Power requirements


Alex Swedenburg
Unregistered guest
Okay guys thanks for all the help so far. Here's my current situation:

I have the Infinity Perfect 12.1 sub running off my Rockford Fosgate 500s amp, Cerwin-Vega front speakers and Audiobahn back speakers (both running off the HU at the moment.)

What I want to do is get a second Infinity, a kicker KX600.4 for the mains, and a Kicker KX800.4 for the subs. My question is, what kind of current will these amps be pulling? The KX600.4 will only be pulling half current at the most, since I will have 4 ohm speakers hooked up to it.

If it's too much, I think I will get a bigger alternator before the amps. Anyone know how to find out what size of alternator I have right now?


Gold Member
Username: Glasswolf

Post Number: 1405
Registered: 12-2003
they're class AB amps.
75x4 and 100x4 respectively.
take the RMS wattage for the load you'll present to them, and divide that by 12.
then add about 50% of that total again for inefficiency.
that's what the amplifiers will draw (in amperes)
you may want a class D amp for the subs. then the class D only adds an extra 20% over load for inefficiency. consider the KX600.1 or 1200.1

to find the stock alternator rating, call AutoZone or Advance auto parts and have them look up the stock replacement rating.
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