Yes an amp will demand current, and lower the voltage gets, the more current the amp will draw.
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Is it possible for a person to get a battery to put out 13-14 volts while the car off
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Yes and no. Yes you can buy a device that will make sure your amps always get 14volts. No it cannot alter physics and it still draws power in at battery voltage. The difference is made up in the current it draws from the battery is higher than the current the amp draws from it. Trust me - you don't want it. Not only is it expensive (ie more than a new alternator and pair of Optimas) but it is bad news with respect to current draw.
As Veeman mentioned earlier, some people do run 14volt or 16volt setups but generally not on a street driven car. The alternator has to run about 2v above static battery voltage to charge it and most car electronics don't like that much voltage.
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Paul Niwranski
1966 Cadillac Superior Crown Royale Limousine Hearse
If you're mirrors ain't shakin...you got taken...
RIP Member #8
Be careful what you wish for...
