SUB WOOFER And box etc ?

I dont know much about the technical side of what im selling. All i can tell you is i bought last year off a friend and he fitted it my Astra and made my stereo and music BOOM.The sub woofer was placed in my boot with the box which attaches the leads etc. i had also a K&N filter which i took off as it made my car sound like a sports car i know roughly how it was set up and thats all,i know it was connected to the BASS on the music button. In good order Im giving the filter with the Woofer Selling cheap to fund new car parts The pictures will prob better decribe than what i have thanks