Originally Posted by 97teg
A second battery will do nothing if your drawing more then what the alternator can provide. Youll eventually still kill both batteries. It will just take longer.
If the amp will work or not will depend on the current draw at your normal listening levels. If its loud enough and only drawing a little bit then it will be fine. If your running it at full vol all the time it may pull enough to be a problem.
Thats why I said most people wire it wrong. If done correctly It is imposible to drain the front battery as its not powering the amps at all. The only power that would come off the front battery is the power to the head unit. Stringing two battery together in parllel bad plan, Isolating both battery's is the way to go thats why I said it cost more.
Tyler88 any more info on this sub just PM me.