Car almost shutting off from bass...New alternator or more batts?

[Rodeo91 10+ year member]

OK I have a 1991 Isuzu Rodeo with 2 JBL bp1200.1's running at 1 ohm each. Last night I was showing a few friends and I turned it up past where I usually listen to it to show what it could really do, and my lights dimmed real bad and once I felt the car struggle to keep going so I immedietly turned it down.

I have an optima yellow top under the hood and the big 3 done in 0 gauge. My alternator is a 115 amp compared to the stock 80 amp. Am I going to have to fork over the cash for a new alt, or should I just add an extra battery or 2?

Keep in mind my car only does these things when I really let it rip showing friends or whatever it may be. It happens when the volume is way beyond causing pain so it's not like I ride around with it like this everyday. I almost feel like if I had these amps powering say like 1 12" sealed instead of my 2 15HC's ported my car wouldnt be doing this even with the same power. Anyway, what do you guys think is in order here?

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[Blados 10+ year member]

I wouldn't do anything. If you don't get bad dimming for daily driving, just leave it the way it is.

 

[lubetek 10+ year member]

I'd install another battery, and maybe even a bigger alt. Infact thats what i would do if money wasn't an issue.

 

[Chevyaudio 5,000+ posts]

2nd battery wont help much, sounds like a new alternator is needed...get something in excess of 200+ amps