Just set it in the middle.

 

thanks for all the help. my other sub should be here tomorrow so i think i am just going to install everything and then run it up to a shop and just get them to tune it. that way i know its getting done by someone who atleast knows more than i do about tuning. again thanks for all the help

 

you would be suprised at how very little some installers know about amp tuning, i retuned my friends amp who had his tuned by a "pro" and the filters were all screwed up, gain was like half way and BB was ALL the way up, talk about distorting...