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Old 10-19-2017, 01:34 PM
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hello all, i have a sundown audio saz 4500 and two zv3 18's dual 2ohm wired at 2ohm till my electrical is right. Anyway i have a 250amp alt 180amp at idle, a small agm (55ah) under the hood, dual runs of 2/0 ofc. sundown says the amp runs 2000rms at 2ohm loads which if I'm correct should be around 200amps draw. Just had the alt load tested and is working great. Battery is new. Yet my voltage drops SIGNIFICANTLY when the bass hits. Any ideas? is the sundown actually throwing more power and drawing more amps? My first sundown setup so i don't know a lot about them

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et my voltage drops SIGNIFICANTLY and immediatly when the bass hits. Just had the alt load tested for output and is working properly.
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Old 10-19-2017, 01:54 PM
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You're probably drawing more amperage then you think. And if you don't have a reserve it's not gonna help with voltage drop. And alt works on loads so it might not be quick enough to output full amperage at idle or higher rpm. So I'd imagine you drop instantly to 12.6v then below for longer bass notes. Try backing off the gain to help until you get more battery reserve and I'd recommend lithium battery as they will charge up to alternator voltage and works it way down while playing and idling with the alt. And unlike battery lithium battery and ultracaps will put a load on the alt til it's charged up to alt voltage which is nice cause you will have a continuous load on the alt which some say is bad. Maybe in the long run but did so for 3yr and no issue
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