should i get a new battery if i am going to run two subs and a amp? i just bought a new battery. but its stock. or a little bigger than stock because i had to mod my battery hold down so it would fit. but i wanna put all new speakers in. and i have a sony XPLOD head unit. and i dont know to much about wattage.

 

I have a new head unit, new speakers, and amp and 1 12 inch sub with the stock battery, you should be fine

 

Depends on what kind of power your going to be needing. I have a Iraggi in my trail rig, powering 6 lights, 2 drivers(1400wrms at .6ohms), and some other nick nacks.

 

All batteries fully charged put out about 12.7 volts. only way to get more juice is adding a second battery. However, there is a 34 (~550 CA) series battery stock, a 24 series (~800, or 1150 CA for the marine version) and a 64 series (~750 CA) will fit, those 2 batteries have higher cranking amps, which will DO NOTHING but make the engine turn over faster, not make the speakers system better.

An amp multiples the 12V from the battery, thats it.

 

Agreed, the reason yellow tops are admired in the audio community is not for their power, but for their ability to drop way below 12volts and not have any damage done.