going to get 3 12's in the back of the hatch in the dip and i need someone who can build me a box and a reccomendation on a amp and the wattage

 

There are a couple of us here that offer boxes. 3 12s can be a bit tricky because it's a very tight squeeze to get one in the center because of the hatch motor and the shape of the hump.

As for the amp, that totally depends on your needs, your budget, and the type of subs you've got.

 

3 12's will be very tight and the box will be undersized,

2 12's is about the most you'd be able to fit and have proper box sizing

 

i have a lot of ideas for the subs

im looking at 3 mega sound 12's from walmart. they have 300Watts peak a piece so i need some reccomendations looking to spend 150 altogether.

 

spend the money on 1 good sub or go for 2 JL 12W0's
they are cheap and they are a tried and tested sub

I think everybody and their has had those subs and you won't find 1 person thats not happy with them

I've personally moved on to the higher end stuff for my camaro but I still run 2 12" WO's in my Jimmy and the bass is insane

 

how much do they retail for

 

Well, he wants to spend 150 at most, and he can get 3 12's for obviously that or under.. That works out to... Dang.. I spent more on wiring... That should give you an idea.. I didn't know they MADE a 12 inch, 50 dollar sub, or that walmart sold subs...

 

I payed like $110 canadian brand new each sub

 

yea they do and i work automotive department and i get a discount on everything except food so thats why im getting all my stuff from walmart. im going to see how all my stuff turns out i got a couple ideas for some in car entertainment.

 

That stuff is garbage. I suggest the same as what these guys have already said. Put your money into less stuff of better quality. 3 junk subs won't sound good, and still won't get all that loud unless you're pushing them with a good amp. Stick with 1 $150 sub and not 3 $50 subs. You'll have much better sound quality, your output should be just as loud, and you'll have more installation flexibility.

 

ill see how it turns out and so now all im goin to do is try to find the right sub