Eminence Alpha 12 Speaker (150 Watts, 12 in.)

Ideal for two-way sound reinforcement systems, keyboard, guitar combos.

Technical Info

Nominal Basket Diameter- 12 in., 304.8mm

Impedance- 8 ohm

Power Rating- 150W rms

Music Program- 300W

Resonance- 49Hz

Usable Frequency Range- 45Hz - 5kHz

Average Sensitivity- 1W @ 1m 98 dB

Magnet Weight- 20oz.

Gap Height- 0.25", 6.35mm

Voice Coil Diameter- 1.5", 38.1mm

Resonant Frequency- 49Hz

Impedance (RE)- 6.30 ohm

Coil Inductance (Le)- 0.79mH

Electromagnetic Q (Qes)- 0.88

Mechanical Q (Qms)- 6.53

Total Q (Qts)- 0.77

Compliance Equivalent Volume (Vas)- 121.5 liters (4.29 cu.ft.)

Peak Diaphragm Displacement- Volume (Vd) 125cc

Mechanical Compliance of suspension (Cms)- 0.32mm/N

BL Product (BL)- 8.5 T-M

Diaphragm Mass inc. Airload (Mms)- 33 grams

Equiv. Resistance of mechanical suspension loss (Rms)- 1.54N*sec/M

Efficiency Bandwidth Product (EBP)- 56

Voice Coil Overhang (Xmax)- 2.4mm

Surface Area of Cone (Sd)- 519.5cm2

Impedance at Resonance (Zmax)- 53 ohm

Important Note

Watts: The guaranteed long term power rating throughout the usable frequency range of the speaker.

(Translation: the speaker will operate continuously at any frequency within the speakers specified frequency range when driven at this power. The "Watts" rating is similar to RMS, but is really more indicative of long term thermal capability.)

Music Program: The speaker will safely and reliably handle the varying frequencies of musical content at this power rating. The "Music Program" rating is more indicative of what you can expect in the real world with the speaker operating within the appropriate enclosure reproducing music or vocal audio program.