which sub is better out of these ones..?

which is still a great choice
the alpine plv7

 

is that alpine plv 7 going to work good in the trunk of my car cuz i read some where that its for a hatchback

 

how much does it affect the sub if its in a trunk not a hatchback

and yea thats was my plan a first with those big subs the mofo-12 or 15 and that other one that i listed
but do you know any good amps and subs that work good together and will give me all the bass i want..?

 

i want to really feel my bass and have it be heard from a distants

umm can give most of my trunks space up for subs or like 2/3 of it

and around $500 preferred

 

how much did that set up cost

 

is a second battery nessasary for that hook up

 

or is it just a good thing to have
and then whats the big 3

 

so its a good idea to get a second battery
and if i am making my own box is it ok to make a holder on the box for the battery
and another thing i have a 1995 audi a6 and the battery is under the back seat so the big 3 might be hard to do is there any easy way to figure out what guage your wire is for your ground on your car right now

 

well yea but it might be hard to do it on my car cuz the battery is under the seat so how can i find out what guage wire i have in my car right now

and do you know of a really good sub and a amp for under $400 that pounds a lot....?