820H 8" Lead / Rhythm Guitar Speaker - Hemp

4 ohm hemp cone speaker with rich, warm, full-bodied tone with fat, punchy lows, smooth, but defined highs, and a nice break up. Prominent mids, but with a warm, smooth texture. Characteristics    Series Patriots Model 820H Application 8" Open or Closed Back Configuration 1, 2, or 4 X 8" Low End Response Aggressive Low End Shape Fat Mid-Range Response Moderate Mid-Range Shape Warm High-End Response Moderate Volume/Power Loudest Overall Coloration* A rich, warm, full bodied tone that emulates a larger cone, with  fat, punchy lows, smooth, but defined highs, and a nice break up.  The mids are prominent, but with a warm, smooth texture. Break-up Modes Medium Power Range Up to 20 watts Instrument* Lead/Rhythm Guitar, Harmonica Genre of Music* Jazz, Rock, Country, and Blues Specifications Download Spec Sheet SPECIFICATION Nominal Basket Diameter 8", 203 mm Nominal Impedance* 4 Ω Power Rating* Program Power 40 W Watts 20 W Resonance 144 Hz Usable Frequency Range 80 Hz - 4.6 kHz Sensitivity* 96.1 dB Magnet Weight 15 oz. Gap Height 0.25", 6.4 mm Voice Coil Diameter 1", 25 mm THIELE & SMALL PARAMETERS Resonant Frequency (fs) 144 Hz DC Resistance (Re) 3.64 Ω Coil Inductance (Le) 0.33m H Mechanical Q (Qms) 18.78 Electromagnetic Q (Qes) 0.92 Total Q (Qts) 0.88 Compliance Equivalent Volume (Vas) 9.62 liters / 0.34 cu.ft. Peak Diaphragm Displacement Volume (Vd) 36.7 cc Mechanical Compliance of Suspension (Cms) 0.13 mm/N BL Product (BL) 5.74 T-M Diaphragm Mass Inc. Airload (MMs) 9 grams Efficiency Bandwidth Product (EBP) 156 Maximum Linear Excursion (Xmax) 1.59 mm Surface Area of Cone (Sd) 230.9 cm2 Maximum Mechanical Limit (Xlim) N/A MOUNTING INFORMATION Recommended Enclosure Volume Sealed Acceptable Vented Acceptable Driver Volume Displaced 0.018 cu.ft. / 0.51 liters Overall Diameter 8.24", 209.3 mm Baffle Hole Diameter 7.13", 181.1 mm Front Sealing Gasket Yes Rear Sealing Gasket N/A Mounting Holes Diameter 0.22", 5.6mm Mounting Holes B.C.D. 7.75", 196.9mm Depth 3.06", 77.7 mm Net Weight 3.1 lbs, 1.41 kg Shipping Weight 3.9 lbs, 1.77 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 Hemp paper cone Cone Edge Composition Full paper cone Dust Cap Composition Zurette dust cap Frequency Response