is that mission more evident than in their wide product selection, industry leading seven-year warranty, and unrivaled customer support. Designed and assembled by hand in the USA, Eminence is the most trusted name in the industry. Find out why the world’s premier brands and countless audio enthusiasts and musicians rely on Eminence.

Emininece Speaker Tech Notes

Multiple units exceed published ratings evaluated under EIA 426A specification while tested in a free-air, non-temperature-controlled environment. Multiple compression drivers exceeded published ratings evaluated under EIA-426A or AES specification while mounted on Eminence’s H290, H290S, or H2EA horn in a non-temperature-controlled environment.

Eminence Speaker frequency response curves are an average of multiple units measured while applying 1W/1m into the speakers’ nominal impedance (e.g. 2.83V/8Ω, 4V/16Ω, etc.).  All speakers are measured in a temperature controlled environment using monthly calibrated LMS software with supplied 0.25" microphone mounted on axis 1m distance from baffle.  2 ft. x 2 ft. baffle is flush with anechoic wall and speaker is rear mounted against a thin steel ring for minimum diffraction.  Measurements performed using monthly calibrated Yamaha P3500S amplifier and a 2700 cubic foot anechoic chamber with custom made fiberglass surface treatments.  Measurements below 200Hz are tail corrected to compensate for chamber volume.  Compression drivers measured using a 2ft x 2ft baffle flush with anechoic wall and horn front mounted.