The Beta 12CX is a coaxial speaker to which a Compression Driver must be attached. Eminence recommends the PSD2002S-8 Compression Driver and the PXB2:1K6 2-way Crossover with this product (not included). Ideal for full-range, near field and monitoring applications.Materials of Construction:Kapton coil former for increased rigidity and thermal protectionPolyamide-imide coated two-layer, 30ga., copper Voice Coil for improved power handling and durability.Ferrite MagnetExtended core for increased power handlingPremium pressed steel basket for maximum strengthPaper coneCloth cone edgeScreened cloth dust capAluminum hornSpecifications:Nominal Basket Diameter: 12"", 304.8mmImpedance: 8 OhmsPower Rating: 250WrmsResonance: 43HzUsable Frequency Range: 45Hz - 20kHzMagnet Weight: 38oz.Gap Height: 0.312"", 7.94mmVoice Coil Diameter: 2"", 50.8mmMounting Information:Recommended Enclosure Volume (vented):48 - 79 liters1.7 - 2.8 cu. ft.Overall Diameter: 12.02"", 305.2mmBaffle Hole Diameter: 10.97"", 278.6mmFront Sealing Gasket: fitted as standardRear Sealing Gasket: fitted as standardMounting Holes Diameter: 0.25"", 6.4mmMounting Holes B.C.D.: 11.63"", 295.3mmDepth: 4.47"", 113.5mmShipping Weight: 9.5lbs., 4.3 kg.