ARMOR 12'' Dual 4 Ohm Voice Coil Subwoofer・ Color Chrome-Treated Poly Injection Cone・ 2400 Watts. Subwoofer Basics:. Subwoofer Size: 12''. Subwoofer Type: Stand Alone. Total Power Output: 2400 Watts. RMS Power: 1200 Watts 4 Ohms. Frequency Response: 28 Hz to 1500 KHz. Voice Coil and Cone:. Voice Coil Size: 2. Voice Coil Structure: Dual. Voice Coil Material: Kapton. Cone Material: Color Chrome Treated Poly Injection. Electro-Mechanical:. Free Air Resonance (FS): 28 Hz. Surround Material: Butyl Rubber. Box Type: Sealed Recommended. Enclosure:. Mounting Depth: 518''. Port Frequency: Small = 40 Hz; Large = 33 Hz. Ported Enclosure: Small = 1 CuFt; Large = 1.6 CuFt. Sealed Enclosure: Small = 1 CuFt; Large = 2.5 CuFt. Port Diameter: Small = 4 ''; Large = 4 ''. Port Length: Small = 18 ''; Large = 16 ''.