ALPHA-12A * Nominal Basket Diameter: 12-in 305 mm.* Nominal Impedance: 8 Ohms.* Power Rating:* Watts: 150 W.* Music Program: 300 W.* Resonance: 49 Hz.* Usable Frequency Range: 51 Hz - 4.3 kHz.* Sensitivity: 95.6 dB.* Magnet Weight: 20 oz..* Gap Height: 0.25-in 6.4 mm.* Voice Coil Diameter: 1.5-in 38 mm.* Thiele & Small Parameters.* Resonant Frequency (fs): 49 Hz.* DC Resistance (Re): 6.3 Ohms.* Coil Inductance (Le): 0.79m H.* 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.-----------------------------------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-in 311.4 mm.* Baffle Hole Diameter: 11.06-in 280.9 mm.* Front Sealing Gasket: Yes.* Rear Sealing Gasket: Yes.* Mounting Holes Diameter: 0.25-in 6.4mm.* Mounting Holes B.C.D.: 11.71-in 297.4mm.* Depth: 4.73-in 120.1 mm.* Net Weight: 5.3 lbs 2.4 kg.* Shipping Weight: 7.4 lbs 3.36 kgs.* Materials of Construction.* Coil Construction: Copper voice coil.* Coil Former: Polyimide former.* Magnet Composition: Ferrite magnet.* Core Details: Vented & 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.

ALPHA-12A * Nominal Basket Diameter: 12-in 305 mm.* Nominal Impedance: 8 Ohms.* Power Rating:* Watts: 150 W.* Music Program: 300 W.* Resonance: 49 Hz.* Usable Frequency Range: 51 Hz - 4.3 kHz.* Sensitivity: 95.6 dB.* Magnet Weight: 20 oz..* Gap Height: 0.25-in 6.4 mm.* Voice Coil Diameter: 1.5-in 38 mm.* Thiele & Small Parameters.* Resonant Frequency (fs): 49 Hz.* DC Resistance (Re): 6.3 Ohms.* Coil Inductance (Le): 0.79m H.* 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 Displ