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Not an expert on audio by any means, but you could be over taxing your alternator. Maybe one of the other people here with more experience can help. I had same tyoe of problem with some of my previous off road vehicles with may lights and accessories when I would turn them on, ended up having to get a heavy duty alternator.
 

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First off, if you aren't running an upgraded battery and no capacitor then you probably should be...you alternator should be fine but the long loud basehits for a long period of time is killing your battery without a capacitor. The subs are drawing too much power at a time for your battery to handle so I would suggest either a better battery or get a capacitor.
 

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I have this happen but only when i max out my system when the car is off. That was on my civic though (smaller battery). Your system is just taking too much power from the battery, and something is shutting the system off as a precaution, instead of killing your car. Get a decent sized cap and you will be fine because the battery will get drained at a constant rate instead of drawing large loads all at once, causing the system to shut off. I dont know if you can justify buying a bigger battery for the size system you have though. Any bigger and I would say yes do both but you should be okay with a big capacitor.
 

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eh...idk bout that Bboy. i was running my 1000watt system w/out a cap for the longest time and just had really bad headlight dim. OP-when you say the bass cuts out does it blow fuses?
 

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eh...idk bout that Bboy. i was running my 1000watt system w/out a cap for the longest time and just had really bad headlight dim. OP-when you say the bass cuts out does it blow fuses?
ya, ou can run the system, but once you turn it up to a certain level of loudness the car will have to shut off. Only thing is I had a capacitor when this was happening AND my car was off, not running. so could have been capacitor protection function, or an internal amp protection function, or just the type of car itself that caused it to shut off due to massive power demand.
 

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you probly just need a better ground unless your running good stuff kicker, JL, audiobahn, stuff like that...if its just cheaper walmart stuff you should be good. if its powerful you probly need to upgrade your wiring
 

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ya, ou can run the system, but once you turn it up to a certain level of loudness the car will have to shut off. Only thing is I had a capacitor when this was happening AND my car was off, not running. so could have been capacitor protection function, or an internal amp protection function, or just the type of car itself that caused it to shut off due to massive power demand.
my bad. i failed at reading your previous post completely. i didnt see that the car was off. yeah the cap probably shut off or something for you. but in OP's case, if his car is running and his subs just quit working he maybe have his amp overloaded or the amp could be over heating. he still hasnt really given us any details as if he's blowing fuses or how long he likes to run it all the way up
 

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you need to add a relay before the capacitor
 
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