2) Kicker C104 10" 300W Comp 4-Ohm Car Audio Subwoofers Subs C10 Pair | 43C104 KICKER 43C104 Comp 10" 300 Watt SVC 4-ohm Car Audio Subwoofer. Size: 10 inches (25.0 cm). Impedance: 4 ohms SVC Max Rec Amplifier Power:* ....300 Watts Peak ....150 Watts RMS Sensitivity: 86.2 dB 1w/1m Frequency Response: 30-500 Hz. Mounting Depth: 5-1/16 inches (12.8 cm). Mounting Cutout: 9-1/8 inches (23.1 cm) Min Sealed Box Vol: 1.0 cu. ft (28.3 L). Max Sealed Box Vol: 2.4 cu. ft (68 L) Min Vented Box Vol: 1.25 cu. ft (35.4 L). Max Vented Box Vol: 1.75 cu. ft (49.6 L)