144Hz

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. SPECIFICATIONNominal Basket Diameter8", 203 mmNominal Impedance*4 ΩPower Rating*Program Power40 WWatts20 WResonance144 HzUsable Frequency Range80 Hz - 4.6 kHzSensitivity*96.1 dBMagnet Weight15 oz.Gap Height0.25", 6.4 mmVoice Coil Diameter1", 25 mmTHIELE & SMALL PARAMETERSResonant Frequency (fs)144 HzDC Resistance (Re)3.64 ΩCoil Inductance (Le)0.33m HMechanical Q (Qms)18.78Electromagnetic Q (Qes)0.92Total Q (Qts)0.88Compliance Equivalent Volume (Vas)9.62 liters / 0.34 cu.ft.Peak Diaphragm Displacement Volume (Vd)36.7 ccMechanical Compliance of Suspension (Cms)0.13 mm/NBL Product (BL)5.74 T-MDiaphragm Mass Inc. Airload (MMs)9 gramsEfficiency Bandwidth Product (EBP)156Maximum Linear Excursion (Xmax)1.59 mmSurface Area of Cone (Sd)230.9 cm2Maximum Mechanical Limit (Xlim)N/AMOUNTING INFORMATIONRecommended Enclosure VolumeSealedAcceptableVentedAcceptableDriver Volume Displaced0.018 cu.ft. / 0.51 litersOverall Diameter8.24", 209.3 mmBaffle Hole Diameter7.13", 181.1 mmFront Sealing GasketYesRear Sealing GasketN/AMounting Holes Diameter0.22", 5.6mmMounting Holes B.C.D.7.75", 196.9mmDepth3.06", 77.7 mmNet Weight3.1 lbs, 1.41 kgShipping Weight3.9 lbs, 1.77 kgsMATERIALS OF CONSTRUCTIONCoil ConstructionCopper voice coilCoil FormerPolyimide formerMagnet CompositionFerrite magnetCore DetailsNon-vented core Basket MaterialsPressed steel basketCone CompositionHemp paper coneCone Edge CompositionFull paper coneDust Cap CompositionZurette dust cap