Need some help

[gummi bear]

what mids and highs should i use for a single 18" fi? and can you give me a detailed description of the equipment and how much to be purchased...

[Skullz]

2 sets of hertz hsk 165, you can another set if these aren't loud enough and run at 2ohm.

http://www.hertzaudiovideo.com/default_en.htm

4ch amp

http://www.soundsolutionsaudio.com/store/products/Sundown-Audio-SAX%252d100.4.html