Slight dimming on 2003 yukon denali

[denali804 10+ year member]

I have a 2003 yukon denali with 300 amp alternator, big 3 in 1/0, clean grounds and clean and tight connectors. I also have two 34/78 yellowtops mounted under hood. I have a soundstream xxx6500 (at 1 ohm) and a 600 watt 4 channel amp in the vehicle. This is not really a major problem im just looking for a little advice. When i pump the system pretty hard i get what I would call small dimming issues. This is more pronounced at idle then highway speeds because of alternator output. My question is this, do you guys feel that with this type of setup it would be normal to have some dimming or am i overlooking something. My metered voltage drop is very low back at the amps when playing. Thanks for any and all help provided.

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[mlstrass 5,000+ posts]

I have the same problem. 200a with a SVR 34/78 up front and BIG 3 in 1/0. I'm going to add a battery in the rear for the sub amp, so if it does the trick I'll let you know.