Wierd Noise In My Subwoofers?

[Futurama_King]

I Got 1 12" Pioneer Subwoofer 1200watts In A Small Closed Box, Normal Size For 1 12". Its Hooked Up To A 1000watt Kenwood Amp. The Problem Is When Im In The Trunk My Subwoofer Sounds Like It Has Paper In It Or On It, Like Rattling Or Shaking Paper. When I Put My Hand Close To The Subwoofer It Feels Like Air Is Being Pushed Out Of The Front Threw The Who Whoofer. Is This Causing The Sound? Should There Be A Port Hole In The Box? Whould That Stop This? The Subwoofer Is Fairly New.