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hmm i would say that the amp may not have turned on so could be low voltage coming from the battery you used. it may not have been high enough to trigger amp turn on, else the speaker line inputs didn't have the right voltage either.Question for the techie guys here.
I bench tested the Rockford PBR300X1 using speaker line inputs off my “home stereo” (just a small mini system..... took a speaker out from that stereo into the car amp.
I used my car battery as my 12V and tested 12v at the power terminals on the amp.
I was using theP3SD4-8 P3 Punch Shallow sub as my “sub”
The amp didn’t turn on when I had the input signal active. Even injecting 12v to the “remote” termail the amp barely had enough power to move the sub.
My question is, does the car stereo speaker line differ from the home stereo speaker line in anyway?
I no longer have this setup and didn’t get a chance to tap into the car’s factory speakers
it is very likely that the voltage of the speaker outputs from your home stereo that did not cause the amp to turn on since the amp was looking for that turn on signal from the speaker outs of the home stereo. if you swapped to "remote turn on" input but didn't change the jumper settings on the amp, then it wouldn't have turn the amp on either.
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