Join Date: Dec 2004
Location: Santa Barbara, CA
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I'm working on upgrading the stereo in my 1987 325, and want to know whether I'm going to overload the alternator. If all goes well, I plan to be running:
-1x Audiobahn 600W RMS Amp powering two Alpine 10" subs
-1x Audiobahn 400W RMS Amp powering two Alpine 6"x9" rear speakers
-1x Pioneer head unit, rated to ouput 22W x 4 RMS
I don't fully understand Ohms (and Ohm's law), but from what I've been reading, I should set up the 6x9s to draw 100W each at 4ohms. Does this still mean that the amp will be drawing 400W?
From the manual, my alternator ouputs 80 Amperes at 14 Volts, for a total of 1120 Watts. My air conditioner does not work, and my headlights are original (although I don't know how much current they draw). Am I correct in thinking that if my system isn't running at full volume all of the time, I should be safe with my current alternator? If it matters, my starter is brand new, but I don't know how much power it draws.
Thanks for any advice,
My 1987 325 is no longer. Rain and an relatively inexperienced driver are not a good combination, to say the least. Luckily no one was seriously injured.