Thread: Advice Needed: Volt difference
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Old 04-14-2016, 05:14 PM   Thread Starter #13
CammusThread Starter
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Default Re: Volt difference

Originally Posted by Avguytx View Post
What size fuses are on the amplifier? That will show you how much extra amperage is needed from the alternator to produce the wattage you need. It may be "just 900 watts" but it's current being drawn that wasn't originally intended to be drawn.

Ohms law... Total power / Supply voltage = Current (inefficiency of amp not taken into consideration)

900 watts / 13.4v = 67.4 amps of "extra current" being drawn from your cars charging system that wasn't originally factored in. You're going to have voltage drop, etc., without a beefier system. It's just part of it.

Is that 900 watts RMS or peak/max? Can't find any kind of manual on that series.

No clue what "Big 3" means. Alternator, battery, cap?
First of all, thanks for your response Avguytx.


Yes, 900 watts RMS
DB Drive Speed Series
SPA 900.1
Power Output RMS @4ohms 450x1
Power Output RMS @2ohms 900x1
Class D
Fuse 2x 30 amps

What Big 3 means is that you add/replace 3 cables on your electrical system.
1 from the alternator to the + of the battery
1 from the engine block to chassis
1 from - on the battery to chassis

And you use 4/0 gauge wire so the current flows with less restriction.

https://www.youtube.com/watch?v=gnmXKjm3tZE
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