I second the 4 gauge wire. It will be all you need, especially if you don't plan on weighing down your car with lots of subs.
As far as sound deadening goes, it really just depends on how much you want to cover. You can do the floors, doors, headliner, and trunk if you so desire, but it does weight a considerable amount, so you probably wouldn't want to do that. Just put it in vital areas, such as behind the speakers. If you buy in bulk it is cheaper, but you may not need that much. I used 72 square feet for my 2 door blazer, and I still haven't done the headliner. I used Stinger Roadkill, which I recommend. It has worked well for me. A 36 square ft. bulk pack can be found on amazon for $100.
As far as the battery goes, you probably won't need anything too serious for the setup you described. Unless you plan to go a lot bigger down the road. And you could easily listen to music for 30 minutes on a good battery without worrying about it dying. I have a normal battery for my system and it has done fine. Unless you are planning on getting into some higher power stuff, I wouldn't worry about that right now. Just make sure your battery isn't old and worn out.
It sounds like you are looking to install a practical system that won't weigh your car down too much or cause much inconvenience.
I believe the best way you could go about doing this is to get a 4 channel amp and hook up 2 of the channels to your front speakers and bridge the other 2 to a subwoofer when you get one. Then when you want to get rear speakers just use the 4 channel amp for the 4 speakers and get a mono amp to drive the subwoofer.
The main advice I have is to have a goal for your system. Just take some time and ask yourself what you want out of the system. You have to figure out what you can sacrifice and what you cant. Then plan out the system you want (speakers, amps, subs, wiring, etc. - everything) and write it all down and stick to your plan. If you don't do this you will probably waste a lot of time and money.
As far as sound deadening goes, it really just depends on how much you want to cover. You can do the floors, doors, headliner, and trunk if you so desire, but it does weight a considerable amount, so you probably wouldn't want to do that. Just put it in vital areas, such as behind the speakers. If you buy in bulk it is cheaper, but you may not need that much. I used 72 square feet for my 2 door blazer, and I still haven't done the headliner. I used Stinger Roadkill, which I recommend. It has worked well for me. A 36 square ft. bulk pack can be found on amazon for $100.
As far as the battery goes, you probably won't need anything too serious for the setup you described. Unless you plan to go a lot bigger down the road. And you could easily listen to music for 30 minutes on a good battery without worrying about it dying. I have a normal battery for my system and it has done fine. Unless you are planning on getting into some higher power stuff, I wouldn't worry about that right now. Just make sure your battery isn't old and worn out.
It sounds like you are looking to install a practical system that won't weigh your car down too much or cause much inconvenience.
I believe the best way you could go about doing this is to get a 4 channel amp and hook up 2 of the channels to your front speakers and bridge the other 2 to a subwoofer when you get one. Then when you want to get rear speakers just use the 4 channel amp for the 4 speakers and get a mono amp to drive the subwoofer.
The main advice I have is to have a goal for your system. Just take some time and ask yourself what you want out of the system. You have to figure out what you can sacrifice and what you cant. Then plan out the system you want (speakers, amps, subs, wiring, etc. - everything) and write it all down and stick to your plan. If you don't do this you will probably waste a lot of time and money.
