Question about Rockford Fosgate T20001 bd Car Audio Amplifier

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Is my alternator too small

My amp keep tripping out a high volume level 25.I own a 1990 Nissan 240SX with a T20001 amp pushing two T-2 subs and my alternator is only 80 amp. I have a 5 farad capacitor and a 100 farad dry cell battery

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If you're running the amp into a safe ohm load, it's likely that the amp is cutting out due to low voltage. You need to check the voltage with a multimeter connected directly across the terminals of the amp. If the voltage is dropping below ~10v, check the voltage across the main battery terminals. If the voltage is essentially the same at the amp and at the battery and it's dropping below ~10v, you need a larger alternator.

Posted on Sep 26, 2008

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ProSub 600 tripping off during playback of low bass and turns on after a while but works perfectly if volume is turned down. what could be the problem?



  • The DSW ProSub is a nice amplified sub. The reason it is shutting down is the amp is being worked to hard and it's going into thermal mode and after you turn down the volume and it cools down it's coming back on. To much of this and you will have a nice sub and no amp to run it.
  1. One thing to do is keep the sub/amp in a well ventilated are and put a fan on it if you can to help move the heat away from the unit.
  2. The amp is rated at 250 watts so if you push it to hard it's gonna keep shutting down. So turn it down a little so it runs longer and smoother or add another sub to the set up if you need it louder (like we all like). One sub can only do so much.
  3. Also make sure if the receiver your using has a base setting or an EQ that you keep them levels set a little lower. Most receivers and home theaters already have an amp in them and you don't want to run to much of that into another amp. It's over kill. Find that happy medium.

  • If you have any questions or comments please feel free to ask.
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Replace belts on a 92 nissan 240sx


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a possible explanation could be heating. the amp reaches its boiling point and cuts off. in this case, a fan may keep it from overheating. another option is a voultage problem, you may have to readjust the bias current. try measuring it if you know how). the amount of bias current depends on your output stage. something like: 20-50 mA for normal bipolar push pull probabely twice as much for darlington push pull and up to 250mA for MOS FET push pull.

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