Check the listing for details. Eminence Beta-10CBMRA 10" inch Closed Sealed Back 8 ohm 400 W PA Speaker 2-PACK. Condition: New. Listed at 269.98 USD. Eminence Beta-10CBMRA Eminence’s American Standard series professional audio loudspeakers offers exceptional value with performance, and the Beta 10CBMRA is no exception. With its economical stamped steel, closed-back chassis, the Beta 10CBMRA offers versatility by eliminating the need for separate sub-enclosures. A usable frequency range of 300Hz to 4kHz combined with 200 watts continuous power handling makes the Beta 10CBMRA a perfect midrange driver for high-power pro audio cabinets, or high-power/high SPL car stereo applications. Product Specifications Nominal Basket Diameter 10″, 254mmNominal Impedance* 8 ohmsPower Rating: Watts 200W, Music Program 400WResonance 326.38HzUsable Frequency Range 300Hz – 4kHzSensitivity 99.6dBMagnet Weight 34 oz.Gap Height 0.31″, 7.95mmVoice Coil Diameter 2″, 50.8mm Thiele & Small Parameters Resonant Frequency (fs) 326.38HzDC Resistance (Re) 5.68Coil Inductance (Le) 0.48mHMechanical Q (Qms) 7.14Electromagnetic Q (Qes) 2.27Total Q (Qts) 1.73Compliance Equivalent Volume (Vas) 1.7 liters / 0.06 cu.ft.Peak Diaphragm Displacement Volume (Vd) 52.52ccMechanical Compliance of Suspension (Cms) 0.01mm/NBL Product (BL) 9.5 T-MDiaphragm Mass Inc. Airload (MMs) 17.62 gramsEfficiency Bandwidth Product (EBP) 143.4Maximum Linear Excursion (Xmax) 1.5mmSurface Area of Cone (Sd) 350.1 cm2Maximum Mechanical Limit (Xlim) 3mm Mounting Information Recommended Enclosure Volume – Closed Back Driver, Not ApplicableDriver Volume Displaced 69.1 cu.in. / 1.1 litersOverall Diameter 10.09″, 256.29mmBaffle Hole Diameter 9.18″, 233.17mmFront Sealing Gasket Fitted as standardRear Sealing Gasket Fitted as standardMounting Holes Diameter 0.25″, 6.35mmMounting Holes B.C.D. 9.66″, 245.36mmDepth 3.56″, 90.42mmNet Weight 7.3 lbs, 3.31 kgShipping Weight 8.3 lbs, 3.76 kgs Materials of Construction Coil Construction Aluminum voice coilCoil Former Polyimide formerMagnet Composition Ferrite magnetCore Details Non-Vented coreBasket Materials Pressed steel basketCone Composition Paper ConeCone Edge Composition Cloth cone edgeDust Cap Composition Solid composition paper dust cap