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    pilyin's Avatar
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    How much power do I need for 3 amps

    I'm looking to run a 300, 400 and 500 watt amps. I'm wondering if I'll need more power than just my car battery. The 300 would be powering one or 2 8's. The 400, 4 3.5's and the 500 a set of 6.5 components and maybe 2 4 x 10's (I'm not sure what I'm going to do with that slot). If I do need more power, how should I go about doing this?

    Also, would you prefer JL audio TR350-CXi's or Infinity Kappa 32.5CF's?







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    Re: How much power do I need for 3 amps

    how big is your alternator? (that sounds dirty)

    abe m.




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    Re: How much power do I need for 3 amps

    ok i figure to give you some leeway a safe leeway 65 amps actually amount is 57 from what i can gather. you will deff need a new alternator most likely, other can double check as i am not positice about it, but it would be wise to get a alrger alternator




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    Re: How much power do I need for 3 amps

    How large of an alternator and could any of you tell me how I could check this?




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    Re: How much power do I need for 3 amps

    What if I just ran 2 amps? An 800 (powering door and dash) and 300 (Powering 1 or 2 8 subs)?




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    Re: How much power do I need for 3 amps

    Those sound like they could be peak #'s. Can you give us brand and model of the amps you're considering? Year/make/model of car wouldn't hurt either.




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    Re: How much power do I need for 3 amps

    The 300 is a Rockford Fosgate Punch 300S. The other amp I'm looking at is not the 800 anymore but rather a Rockford Fosgate Punch 500X.

    The cars an 85 Pontiac Fiero.




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    Re: How much power do I need for 3 amps

    Assuming your car has air conditioning - the parts store websites say it's a 94A alt. That should be more than sufficient for those two amps.




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    Re: How much power do I need for 3 amps

    yeah if you get a bigger alt. you'll also lose horse power and fuel economy I would go with a 2nd car battery and a farad cap bigger alternator would be a last resort




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    Re: How much power do I need for 3 amps

    Quote Originally Posted by 91explorerV6
    yeah if you get a bigger alt. you'll also lose horse power and fuel economy I would go with a 2nd car battery and a farad cap bigger alternator would be a last resort
    Unless you're upgrading to a HUGE alternator there should be little to no effect on power/economy. 1 extra HP driving the alt pulley should net around 700w of available power.
    A 2nd battery will only improve car-off listening time.
    A cap will only result in lower over-all system voltage and MAYBE help reduce headlight dimming if you have it.




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    Re: How much power do I need for 3 amps

    hmmm... let's get this straigh....

    you're running 300 watts to two small subs, 400 watts to 4 3.5's and 500 watts to 6.5s and 4x10s.

    The least of your problems will be your electrical system. You're system's going to sound like crap. You're going to have 8 sets of full range speakers totaling 900 watts, and 300 watts to the most power hungry devices in the system...

    maybe it's time to rethink this.




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    Re: How much power do I need for 3 amps

    I have a Ford Ranger, and first upgraded to a one farad cap to fix the headlight diming (almost flashing) and that worked. When I upgraded my Amp to an 81000D (sub amp only) I found my truck would stall out when I was at idle with almost half bass (not cool). I asked around, and upgraded to a 200 watt alternator (peak, not RMS), and I've never had problems since. All my electronics are better, and my battery charges up faster. An alternator upgrade is by far the only way to go if your even questioning power issues. By the way, I also think you need to rethink your system. You'll never need all that power for your four ways. You'll want to run at least 500 watts to each sub alone, for good bass (I'm not crazy, that's not that much). Also, it's best to run your amps at lower capacity, i.e. buy bigger amps than you'll need, that way, you'll get better clarity with less distortion, and it will make your amp live it's life to the fullest. It sounds like your off to a good start though.




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    Re: How much power do I need for 3 amps

    I mentioned earlier that I was thinking of only using two amps now. Four of the speakers (3.5's) are in the headrest (2 in each headrest, they will be turned down quite a bit and I don't plan on using an amp on those anymore). Factory location. The two in the dash I'm going to try to build a plate to hold a 3.5 or 4 inch component set rather than 4 x 10's (because it seems that people think they sound like crap) and the door will be an infinity 6.5 component set. I intend to power the dash and door by a 500 watt amp. These are all 4 ohm speakers so they will actually be getting about 50 watts rms per speaker (total of 200 for the 4) so it's not 500 plus the headrest speakers. From what I've heard I'll probably go with an 800 watt amp if I'm using 2 subs.

    As far as I understand, my earlier idea wouldn't have been sending 900 watts to full range speakers. 4 x 3.5's = 160 + 4 x other speakers = 200 for a total of about 360 RMS. They're all 4 Ohm speakers.




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