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dude its a 1200 watt amp do the big 3 youll be fine 12.3 isnt some kind of crazy drop buy a new battery if you really want but do the big 3 you shouldnt have much of an issue after that
Every car is different....My car couldn't handle ~1000 rms with big 3 done. The big 3 may solve his problems....
In my opinion, you should do the big 3 and see if it helps. If not, you'll probably just want to get a new alternator and agm batt and have a nice, beefy electrical...especially if you're wanting to upgrade in the future.