Big ?

depends on your vehicle.

 

i dont have one because of that and because i need to do mods to make it fit in my van and im too lazy to do it...lol

 

you have to check online to see if it fits if it doesnt you need to make mods

 

Region

 

there you go to the battery search and find your car

 

the height adaptors are for the engine bay...for the back you should use a deep cycle one and you shold put it in a battery enclosure

 

http://www.caraudiotalk.com/audio-forum/automotive-electrical/4028-adding-second-battery.html

you should read that if you are going to put a second batt

 

http://www.caraudiotalk.com/audio-forum/automotive-electrical/3987-big-3-a.html and this one too

 

in optima yes yellow

 

they should be simple because they go in the speaker wire

 

no problem

 

If you are having electrical problem with that amp that puts out around 300-400 REAL watts than upgrading your amp will only make the problem worse...I would highly recommend start looking for a new High Output Alternator if your car is having trouble keeping the battery charged with such a small amp as that.

Also this combo of subs and amps are total opposites....such quality subwoofers vs. such a cheap amp.

I would recommend that you sell those subs...you don't have the electrical or power to push those subs...they are just power hogs and don't use low power as effectively as other lower power subs. a 5000 watt sub just isn't going to be as efficient as a good 500 watt sub.

Spend the money that you make on selling the subs and amp to upgrade your electrical first....must have power to make power

 

what azn said is the truth.you first have to upgrade your elecrical system.even if its just a big 3.

adding second batts to an already weak set up will only make things worse.

do the big 3 first and see what happens.