ALPHA 4-8 4" ( 2 Each ) American Standard Series Speaker

Ideally suited for line arrays, car doors, side panels, and other tight-fitting applications, the Alpha 4 is a versatile 110-watt driver that can be used full range, midbass, or as a midrange. They can be stacked in a column for vocal applications or with a tweeter and a sub for compact, high-performance PA or MI applications. Applications  Midbass | Midrange Line Array | Pro Audio | Car Audio | Bookshelf Speakers | Satellite System Box Type: Sealed | Vented Specifications Download Spec Sheet     Download Cab Design SPECIFICATION Nominal Basket Diameter 4", 102 mm Nominal Impedance* 8 Ω Power Rating* Program Power 110 W Watts 55 W Resonance 123 Hz Usable Frequency Range 105 Hz - 12 kHz Sensitivity* 88 dB Magnet Weight 10 oz. Gap Height 0.144", 3.7 mm Voice Coil Diameter 1", 25 mm THIELE & SMALL PARAMETERS Resonant Frequency (fs) 123 Hz DC Resistance (Re) 6.73 Ω Coil Inductance (Le) 0.28m H Mechanical Q (Qms) 6.83 Electromagnetic Q (Qes) 0.84 Total Q (Qts) 0.75 Compliance Equivalent Volume (Vas) 1.94 liters / 0.07 cu.ft. Peak Diaphragm Displacement Volume (Vd) 15 cc Mechanical Compliance of Suspension (Cms) 0.42 mm/N BL Product (BL) 4.94 T-M Diaphragm Mass Inc. Airload (MMs) 4 grams Efficiency Bandwidth Product (EBP) 146 Maximum Linear Excursion (Xmax) 2.6 mm Surface Area of Cone (Sd) 57.7 cm2 Maximum Mechanical Limit (Xlim) 4.5 mm MOUNTING INFORMATION Recommended Enclosure Volume Sealed 1.87-8.5 liters / 0.07-0.3 cu.ft. Vented 2.27-4.25 liters / 0.08-0.15 cu.ft. Driver Volume Displaced 0.012 cu.ft. / 0.33 liters Overall Diameter 4.57", 116.1 mm Baffle Hole Diameter 3.77", 95.8 mm Front Sealing Gasket Yes Rear Sealing Gasket Yes Mounting Holes Diameter 0.15", 3.8mm Mounting Holes B.C.D. 4.25", 108mm Depth 2.31", 58.7 mm Net Weight 1.5 lbs, 0.68 kg Shipping Weight 3.3 lbs, 1.5 kgs MATERIALS OF CONSTRUCTION Coil Construction Copper voice coil Coil Former Polyimide former Magnet Composition Ferrite magnet Core Details Non-Vented core     Basket Materials Pressed steel basket Cone Composition Paper cone Cone Edge Composition Cloth cone edge Dust Cap Composition Solid composition paper dust cap Frequency Response