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MoparMadness
Dodge Dakota
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3/26/2004
10:23:59
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 Subject: RMS vs Dynamic
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On MTX's webiste that have power specs for RMS at 12.5 volts and Dynamic at 14.4 volts. I noticed that the power output was significantly less on the 12.5 power. I was wondering if you had to have a second battery to get the 14.4 volts or could a stock electrical system handle it. Also, if I got a second battery, would I also need to get a second alternator?
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DSW
Dodge Dakota
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3/26/2004
14:39:24
|  RE: RMS vs Dynamic
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Check out your voltage gauge with your truck running and shut off. Your battery alone will put out about 12.5 to 13 volts, but the charging system will put out over 14 volts. This just means that the amp will be louder if the truck's charging system is running, but then again your trying to overcome the noise of the truck's engine running so you won't notice that it's louder.
You don't need a second alternator for a second battery, but you will need a bigger alternator if you are pulling more current than the alternator can supply. A 1200W RMS amplifier can pull 100 amps of power, so if you have a 140A alternator you are only leaving 40A of power to run everything else in the car. I would suspect that todays cars with all the electronics and power everything can pull and easy 70-80 amps of power everything running, headlights turn and brake lights, AC or heater, wipers, engine electronics and ignition, stock stereo.
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Jim Z
GenI
3/26/2004
14:51:33
| RE: RMS vs Dynamic
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Message:
I was wondering if you had to have a second battery to get the 14.4 volts
A fully charged battery is 12.75 volts. Adding a second battery in parallel will give you 12.75 volts. So no.
or could a stock electrical system handle it
depends. The charging system will keep the electrical between 13.5-14.4 volts. It varies from vehicle to vehicle. The 14.4 volt amplifier ratings are a "best case" scenario and aren't terribly realistic.
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blue92
Dodge Dakota
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3/28/2004
20:01:15
| RE: RMS vs Dynamic
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Message:
You should buy an amp for its rms output and asume that's what you are getting and not dynamic or max output. In many case you will not be even getting rms #'s because when you crank it up the battery will dip below 12v. This is where capacitors and second batteries come into play, to keep it at 12v. There is a product made by jacobs electronics called the accuvolt that will provide a constant 14v or 16v depending on the model but will probably cost as much or more than your amp.
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