voltage problem cause this???
Ok, heres the story...Yesterday I'm installing an amp in my friends truck. His battery terminals were rather corroded and his battery was leaking some acid. When I went to unbolt the wires from the pos. terminal to connect the power wire for the amp, the whole terminal popped out of the battery. The battery was junk. Instead of going to get a new battery from autozone, my friends dad goes back to his house to pick up a battery that has been sitting on his porch for about a year now. He throws it on the battery charger for about 10 mins and comes back over to my house. We put the battery in, it has enough voltage to crank the truck. I go ahead connect the power wires, make a good ground, run the RCA's put the speaker box in, connect the speaker wires. I turn it all on, amp powers up fine, speaker vibrates on bass notes, I begin adjusting the gains. As I turn the gains up the speaker doesn't really get any louder, the engine sounds like it is about to stop running the higher the gain goes up. The speaker vibrates to the music but the cone isn't moving in and out hardly at all. Is this a voltage problem and therefore the amp isn't making enough power to move the woofer? On a bass sweep from 100hz-20hz with the gain cranked about halfway and the volume on 35/50, I clearly hear the engine sound like it is cutting out and about to die. I believe this battery the guy used didn't have enough voltage to run everything(it was much smaller than the factory battery and probably not even charged up all the way). Is voltage/battery my problem or is there a problem elsewhere? It seems to me that voltage can be the only thing to make it do that but I wanted to check with you guys. The cone on the speaker in the center got really hot even though the speaker wasn't even doing much...I disconnected the amp, pulled the inline fuse and left it all disconnected. I plan to tell the guy he needs a new battery and when he gets that we'll try again. Let me know what you think. Thanks guys.
Dad, Electrical Engineer, MBA
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