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This bundle contains two Alpine R-W12D4 R-Series 12-Inch Dual 4 Ohm Subwoofers Alpine R-W12D4 12-Inch Dual 4 Ohm Subwoofer Features: High Amplitude Multi-Roll surrounds (HAMR) Parabolic Cone Structure with Pulp/Kevlar Cone & PP/Mica/Talc Dust Cap. Concealed Mount Gasket. Reinforced Cone Neck & Spider Joint. Progressive Spider with Reinforced Layer Tinsel Leads. Integrated 8 AWG Push Terminals with VC Configuration Jumpers. High-Excursion Overhung Voice Coil Configuration. High-Grade Strontium Ferrite Segmented Assembly. 65mm Voice Coil with High Temp 4-Layer DVC Winding on AL former. Airflow Optimized Dual Flare Pole Vent. Cast Aluminum Frame with Integral Shorting Sleeve. Compound Radius Curve Extended Pole Geometry. Airflow Management & Heat Transfer System. Specifications: Size: 12 Inches. Frequency Response: 24Hz-200Hz. Power Range: 500W-750W RMS. Power Handling: 750W RMS / 2250W Peak. Magnet Weight: 127oz. Voice Coil Diameter: 65.5mm / 2.6′. Sensitivity (SPL): 84.7dB. DC Resistance (Re): 3.6 Ohm + 3.6 Ohm. Inductance (Le): 4.46 mH. Free Air Resonance (Fs): 28 Hz. Equivalent Stiffness (Vas): 48 L. Mechanical Q (Qms): 7.15. Electrical Q (Qes): 0.61. Total Q (Qts): 0.56. Cone Area (Sd): 479cm^2. Linear Excursion (Xmax): 20 mm. Mounting Depth: 5-7/8 Inch Mechanical Travel (Xmech): 72 mm. Box Specifications: Sealed Box Net Internal Volume: 0.55-1.0 ft^3 Ported Box Net Internal Volume: 1.0-1.5 ft^3 Ported Box Tuning Range: 32-37 Hz