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Reload Thread: 4 ch amp that puts out its power at a LOW INPUT VOLTAGE..?

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    4 ch amp that puts out its power at a LOW INPUT VOLTAGE..?

    What are some good amps for highs/mids that get their power at a low input voltage..I will be getting another amp with subs so im trying to get an amp with a good watts/voltage ratio.


    Chris







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    battery/alt




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    Re: 4 ch amp that puts out its power at a LOW INPUT VOLTAGE..?

    Originally posted by jcavz24x
    What are some good amps for highs/mids that get their power at a low input voltage..I will be getting another amp with subs so im trying to get an amp with a good watts/voltage ratio.


    Chris
    There is a very destructive cyclical pattern to using regulated supplies and having a weak charging system. The amp will demand more current at lower voltages, making it harder on your car when it is at its weakest. You may want to consider beefing up your charging system soon.




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    so does this mean i should not go with a US acoustics amp..it is rated at 12.9 volts.
    Like i said..i will have another amp for sub(s).

    is it worth it to get a Cap that is like 15 farad if i dont want to upgrade alt and battery or will it not do anything for me?


    Chris




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    12.9 volts is the normal running voltage of your car turned on. 14.4 is the theoretical maximum your car can produce. there is nothing wrong w/ buying an amp designed for 12.9 volts b/c 99.9% of them are. if you car is producing less than 12 volts then you have some electrical problems you should fix before beefing up your audio system.

    PS - dont waste your money on a cap, especially not a 15 farad one.



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    Originally posted by rco8786
    12.9 volts is the normal running voltage of your car turned on. 14.4 is the theoretical maximum your car can produce. there is nothing wrong w/ buying an amp designed for 12.9 volts b/c 99.9% of them are. if you car is producing less than 12 volts then you have some electrical problems you should fix before beefing up your audio system.

    PS - dont waste your money on a cap, especially not a 15 farad one.
    is that right, the whole normal running voltage thing, because i can see my cap in my rearwiew mirror and when it's running, it's almost always at 14.2-14.4, it's never at 12.9




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    12.9 might be normal for some cars (probably with old batteries), but mid 13's is average. Strong battery might get you around 14, a weak one will get you well down into the 12's. It varies. 14.2 is way on the high side.

    Any decent amp should be fine at anything 13 or more.

    My amps have less than 3% output change from 14v to 12.8v input voltage -- Stiffly regulated.
    Last edited by n2audio; 12-19-2002 at 01:06 PM.




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    ok then, i don't know what's up, but the voltmeter on my cap is always at least 14, usually 14.2-14.4, and i've seen as high as 14.6. if i were to get a new battery, would that possibly change? we celebrated christmas last sunday because we're leaving for florida this saturday, and one of the things i got was an optima yellow top(actually it's still at sears) but anyways, when i get it and put it in, is there a possibility that the voltage would be lowered at all?




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    Can't say for sure. Theoretically, if anything, the voltage will improve. Check it out and see. With the voltage you're getting right now I would say the only gain you can hope for with the optima is a little engine-off listening time.

    On a side note...I know nothing about caps, but I'd be leary of the voltage meter on it. The selling point of them is that they boost your voltage when blah blah blah. I'd like to stick a voltage meter on your set up to see if it agrees with your cap. 14v?? Maybe. 14.4-14.6? Sounds awfully high to me. I think alternators have regulators on them that don't allow anything more than 14.4v output.

    As a matter of fact...You ought to pick up a voltage meter if you don't have one (cheap digital multimeters are about $20 at a hardware store). Check your voltage before you put in the new battery. Check it at the battery, and at the amp terminals with the car on, and with the car off, and with the system on and off (pretty loud). See if it agrees with your cap. Then put in the batt. and check it again. I'd be curious to see the results.




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    my dads got an expensive one or three, i'll use one of those when i get the bat, like i said, it's still at sears, we gotta order it, then go pick it up




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    My dads cadillac has a driver info. display down by the ashtray and when its running it reads 14.3 volts and i've seen it go up to14.8 before so it ranges. Even when the ar is turned off it reads 13 volts.



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    We trust them cuz with all the computers that thing has in it,(I took the glove box out one day to fix the radio, and it had three computer boxes uner the glove box ),it has to be a little accurate plus the outside temp. readout is allways right with our banks readout plus this guy that my dad knows (they are best friends) went to a Cadillac dealership mechanics school for 4 years and said that they are allways very accurate.



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    Originally posted by Jmac
    I only trust a multimeter that reads a 1.5 volt AA battery as 1.5 volts
    lol ok have it your way:p



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    Originally posted by n2audio
    12.9 might be normal for some cars (probably with old batteries), but mid 13's is average. Strong battery might get you around 14, a weak one will get you well down into the 12's. It varies. 14.2 is way on the high side.

    Any decent amp should be fine at anything 13 or more.

    My amps have less than 3% output change from 14v to 12.8v input voltage -- Stiffly regulated.
    A strong battery will rest at 12.6, but will not help you get any higher than that.

    A healthy charging system will reside at 14.2-14.6, and not dip into 13v very frequently. In no way is 14.2 on the high side of a vehicle at all, it is normal operating voltage.




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    so my putting in the new optima yellow top shouldn't affect the voltage at all?




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