Comp Subwoofers Model: C10size (inch, Cm): 10, 25.4impedance (ohms): 4 Or 8 Max Rec Amplifier Power (watt Peak/rms): 300/150sensitivity (db 1 Watt/ 1 M): 87.3frequency Response (hz): 30-500mounting Depth (inch, Cm): 4-13/16, 12.3mounting Cut-out Square (inch, Cm): 9-1/4, 23.5min Rec Sealed Box Volume (cu, Ft, Liters): 1.0, 28.3max Rec Sealed Box Volume (cu, Ft, Liters): 2.4, 68min Rec Vented Box Volume (cu, Ft, Liters): 1.25, 35.4max Rec Vented Box Volume (cu, Ft, Liters): 1.75, 49.6model: C12size (inch, Cm): 12, 30.5impedance (ohms): 4 Or 8 Max Rec Amplifier Power (watt Peak/rms): 300/150sensitivity (db 1 Watt/1 M): 89.1frequency Response (hz): 27-500mounting Depth (inch, Cm): 5-13/16, 14.8mounting Cut-out Square (inch, Cm): 11-1/8, 28.3min Rec Sealed Box Volume (cu, Ft, Liters): 1.25, 35.4max Rec Sealed Box Volume (cu, Ft, Liters): 3.5, 99.1min Rec Vented Box Volume (cu, Ft, Liters): 1.75, 49.6max Rec Vented Box Volume (cu, Ft, Liters): 2.25, 63.7 The Comp Subwoofer Represents The Best Balance Between High Value And High Performance Available In Today's Round-subwoofer Market. It's Equipped With All The Proven Kicker Engineering That You Expect, And It's Got A New Look That Leaves The Impression That It Has A Mean Streak. Besides Its Wicked Good Looks, The Comp Comes With Serious Muscle, Including Double Stitching On The Surround, Coil-cooling Perimeter Venting, And Flex-killing Isd (inverted Structural Dome). The Comp Is Versatile Too, Performing In Free-air Applications As Well As In Vented Or Sealed Boxes. If All This Wasn't Enough, The Comp Still Leaves You With Enough Cash Left Over To Throw Down On A Powerful Kicker Amplifier To Pump All The Performance From Your Sub. The Rigid Cone's Back Bracing Completely Eliminates Distortion, Allowing The Best Bass To Be Delivered. The Larger Voice Coils, Coil Wire With Intense Heat Tolerance, Highly Engineered Top Plates, And Immense Power Handling Still Remain, Providing The Most And Best Bass From Any Subwoofe