Car Electronics Questions? Ask an Electronics Expert for Answers ASAP
The first thing to check are the speakers... What has happened to the amps?
When you switched from the 2000 watt to the 3000 watt did you change the speakers? Unless the speakers are rated to at least 10% more than the rating of the amp then there is a very real chance of the speakers overloading. When this happens the coils can burn out on the speakers and can fail into a short with the potential of blowing amp...
What are the make and model of the speakers?
The speakers need to be rated more than the amp and not the other way round... Its a distinct possibility you have blown the speakers into a short and that short has fried the amps... You will need a multimeter to test the speakers..
Did you have the speakers in series or parallel? If parallel this will have the effect of making the overloading worse... If in series then these speakers are right on the limit of the amp but the doubled impedance will have an effect on the Amp output
Did you need more help with this?