1700 RMS do i need a HO alt?

[osamio]

I was set on thinking i'd just need another battery, and the AMI Customs called me a noob because i was worried about draining the battery without a high output alt:

Lemme get this straight, if i have a stock alt, but a high capacity deep cycle battery, The battery will handle the amount of current my sound system draws that the alternator can't handle right? Which brings me to this:

What happens when i drive say, 20 minutes, bumping the whole time? If the sound system is over-drawing the alternator, then the battery will not be charging, and when i shut the car off the battery will be too low to start the car?

And substitute any amount of time, i mean, let's say i drive an hour, then i could potentially kill the battery completely, and have to shut the system off to allow the alt to charge the battery before i shut the car off??

This is why people run battery banks. And yes you can do exactly what you are saying happens to a lot of people who have no idea what they are doing, we call those people....noobs....LOL

But apparently if it's not full blast 1700 watts the whole time, i should be fine, so i'm not really sure why he has such an issue...

[osamio]

One more thing, is it a bad idea to add an AGM batt to my stock batt? it'd be really easy, they're both in the trunk, I was thinking i might as well just leave them both in, or would that be bad if only one is deep cycle?